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v3.25.1

Segment Information (Tables) | 3 Months Ended
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Mar. 31, 2025
Segment Reporting [Abstract] |
Schedule of Selected Information and Details for MMC's Operating Segments | Selected information about the Company’s segments is as follows:
|  | Three Months Ended March 31,
(In millions) |  | Revenue |  | Compensation and benefits |  | Depreciation and amortization expense |  | Identified intangible amortization expense |  | Other operating expenses | Operating Income (Loss)
2025 – |  |  |  |  |  |  |  |  |  |  |
Risk and Insurance Services |  | $ | 4,762 |  | (a) | $ | 2,451 |  |  | $ | 50 |  |  | $ | 120 |  |  | $ | 528 |  | $ | 1,613 |
Consulting |  | 2,314 |  | (b) | 1,363 |  |  | 24 |  |  | 19 |  |  | 452 |  | 456 |
Total Segments |  | 7,076 |  |  | 3,814 |  |  | 74 |  |  | 139 |  |  | 980 |  | 2,069 |
Corporate/Eliminations |  | (15) |  |  | 36 |  |  | 14 |  |  | — |  |  | (1) |  | (64) |
Total Consolidated |  | $ | 7,061 |  |  | $ | 3,850 |  |  | $ | 88 |  |  | $ | 139 |  |  | $ | 979 |  | $ | 2,005 |
2024 – |  |  |  |  |  |  |  |  |  |  |
Risk and Insurance Services |  | $ | 4,273 |  | (a) | $ | 2,118 |  |  | $ | 46 |  |  | $ | 79 |  |  | $ | 465 |  | $ | 1,565 |
Consulting |  | 2,214 |  | (b) | 1,314 |  |  | 37 |  |  | 11 |  |  | 420 |  | 432 |
Total Segments |  | 6,487 |  |  | 3,432 |  |  | 83 |  |  | 90 |  |  | 885 |  | 1,997 |
Corporate/Eliminations |  | (14) |  |  | 38 |  |  | 16 |  |  | — |  |  | 4 |  | (72) |
Total Consolidated |  | $ | 6,473 |  |  | $ | 3,470 |  |  | $ | 99 |  |  | $ | 90 |  |  | $ | 889 |  | $ | 1,925 |
(a)Includes interest income on fiduciary funds of $103 million and $122 million in 2025 and 2024, respectively. Revenue in 2025 also includes $28 million from a gain on the sale of the TCAS business and a gain on remeasurement of a previously held equity method investment to fair value upon consolidation. (b)Includes inter-segment revenue of $15 million and $13 million in 2025 and 2024, respectively. Revenue in 2024 also includes a net gain of $21 million from the sale of Mercer's U.K. pension administration and U.S. health and benefits administration businesses.
Schedule of Details of Operating Segment Revenue | Details of operating segment revenue are as follows:
|  |  | Three Months Ended March 31,
(In millions) |  |  |  |  | 2025 |  | 2024
Risk and Insurance Services |  |  |  |  |  |  |
Marsh |  |  |  |  | $ | 3,520 |  |  | $ | 3,081 |
Guy Carpenter |  |  |  |  | 1,242 |  |  | 1,192 |
Total Risk and Insurance Services |  |  |  |  | 4,762 |  |  | 4,273 |
Consulting |  |  |  |  |  |  |
Mercer |  |  |  |  | 1,496 |  |  | 1,425 |
Oliver Wyman Group |  |  |  |  | 818 |  |  | 789 |
Total Consulting |  |  |  |  | 2,314 |  |  | 2,214 |
Total Segments |  |  |  |  | 7,076 |  |  | 6,487 |
Corporate Eliminations |  |  |  |  | (15) |  |  | (14) |
Total |  |  |  |  | $ | 7,061 |  |  | $ | 6,473 |

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- Definition Tabular disclosure of all significant reconciling items in the reconciliation of total revenues from reportable segments to the entity's consolidated revenues. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-31 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-30 + Details
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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-25 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-30 + Details
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