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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, 2018 | Sep. 30, 2017
Supplemental Cash Flow Information [Abstract] |  |
Assets acquired, excluding cash | $ 679 | $ 852
Liabilities assumed | (35) | (129)
Contingent/deferred purchase consideration | (108) | (94)
Net cash outflow for current year acquisitions | 536 | 629
Interest paid | 225 | 174
Income taxes paid, net of refunds | $ 455 | $ 406

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