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Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities - Additional Information (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 15, 2023 | Jun. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Supplemental Cash Flow Elements [Abstract] |  |  |  |  |
Effect of foreign exchange rate changes on cash and cash equivalents inclusive of fiduciary cash |  |  | $ 13 | $ (34) | $ 131
Cash received from settlement of contingent payments |  | $ 57 |  |  |
Deferred federal income tax payments amounts due to Hurricane Debby and Milton tax relief |  |  | $ 90 |  |
Deferred federal income tax payments amounts due to Hurricane Idalia Tax Relief |  |  |  | 121 |
Payments of accrued federal income tax payments due | $ 31 |  |  |  |
Tax payments associated with gain on disposal of businesses sold |  |  |  | $ 30 |

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