Good morning, and thank you for holding. Welcome to Aon plc's first quarter 2021 conference call. At this time, all parties will be in a listen-only mode until the question- and- answer portion of today's call. I would also like to remind all parties that this call is being recorded. If anyone has an objection, you may disconnect your line at this time. It is important to note that some of the comments in today's call may constitute certain statements that are forward-looking in nature, as defined by the Private Securities Litigation Reform Act of 1995. Such statements are subject to certain risks and uncertainties and could cause actual results to differ materially from historical results or those anticipated. Information concerning risk factors that could cause such differences are described in the press release covering our first quarter 2021 results, as well as having been posted on our website. Now it is my pleasure to turn the call over to Greg Case, CEO of Aon plc. Thank you, operator, and good morning, everyone. Welcome to our first quarter 2021 conference call. I'm joined by Christa Davies, our CFO, and Eric Andersen, our President. As in previous quarters, we posted a detailed financial presentation on our website. I'd like to start by acknowledging the tremendous work of our colleagues across the firm. Our team continues to find ways to get back not just to normal, but even better than before. As we like to call it, the new better. The idea of the new better started in the second half of last year with a series of regional and local client coalitions. There are now 10 coalitions of leading companies around the world that we formed to explore the societal and economic implications of the pandemic. The group rejects the idea of accepting a suboptimal new normal and is working to define new better. The work is ongoing and continues to offer meaningful insights into how leading organizations will work, travel, and convene in the year ahead. We're translating those insights into new solutions that are designated and designed to accelerate recovery from COVID-19. For instance, we know that widespread global vaccine distribution is a key part of the solution, and one that Aon is enabling. Let me describe. Recognizing limitations with current supply chain solutions, Aon colleagues from Commercial Risk, Reinsurance, and Health Solutions collaborated with insurance, reinsurance, insurtech, and supply chain industry partners to develop a groundbreaking solution that uses sensors and analytics in the transportation and storage of vaccines. The sensors provide transparent real-time data and alerts if the temperature of a vaccine shipment falls outside the manufacturer's range, potentially allowing for mitigation efforts and helping to maximize the number of doses administered to the public. It's just another example of how we're creating innovative solutions that move our team and society forward. We're also donating all 2021 revenue from the solution to an international organization working to help end the human and economic toll caused by the pandemic. Turning now to financials. Our global team delivered outstanding results across each of our key financial metrics, including 6% organic revenue growth, a very strong start to the year on top of 5% organic in Q1 2020, substantial operating margin expansion of 170 basis points, 16% EPS growth, and 91% free cash flow growth. Within organic revenue, we continue to see strength in our core, driven by strong retention and net new business generation, and overall growth within more discretionary areas of revenue, with some areas coming back faster than others. Commercial Risk delivered 9% organic, an outstanding result with very strong new business growth and growth in project-related work and double-digit growth in transaction liability. Reinsurance delivered 6% growth, with strong net new business in treaty and double-digit growth in facultative placements. Retirement Solutions delivered 5% growth, and I would highlight strength in core retirement and double-digit growth in human capital. Health Solutions growth of 4% was driven by strength in the core, offset by pressure in project work, one of the areas we're seeing a little slower bounce back. Data & Analytics continue to see pressure from the travel and events practice globally, resulting in a 2% organic decline, though against the prior Q1 quarter pre-pandemic results. These results are an improvement from our Q4 earnings call outlook. During the quarter, we saw better-than-expected macroeconomic growth, which positively impacted client buying behavior. Looking forward, if macroeconomic conditions continue to be strong, we would expect mid-single- digit or greater organic revenue growth for the full year 2021. While our Q1 results demonstrate that our Aon United strategy is driving innovative solutions that address our clients' biggest challenges, we keep seeing signs that we must move faster. We see our clients justifiably focused on the economic impact of COVID-19, they're also increasingly focused on other challenges like climate change, supply chain disruption, reimagining and reconfiguring how and where work gets done, the growing health-wealth gap, and cyber. Our recent cyber risk report highlighted findings from our proprietary Cyber Quotient Evaluation, a comprehensive assessment of cyber risk maturity. The 2020 data tells us that organizations across regions and industries are only maintaining a basic level of cyber readiness. Specifically, only two in five organizations report they're prepared to navigate new exposures, and only 17% report having adequate application security measures in place. In our recent Grey Swan report, we looked back at 40 years of corporate crises, analyzing 300 examples that show the significant impact on shareholder value due to lack of preparedness. The total impact represents $1.2 trillion in destroyed value, and in 10% of the events, 50% of shareholder value was lost. These risks and challenges are exactly what we want to help our clients assess and prepare for. In another great example, our human capital and Commercial Risk teams realized that their client in the life sciences med tech space had not done an assessment or quantification of cyber risk for their business or products. Our team analyzed risks across infrastructure, technology, vendor, and digitally enabled products and quantified potential losses or impacts as reputation, business interruption, or a hack to their devices. In response to this prioritized and quantified risk assessment, our clients strengthened their own security measures and changed their insurance coverage, increasing their preparedness and reducing potential future volatility to their business, a topic that's more critical than ever for companies in the life sciences industry. Looking forward, this is a process and a solution offering that makes innovative cyber solutions more accessible to our clients in the life sciences space. As we look to our pending combination with Willis Towers Watson, we're confident their insights and capabilities will be a compelling catalyst to this work. This is just one example out of thousands where we see the potential for the pending combination of Aon and Willis Towers Watson teams to drive innovation based on forward-looking analytics and insight. As we've brought together the executive committee that will be in place after the close of the combination, the potential is clearer than ever. We have an opportunity to be more relevant to clients at a time when they need us most. Another example, our Aon team is currently advising a client on the integration of their largest transaction to date, a complex global merger that's moving very quickly. Colleagues from data analytics, retirement, health and benefits, and human capital came together to advise our client on harmonizing their people programs while balancing synergies and deal objectives to drive employee engagement and retention, as well as a shared vision from day one. Our client is relying on Aon to help them protect their greatest asset, their people. We know that the combination with Willis Towers Watson will enable us to bring together our combined capabilities, and that each company's client insight around health, retirement, and engagement will improve and accelerate our ability to deliver projects like these for clients. In summary, our first quarter results demonstrate the continued success of our strategy and position us with momentum to drive improvement on our key metrics over the course of the year, building on the track record of progress that we've delivered over the past decade. The events of 2021 continue to highlight unmet need and growing demand from clients around their biggest challenges, which we know are best addressed by our one firm and United strategy. Our ability to address client need and accelerate innovation will only get better in our pending combination with Willis Towers Watson, which continues to increase our commitment and excitement for the potential of the combined firm. Now I'd like to turn the call over to Christa for her thoughts on our financials and long-term outlook for continued shareholder value creation. Christa? Thanks so much, Greg. Good morning, everyone. As Greg mentioned, we delivered a strong operational and financial performance in the first quarter to start the year, highlighted by 6% organic revenue growth that translated into double-digit growth in operating income, earnings per share, and free cash flow. Our Aon United strategy has enabled continued growth across our key financial metrics. We look forward to building on this momentum through the rest of 2021 and in our pending combination with Willis Towers Watson. As I further reflect on the quarter, we delivered organic revenue growth of 6%, driven by ongoing strength in our core business with an uneven recovery in our more discretionary areas. I would also note that total reported revenue is up 10%, including the favorable impact from changes in FX, primarily driven by a weaker U.S. dollar versus the euro. Second, we delivered strong operational improvement with operating income growth of 15% and operating margin expansion of 170 basis points to 37.4%. Stepping back, our goal is to build a sustainable operating margin expansion over the course of a full year, as there can be volatility quarter to quarter given the seasonality of our business and timing of expenses, including long-term investment and growth. In Q1, margin expansion was helped by two factors. First, organic revenue growth exceeded our Q4 outlook due to the impact of macroeconomic factors and client buying behavior. Second, Q1 2020 had higher expenses in areas like T&E and investments in the business, which made for an easier comparable when compared to our expectations for the rest of 2021. Looking to the rest of 2021, we anticipate investment in the business and some potential resumption of T&E later in the year. Looking forward to quarterly patterning of expenses for the balance of 2021. As we described last year, we reduced certain discretionary expenses at the onset of the pandemic, given the significant macroeconomic uncertainty, and then returned to somewhat more normalized levels of spend in the back half of the year as macroeconomic conditions improved and the outlook stabilized. In 2021 compared to 2020, we expect approximately $200 million less expense to be recognized in the fourth quarter, offset by approximately $135 million more expense in Q2 and $65 million more expense in Q3. Put another way, we expect $135 million of expense to move from Q4 to Q2 and $65 million of expense to move from Q4 to Q3 when comparing to our expectations for the remainder of 2021 to prior year results prior to any growth occurring. This shift, representing about 2% of our annual cost base, is primarily due to the actions we took and highlighted last year, including the reduction of certain discretionary expenses, including variable compensation in Q2 and Q3 of 2020. This shift also spreads our expense base more evenly across quarters, though we still do expect the occasional variability and lumpiness in expenses. This change will have an impact on quarterly margins, reducing margins in Q2 and Q3 and increasing them in Q4. However, it does not change our expectation of full- year margin expansion for 2020, 2021. As we stated previously, our goal is to deliver sustainable margin expansion over the course of each full year, driven by accelerating revenue growth, portfolio mix shift to higher growth, higher- margin businesses, and leverage from Aon Business Services. Aon Business Services is focused on innovation as well as effectiveness. Recently, our Aon Business Services team saw an opportunity to improve premium accounting with a blockchain solution. The team worked with a carrier partner and the insurance industry standard-setting group to design and develop a clearing house for premium transactions. This process has been live since the 1st of January 2021 and has over 13,000 transactions executed. It's already improving the speed at which errors are identified and resolved. Over time, we expect our major carrier partners and other brokers to join the platform. We see this as a significant opportunity to improve the client experience with higher quality and reduce inefficiencies across the industry. As with other Aon Business Services process improvements, efficiencies in this new blockchain process enable our colleagues to spend more time with clients and on higher- value- added activities. Turning back to the results for the quarter. We translated strong operational performance into EPS growth of 16%. As noted in our earnings material, FX translation was a favorable impact of approximately $0.18 in the quarter. If currency remains stable at today's rates, we would expect a $0.04 per share favorable impact in Q2, a $0.02 per share favorable impact in Q3, and a $0.01 per share favorable impact in Q4. Moving to cash and capital allocation. Free cash flow increased 91% to $532 million, primarily driven by strong operational improvement, a decrease in the restructuring cash outlays, and a decrease in CapEx. I would note that we do expect CapEx for the full year to increase modestly as we invest in technology to drive business growth. Looking forward, we expect to drive free cash flow growth over the long term, building on our 10-year track record of 14% CAGR growth in free cash flow, including 64% growth to $2.6 billion free cash flow in 2020. We remain incredibly excited for the long-term cash flow potential of the pending combination. We make capital allocation decisions based on our ROIC framework, highlighted by $50 million of share repurchase in the first quarter. As a reminder, Q1 is our seasonally smallest quarter for free cash flow, due primarily to incentive compensation payments. We also repaid $400 million of term debt in February. Looking forward, we expect to remain highly focused on closing and then successfully integrating our combination with Willis Towers Watson. Following that, we expect to continue to invest organically and inorganically in innovative content and capabilities in priority areas to service our clients' unmet needs. We remain very confident in the strength of our balance sheet and manage liquidity risk through a well-laddered debt maturity profile. In the near term, we expect to continue to manage our leverage ratios conservatively and return to our past practice of growing debt as EBITDA grows over the long term. As I look towards our pending combination with Willis Towers Watson, we remain incredibly excited about the potential for growth in innovative solutions for clients and the shareholder value creation opportunity. We are continuing to work collaboratively with the appropriate regulators to gain approvals, and we've offered remedies. We continue to anticipate $800 million of cost synergies taking into account the remedies offered. We would expect to allocate any divesture proceeds according to our ROIC framework, in which share buyback continues to be our highest return investment. We are working towards a close in the first half of 2021, subject to regulatory approval. In summary, our first quarter results reflect continued progress, building on a decade of momentum driven by our Aon United strategy and underpinned by our Aon Business Services operational platform. We remain incredibly excited about closing our pending combination and beginning the integration process with Willis Towers Watson, which will continue to enable long-term shareholder value creation. With that, I'll turn the call back over to the operator, and we'd be delighted to take your questions. Thank you. We'll now begin our question- and- answer session. If you would like to ask a question over the phone, please press star one. If you need to withdraw your question, please press star two. One moment as we wait for the first question. Okay, our first question comes from Suneet Kamath from Citi. Your line is now open. Thanks, good morning. Last year, you guys pulled your guidance for the merger when you pulled your Aon standalone guidance. Now that you've reestablished guidance on a standalone basis, can you provide some thoughts on your expectations for guidance for the merger? Suneet, appreciate it. As we've said before, when we got together as the pandemic ensued, we pulled guidance overall. What we said today is, as we think about Aon, obviously we're talking about single digit or greater assuming macroeconomic conditions continue. I remind everybody that before pandemic, we talked about a combined mid-single digit or greater. What we plan to do, Suneet, is as we complete the combination, we'll obviously be back to you with what we expect going forward. Remember where we were when we started the process. Okay. Just focusing on the expense guidance, I guess, for Aon on a standalone basis. Christa, I think you called out a couple of things that are moving from quarter to quarter, is there an assumed underlying kind of growth rate in expenses as we think about 2021 versus last year? If so, can you kind of give us a sense of what that growth rate is? Suneet, this is a great question, and thank you for asking. What you're really seeing is just $200 million come out of Q4. Of that, $135 million goes into Q2, and $65 million goes into Q3. Suneet, that is before growth. You should assume growth is built on top of that, and we haven't given that growth rate. What I would say is it's in the context of full- year margin expansion for 2021 on top of a track record, as you know, Suneet, over the last 10 years of 890 basis points over the last 10 years. Approximately 90 basis points a year. Got it. Just the last one for me is on the free cash flow. As you mentioned, 1Q is typically your lowest quarter, the growth was quite strong this quarter. Was there anything sort of unusual from a timing perspective that maybe something was pulled forward in 1Q, just want to get some color on that? Yeah, we do expect to drive free cash flow growth annually over the long term, building on our track record of 14% CAGR over the last 10 years. I think Q1 free cash flow was exceptionally strong, driven by operating income growth, very strong operating income growth in the quarter. Given our pending combination with Willis Towers Watson, and especially the impacts to free cash flow relating to achieving the $800 million of cost synergies, we're not providing standalone guidance for Aon at this time. We do remain incredibly excited for the long-term cash flow potential of the pending combination. Okay, thanks. Thank you. Our next question comes from Elyse Greenspan from Wells Fargo. Hi, thanks. Good morning. My first question, I just want to make sure I understood correctly. You essentially said that the $800 million of expense saves for the deal, you're reaffirming that even with some remedies or divestitures, I guess, that have been offered up to regulators. Is that what you said, Christa? That is correct, Elyse. Okay, great. My second question. I am not sure how much detail you guys want to go into. We obviously read in the press in terms of what divestitures might have been offered up. I know there was a $1.8 billion kind of divestiture cap included within the merger. Is there any way that you could speak to that and give us a sense of whether you would be willing to go a certain amount above that level or any color you can give us in reference to that $1.8 billion that was laid out with the merger? Elyse, we're not going to speculate on remedies. We have confirmed that we've offered remedies. We're continuing to work collaboratively with regulators. We continue to anticipate, as I mentioned, the $800 million of cost synergies considering the remedies offered. We'd expect to allocate any divestiture proceeds according to our ROIC framework, in which share buyback continues to be our highest return activity. Okay. On the tax rate, I was interested in how your tax rate was impacted by GILTI and BEAT the last couple of years. Also on the tax side, would doubling the GILTI as Biden has proposed, have a tangible impact on your tax rate, all else equal? Elyse, we're not giving tax guidance going forward, but I would say as we look back historically, exclusive of the impact of discrete items, which can be positive or negative in any quarter, our historical underlying rate over the last four years has been 18%. Okay. One last one. You guys had said that Q1 had a tough comp, obviously the macroeconomic environment improved. It helped you get to the 6% for the quarter. When we think about the mid-single- digit organic outlook or greater, does it feel like to you that forward three quarters, assuming the economy continues to improve, should be greater than the Q1, given that we would get the better economy impacting organic as we go through the year? Yeah, all we're really highlighting, Elyse, is as you go back really Q1 last year was just really pre-pandemic. There really wasn't a lot of pandemic embedded in it. We were just observing 6% against that is a great start to the year. It just really underscores the momentum we have. We're obviously not going to give guidance other than the mid-single digit as we proceed through the year, assuming macroeconomic conditions continue to trend in the right direction. We would just observe, listen, Commercial Risk at 9% organic and Reinsurance at 6% and Retirement at 5% and Health at 4% is a really strong start to the year with momentum. The Data & Analytics piece Christa and I described before obviously is against a pre-pandemic quarter with some pressure around travel and events. That's going to come back very strongly when it does. Macroeconomic conditions hold, we're comfortable with mid-single digit or greater. Great. Thanks for the color. Thank you. Our next question comes from Jimmy Bhullar from JPMorgan. Your line is now open. Hi, good morning. First, I just had a question on your overall view of the potential accretion from the Willis deal. I think when you've previously talked publicly, you've assumed no dispositions, obviously you're going to have to do some dispositions, your $800 million target seems unchanged on expense savings. How do you think about the overall accretion from the deal? Do you think you'll still be able to hit your previous assumptions given that you'll be able to do something with the proceeds from the business dispositions? Or do you think there is downside to the initial numbers? Jimmy, what we would say is, we're not providing updated guidance at this time. Once we've closed, we'll certainly look forward to updating it. What we will say is that the $800 million remains regardless of remedies. We would note that when we originally gave the $800 million of guidance on expense savings, that was on an EPS base that was going to grow. It was pre-pandemic. The math, obviously $800 million of expenses on a smaller base is still a very positive outcome. The last thing I'd say is clearly, none of that math assumed any upside in terms of revenue growth and meeting unmet needs for clients, which is really the entire strategic rationale for the transaction. Greg, perhaps you want to talk about this. Jimmy, to take a step back and think about where we were really a little over a year ago, March 2020, as we announced the combination. We described, by the way, an opportunity that was grounded with the $800 million, as Christa just described, but really was about opportunity. Opportunity for clients, opportunity for colleagues. Obviously, having delivered that opportunity for shareholders. We described that literally, if you think about that opportunity, the next five years from our standpoint, from a value creation standpoint, we think is as strong as we've ever seen anyway in our 10+ years. That includes 10 years of circa almost 1,200 basis points improvement on return on invested capital and close to 1,600 basis points improvement on free cash flow margin. From a real shareholder value standpoint a year ago, we're just really excited about this. I would tell you over the course of the year, having spent time with Willis Towers Watson colleagues, that conviction has only grown. Everything you see, and we've talked about externally, as Christa described very well, doesn't include how we're thinking about accelerating innovation. There's a lot that's gone on as we've begun the integration in terms of how this plays out that really has been really exciting. The momentum that's building around this with our colleagues is quite high and we're just looking forward to all aspects, client, colleagues, and shareholder impact. Maybe one either for Greg or for Eric. Can you talk about, it seems like your comments on pricing are a little bit subdued or less upbeat than some of the underwriters, what you're seeing in terms of pricing change in Commercial and then Reinsurance as well? Sure. Greg, maybe I'll take that, but before I do, if I can make a comment on your earlier question, just on the excitement around the combination of what we're starting to see maybe a level lower. Certainly, the teams have been working on integration from a client experience and a revenue standpoint, culture, innovation, all those things. We're really beginning to see the possibilities as we go deeper into the organization around the planning process, whether it's things like on the risk side, the cat modeling and securitization experience that Aon has, the Willis' climate capabilities and their Resilience Hub, and their Acclimatise. Those types of things, when you put them together, really do provide excitement for our teams to see what's possible. There's a lot of those things that we're identifying as we go through the process, and it's really building some excitement across both organizations as they really begin to see the value they can unlock for clients. Now maybe to hit your question on pricing. I would say this, the dynamic of the pricing, as we say, it's moderately positive. It's never a straightforward answer, right? I'll give you some context as to why. We engage these clients in a couple of steps before you ever get to the marketplace, right? We do the risk analysis and identification. We work with them on mitigating strategies so that they don't even transfer the risk, how they can finance it among themselves. Ultimately, if they do decide to make the transfer to a third party, they're coming at this marketplace with their own risk appetite, their own budget capacity, the options in the market. We're using our capability to help them make the trade-offs. Ultimately, each product, there is no marketplace, right? I always get a kick out of when people talk about the broader market. It's a series of micro markets. Each product has its own dynamics, its own claim trends, terms, conditions, retentions, claims, supply, demand, all of that. Whether you're talking property, D&O, marine, it's a variety of different things. Ultimately, our role in this is to help clients evaluate how to manage the risk, make the right choices that they can make. As we see it's moderate. It's moderately positive, as we say, but ultimately, clients make choices in every market that help them meet their own needs. Thanks. Thank you. Our next question comes from Phil Stefano from Deutsche Bank. Your line is now open. Yeah, thanks. Good morning, and congrats on the quarter. I guess just a quick follow-up on the pending acquisition of Willis Towers Watson. There was a question earlier about the $1.8 billion revenue marker in the agreement. To me, this is a pretty specific number. Can you give any flavor on how this number came to be that that was the line in the sand at which we might need to go back and get approvals? Yeah. We step back, again, the shareholder value question was asked and answered as we did in August. We would come back, Phil, to the opportunity that we see and how it's evolved over time. What we really want you to take away is the opportunity we saw a year ago is stronger now than we saw a year ago. By the way, that's not just the work that Eric described and how the teams have come together and seen all the possibilities. That's also pandemic. One of the outcomes of pandemic is really an amplification in both awareness across the globe, literally across every company in the world. There's a bigger awareness for things like pandemic, climate, intangible assets, cyber, more than ever before. Also up into the C-suite in ways that it hasn't permeated before. For us, Phil, we see a tremendous opportunity. We saw that opportunity as we brought together the discussion around the combination last March, and we see it continuing. From our standpoint, as Christa described at the beginning, we're making our way through the process and making good progress, and we're very excited about the outcome. Okay. Worth a shot. Christa, you had mentioned that the expense guidance that you gave, and I appreciate that has some potential resumption in T&E for later this year. I was hoping you could just flesh out how you're thinking about, without any specifics, just generally how you're thinking about that. If I want to run an actual versus expected of the world opening back up and people getting back to whatever normal business activities look like moving forward, how can I compare that to how you were thinking about it? Phil, I guess I'd start with, we've got a 10-year track record of margin expansion, approximately 90 basis points for a decade, every year. We expect margin expansion for the full year 2021. We're obviously not giving specific guidance for margin expansion for 2021. I'd say if you look to the rest of 2021, we should anticipate some investment in the business and some potential of resumption of T&E later in the year. That's really all in the context of overall margin expansion for 2021. Greg, you may want to talk about this just from the client perspective and how we're thinking about T&E and delivering for clients. Yeah. Phil, it's really an excellent question around sort of how the business evolves and this idea of new better. We're not kidding. Actually, it's been amazing. The 10 coalitions we have are literally major cities around the world in Chicago and New York and London and Tokyo and Madrid, Singapore, et cetera, and these are the largest companies in the world, really comparing notes on how they come back together, work, travel, convene in the process. We've just taken away a huge amount from that. In many respects, when we think about client leadership and how we go engage with clients, obviously the face-to-face is key and will continue to be key, but our ability to make a difference with clients in remote environments when we can actually amplify what it means to be Aon United, literally bringing colleagues from around the world, obviously in a virtual way, to clients, has proven to us to be unbelievably effective on both new business with existing clients, but also net new opportunities. Very, Eric, you've led this work around the world. Maybe you can talk a bit about this because it's very important as you think about T&E overall. Yeah. Sure, Greg. Look, we're going to be smart about how we do T&E in the future as business opens up to in-person meetings, and it's ultimately a positive step in the global recovery that we can interact. We've learned a lot. As we've said it in the past, just using that example, Greg, to go a little bit deeper, historically, if a client wanted to talk about a situation that was occurring outside their home country, we'd either try and do a conference call or plan a trip. Now what we do is we open up Webex, we actually have the leader of the country, leader of the issue in that country on the Webex, we can solve the issue right away. Certainly, there's efficiency and cost advantages to it. More importantly, I think there's enormous client value to unlock that expertise in an immediate way where they're not getting an interpretation through someone else. They're talking right to the source and getting that value in real time. Ultimately, we're going to use what we've learned, and we're going to meet the clients where they want to be met. I think we've learned a lot, and we're going to apply it. One of the things that, just a final piece I'd add on this, Phil, because it's important to us because we really worked it for a decade. Obviously, anybody can open up Webex, as Eric described, and put faces on there. When you actually put colleagues around the world from different solution lines together, and it's clear to the client that they know each other, they're reacting to different situations, they're supporting each other, that's non-duplicatable. That's taken us a decade to work through. It turns out the 10 faces on the screen amplifies what it means to work Aon United together as one firm, and that's what clients see. They've commented on it to us, which is, "Wow, I didn't really understand what this meant before." By the only way they could've seen it is, as Eric described, we put 10 people in a conference room, which we're never going to do. But 10 on Webex, totally interacting on behalf of clients, really addressing their issues, that is pretty cool. The example I gave in the commentary upfront around the vaccine protection was exactly that. It was a group of people together that probably wouldn't have got together in the same way before. We just want you to understand how we're thinking about our business as T&E comes back, but it's much, much broader than that. Okay. Thanks for all the color. I'll take a swing at one more. When I look at the, what I would call the underlying expenses, that's revenue less adjusted operating income in the first quarter, is there anything abnormal in the growth rate or anything that you'd call out that makes the growth rate we saw first quarter 2021 versus first quarter 2020 not a good way to think about this? If you're talking about expenses, Phil, what I'd note in expenses is, in 2021, you have a lot less T&E, and you have a lot less investment in the business compared to Q1 2020. The margin expansion is much more pronounced in Q1 than you might get in the full year. We do expect full- year margin expansion. We did see an increase in comp and benefits due to FX, but also due to investment in the business. I guess they're probably the two unusual things I'd sort of note in Q1. Great. All right. I appreciate it. Thank you. Thank you. Our next question comes from David Motemaden from Evercore ISI. Hi. Thanks. Good morning. I wanted to just talk about the strong level of organic growth this quarter. I guess I was just wondering, is there anything one-off in this result this quarter? Just as I think about the rest of the year, is there any reason why we shouldn't expect an acceleration in organic growth from these levels? As we described, David, listen, our view is great momentum as we begin the year, no doubt. First quarter strong across the board on all aspects, with some real standouts. We see as macroeconomic conditions evolve, mid-single digit or greater as we think about where we are for the year. Obviously, the first quarter gave us real confidence, growing confidence in that, assuming macroeconomic conditions hold. Got it. Nothing one-off in that result that would lead you to think that we should come down off of this 6%? No. Okay. That's helpful. It was across the board in terms of sort of all the different aspects, Commercial Risk, Reinsurance, Retirement, Health, across the board with real great work by the teams around the world on new business growth and growth in project-related work, which came back a bit, particularly in some of the shorter lines. Got it, thanks. Then maybe just on the combination with Willis. Christa, I think you had said something to the effect that you would expect to achieve the $800 million of cost synergies in any level of concessions, but I guess I just wanted to sort of dig into that, is like maybe just talk about is there a level that would make that tough to achieve? Maybe just sort of peel back the onion a little bit on just what gives you confidence that you can get to that $800 million of saves. Yeah. David, we continue to anticipate $800 million of cost synergies considering the remedies we've offered. We'd expect to allocate any divestiture proceeds according to our ROIC framework, in which share buyback continues to be our highest expected return activity. I would note that the $800 million of cost synergies, we're very confident in achieving. It's 5.5% of the combined cost base. We achieved 11% of the combined cost base in Aon Hewitt, and 18% of the combined cost base in Aon Benfield. There's no structural differences here. We feel really good about achieving that $800 million. Got it. Helpful. That's clear. Maybe if I could just sneak one more in. Just on the margin, you guys obviously, I appreciate the slide you guys put in the deck. You guys have expanded margins by 90 basis points a year over the last decade. You did 170 basis points in the first quarter. Obviously, you need comps there. I know that you guide for the full year. I guess, is there any reason to expect that margin shouldn't expand here over the next three quarters? First of all, David, we absolutely expect full- year margin expansion for the year 2021. We think about margin expansion in the context of full year, because quarter- to- quarter expenses will be lumpy, as we sort of talked about with the re-patterning of expenses. What we would say is Q1 was unusual in terms of margin expansion because we had a pre-pandemic comparable in Q1 2020. I'd think about margin expansion over the course of the full year 2021. As you said, we had a 10-year track record of 890 basis points of margin expansion over the last 10 years, so 90 basis points a year. We're on track to do full- year margin expansion again in 2021. Thank you. Thank you. Our final question comes from Meyer Shields from KBW. Your line is now open. Thanks. I guess beginning basic question, you talked a little bit about the blockchain for premium clearing house. How should we expect to see that in the financials? Doesn't have to be numbers, but where does that make a difference? Yeah. It really makes a difference in terms of margin expansion. It's driving improved quality and therefore reduced errors. It's driving efficiency because it's allowing colleagues to spend more time on higher- value activities with their clients. It's both reduced errors and improved efficiency. Utilizing client experience. Meyer, the simple answer is operating margin expansion. Okay. No, that's perfect. That's exactly what I was looking for. Second question. You never, I think disclosed a number for the expected revenue synergies from the innovation. I know that the $800 million savings guidance is still there. Is the internal number for revenues still the same? Well, as we said before, we didn't disclose, Meyer, as you described. The entire reason we are bringing the combination together really goes back to this idea of we've got to find ways to accelerate innovation on behalf of clients, continue to do what we're doing, but just keep getting better on their behalf. Meyer, it's not hard to find the categories where we can continue to improve and support. Look at issues like pandemic, obviously. Now, how are we going to bring solutions that really matter for clients in climate? As they think about taking actions to go zero carbon, how do we help them reduce volatility in doing that? We had a set of views back in March 2020 on that, and Eric, I think described it very well. As we spent time with our colleagues at Willis Towers Watson, we see more potential and possibilities than ever. Pandemic happened. Clients are actually more attuned. They're like, "What am I going to do on this? How am I going to play it out?" Things like intangible assets. We've made great progress on intangible assets and how you think about defending the house on intangible assets. Now with Willis Towers Watson, the opportunity we believe is even greater, areas like cyber, et cetera. We were excited in 2020 around the possibilities on what we can do to drive innovation, which is in fact net new opportunity for clients and for colleagues, but also revenue. We see that opportunity greater now than we saw it a year ago. Thank you. I would now like to turn the call back over to Greg Case for closing remarks. Thank you, Brittany. I just wanted to say to everyone, thank you very much for joining this quarter. We appreciate it and very much look forward to our discussion next quarter. Thanks so much. Thank you for your participation in today's conference. All participants may disconnect at this time.