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, 2012	Sep. 30, 2011
Supplemental Cash Flow Information [Abstract]
Assets acquired, excluding cash	$ 160	$ 148
Liabilities Assumed	(39)
Liabilities assumed	(50)	(19)
Contingent/deferred purchase consideration	19	16
Net cash outflow for current year acquisitions	102	113
Purchase of other intangibles	0	2
Purchase of other intangibles	0	3
Deferred purchase consideration from prior year acquisitions	51	16
Net cash outflow for acquisitions	153	134
Interest paid	150	163
Income taxes (refunded)/paid	$ 237	$ (37)