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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 | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021
Supplemental Cash Flow Information [Abstract] |  |
Assets acquired, excluding cash and cash and cash equivalents held in a fiduciary capacity | $ 164 | $ 561
Acquisition-related deposit | 24 | 0
Fiduciary liabilities assumed | (2) | (13)
Liabilities assumed | (24) | (60)
Contingent/deferred purchase consideration | (11) | (138)
Net cash outflow for acquisitions | 151 | 350
Interest paid | 215 | 234
Income taxes paid, net of refunds | $ 437 | $ 403

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