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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, 2018 | Jun. 30, 2017
Supplemental Cash Flow Information [Abstract] |  |
Assets acquired, excluding cash | $ 204 | $ 576
Liabilities assumed | (28) | (74)
Contingent/deferred purchase consideration | (32) | (90)
Net cash outflow for current year acquisitions | 144 | 412
Interest paid | 107 | 92
Income taxes paid, net of refunds | $ 349 | $ 297

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