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Revenue (Tables) | 6 Months Ended
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Jun. 30, 2025
Revenue from Contract with Customer [Abstract] |
Schedule of Disaggregation of Revenue | The following table disaggregates various components of the Company's revenue:
| Three Months Ended June 30, |  | Six Months Ended June 30,
(In millions) | 2025 |  | 2024 |  | 2025 |  | 2024
Marsh: |  |  |  |  |  |  |
EMEA | $ | 1,006 |  |  | $ | 912 |  |  | $ | 2,065 |  |  | $ | 1,937 |
Asia Pacific | 409 |  |  | 391 |  |  | 744 |  |  | 727 |
Latin America | 132 |  |  | 137 |  |  | 256 |  |  | 262 |
Total International | 1,547 |  |  | 1,440 |  |  | 3,065 |  |  | 2,926 |
U.S./Canada | 2,302 |  |  | 1,825 |  |  | 4,237 |  |  | 3,342 |
Total Marsh | 3,849 |  |  | 3,265 |  |  | 7,302 |  |  | 6,268 |
Guy Carpenter | 677 |  |  | 632 |  |  | 1,883 |  |  | 1,780 |
Subtotal | 4,526 |  |  | 3,897 |  |  | 9,185 |  |  | 8,048 |
Fiduciary interest income | 99 |  |  | 125 |  |  | 202 |  |  | 247 |
Total Risk and Insurance Services | $ | 4,625 |  |  | $ | 4,022 |  |  | $ | 9,387 |  |  | $ | 8,295 |
Mercer: |  |  |  |  |  |  |
Wealth | $ | 685 |  |  | $ | 612 |  |  | $ | 1,355 |  |  | $ | 1,284 |
Health | 594 |  |  | 547 |  |  | 1,202 |  |  | 1,085 |
Career | 219 |  |  | 220 |  |  | 437 |  |  | 435 |
Total Mercer | 1,498 |  |  | 1,379 |  |  | 2,994 |  |  | 2,804 |
Oliver Wyman Group | 873 |  |  | 837 |  |  | 1,691 |  |  | 1,626 |
Total Consulting | $ | 2,371 |  |  | $ | 2,216 |  |  | $ | 4,685 |  |  | $ | 4,430 |
Schedule of Contract Assets and Liabilities | The following table provides contract assets and contract liabilities information from contracts with customers:
(In millions) | June 30, 2025 |  | December 31, 2024
Contract assets | $ | 537 |  |  | $ | 473 |
Contract liabilities | $ | 965 |  |  | $ | 866 |

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-10 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 + Details
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