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Revenue from Contracts with Customers - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | $ 3,760 | $ 3,177 | $ 7,830 | $ 7,048
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 1,837 | 1,427 | 3,349 | 2,922
Americas other than United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 362 | 308 | 685 | 609
United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 548 | 506 | 1,131 | 1,060
Ireland |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 35 | 28 | 68 | 58
Europe, Middle East, & Africa other than United Kingdom and Ireland |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 566 | 512 | 1,775 | 1,614
Asia Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 412 | 396 | 822 | 785
Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | (15) | (3) | (23) | (8)
Commercial Risk Solutions | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 2,015 | 1,774 | 3,823 | 3,552
Reinsurance Solutions | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 635 | 607 | 1,802 | 1,684
Health Solutions | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 662 | 447 | 1,395 | 1,118
Wealth Solutions | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | $ 463 | $ 352 | $ 833 | $ 702

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