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Supplemental Disclosures to the Consolidated Statements of Cash Flows (Supplemental Cash Flow Disclosures) (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2025 | Jun. 30, 2024
Supplemental Cash Flow Information [Abstract] |  |
Assets acquired, excluding cash, cash equivalents, and cash and cash equivalents held in a fiduciary capacity | $ 162 | $ 721
Fiduciary liabilities assumed | (17) | (5)
Liabilities assumed | (21) | (18)
Fair value of previously-held equity investment | (15) | 0
Contingent/deferred purchase consideration | (47) | (54)
Net cash outflow for acquisitions | 62 | 644
Interest paid | 442 | 295
Income taxes paid, net of refunds | $ 640 | $ 658

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