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, 2013	Sep. 30, 2012
Supplemental Cash Flow Information [Abstract]
Assets acquired, excluding cash	$ 199	$ 160
Liabilities assumed	(59)	(39)
Contingent/deferred purchase consideration	(37)	(19)
Net cash outflow for current year acquisitions	103	102
Purchase of other intangibles	1	0
Deferred purchase consideration from prior years' acquisitions	4	51
Net cash outflow for acquisitions	108	153
Interest paid	140	150
Income taxes paid	$ 258	$ 237