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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 | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Supplemental Cash Flow Information [Abstract] |  |
Assets acquired, excluding cash, cash equivalents, and cash and cash equivalents held in a fiduciary capacity | $ 372 | $ 17
Acquisition-related deposit | 0 | 252
Fiduciary liabilities assumed | (5) | 0
Liabilities assumed | (15) | (2)
Contingent/deferred purchase consideration | (51) | (4)
Net cash outflow for acquisitions | 301 | 263
Interest paid | 225 | 165
Income taxes paid, net of refunds | $ 239 | $ 223

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