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Business Combinations - Additional Information (Details) $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2024 USD ($) | Dec. 31, 2024 USD ($) Acquisition | Dec. 31, 2023 USD ($) Acquisition | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Number of acquisitions | Acquisition |  | 32 | 33 |  |
Measurement period adjustment, total considration |  | $ 11 |  |  |
Measurement period adjustment, fiduciary liabilities |  | 20 |  |  |
Measurement period adjustment, amortizable intangible assets |  | 11 |  |  |
Measurement period adjustment, other net asstes |  | 9 |  |  |
Measurement period adjustment, goodwill |  | 9 |  |  |
Cash paid | $ 4 | 934 | $ 695 |  |
Measurement period adjustment, goodwill |  | 9 | (12) |  |
Goodwill | 707 | 707 |  |  |
Goodwill currently deductible for income tax purposes | 121 | 121 |  |  |
Goodwill related to the recorded earn-out payables | 35 | 35 |  |  |
Total revenues related to acquisitions |  | 40 |  |  |
Income before income taxes related to acquisitions |  | 1 |  |  |
Maximum future contingency payments acquisitions | 497 | 497 |  |  |
Estimated acquisition earn-out payables | 167 | 167 | 249 | $ 252 | $ 291
Goodwill currently non-deductible for income tax purposes excluding related to the recorded earn-out payables | 551 | 551 |  |  |
Goodwill after deducted for income tax | 586 | 586 |  |  |
Other Liabilities |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Estimated acquisition earn-out payables | 92 | 92 | 103 |  |
Accounts payable |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Estimated acquisition earn-out payables | 75 | 75 | 146 |  |
Retail |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Measurement period adjustment, goodwill |  | (37) | 13 |  |
Goodwill net |  | 634 |  |  |
Programs |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill net |  | 40 |  |  |
Wholesale Brokerage |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Measurement period adjustment, goodwill |  | 6 | $ (2) |  |
Goodwill net |  | $ 33 |  |  |
Assets and Assumed Certain Liabilities |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of acquisitions | Acquisition |  | 14 |  |  |
Business Combinations - Stock Deals |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of acquisitions | Acquisition |  | 14 |  |  |
Book of Business Purchases |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of acquisitions | Acquisition |  | 4 |  |  |
GRP Holdco Limited |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Maximum potential earn- out payable | 0 | $ 0 |  |  |
Quintes Holding B.V | Retail |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill | $ 468 | $ 468 |  |  |

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