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Supplemental Disclosures (Schedule of Supplemental Cash Flow Disclosures) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2021 | Jun. 30, 2021 | Sep. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Supplemental Cash Flow Information [Abstract] |  |  |  |  |  |
Assets acquired, excluding cash |  |  |  | $ 1,697 | $ 929 | $ 8,655
Fiduciary liabilities assumed |  |  |  | (18) | (21) | (1,276)
Liabilities assumed |  |  |  | (213) | (78) | (2,804)
Non-controlling interests assumed |  |  |  | (64) | 0 | (280)
Fair value of previously-held equity method investment |  |  |  | (390) | 0 | 0
Contingent and deferred purchase consideration |  |  |  | (153) | (183) | (66)
Net cash outflow for acquisitions | $ 0 | $ 350 | $ 384 | 859 | 647 | 4,229
Interest paid |  |  |  | 441 | 481 | 427
Income taxes paid, net of refunds |  |  |  | $ 1,069 | $ 673 | $ 661

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