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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, 2019 | Sep. 30, 2018
Supplemental Cash Flow Information [Abstract] |  |
Assets acquired, excluding cash | $ 8,619 | $ 679
Liabilities assumed | (2,758) | (35)
Non-controlling interests assumed | (295) | 0
Contingent/deferred purchase consideration | (66) | (108)
Net cash outflow for current year acquisitions | 5,500 | 536
Interest paid | 387 | 225
Income taxes paid, net of refunds | $ 442 | $ 455

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