Supplemental Disclosures to the Consolidated Statements of Cash Flows (Additional Information Concerning Acquisitions, Interest And Income Taxes Paid) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Supplemental Cash Flow Information [Abstract]
Assets acquired, excluding cash	$ 598	$ 199
Liabilities assumed	(45)	(59)
Contingent/deferred purchase consideration	(147)	(37)
Net cash outflow for current year acquisitions	406	103
Purchase of other intangibles	0	1
Deferred purchase consideration from prior years' acquisitions	10	4
Net cash outflow for acquisitions	416	108
Interest paid	126	140
Income taxes paid	$ 306	$ 258