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Supplemental Disclosures to the Consolidated Statements of Cash Flows (Additional Information Concerning Acquisitions, Interest and Income Taxes Paid) (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023
Supplemental Cash Flow Information [Abstract] |  |
Assets acquired, excluding cash, cash equivalents, and cash and cash equivalents held in a fiduciary capacity | $ 1,310 | $ 760
Fiduciary liabilities assumed | (8) | (14)
Liabilities assumed | (84) | (98)
Contingent/deferred purchase consideration | (176) | (29)
Net cash outflow for acquisitions | 1,042 | 619
Interest paid | 538 | 427
Income taxes paid, net of refunds | $ 922 | $ 699

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