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Supplemental Disclosures to the Consolidated Statements of Cash Flows (Schedule of Supplemental Cash Flow Disclosures) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Supplemental Cash Flow Information [Abstract] |  |
Assets acquired, excluding cash, cash equivalents, and cash and cash equivalents held in a fiduciary capacity | $ 65 | $ 372
Fiduciary liabilities assumed | (15) | (5)
Liabilities assumed | (7) | (15)
Fair value of previously-held equity method investment | (15) | 0
Contingent/deferred purchase consideration | (10) | (51)
Net cash outflow for acquisitions | 18 | 301
Interest paid | 317 | 225
Income taxes paid, net of refunds | $ 237 | $ 239

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