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
	Sep. 30, 2015	Sep. 30, 2014
Supplemental Cash Flow Information [Abstract]
Assets acquired, excluding cash	$ 636	$ 598
Liabilities assumed	(51)	(45)
Contingent/deferred purchase consideration	(154)	(147)
Net cash outflow for acquisitions	431	406
Interest paid	126	126
Income taxes paid	$ 335	$ 306