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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, 2020 | Jun. 30, 2019
Supplemental Cash Flow Information [Abstract] |  |
Assets acquired, excluding cash | $ 752 | $ 8,593
Liabilities assumed | (29) | (2,718)
Non-controlling interests assumed | 0 | (309)
Contingent/deferred purchase consideration | (161) | (66)
Net cash outflow for current year acquisitions | 562 | 5,500
Interest paid | 248 | 141
Income taxes paid, net of refunds | $ 227 | $ 327

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