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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, 2021 | Sep. 30, 2020
Supplemental Cash Flow Information [Abstract] |  |
Assets acquired, excluding cash | $ 601 | $ 795
Liabilities assumed | (59) | (73)
Contingent/deferred purchase consideration | (141) | (163)
Net cash outflow for current year acquisitions | 401 | 559
Interest paid | 407 | 437
Income taxes paid, net of refunds | $ 686 | $ 414

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