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	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Supplemental Cash Flow Information [Abstract]
Assets acquired, excluding cash	$ 126	$ 131
Liabilities assumed	(24)	(31)
Contingent/deferred purchase consideration	(14)	(18)
Net cash outflow for current year acquisitions	88	82
Deferred purchase consideration from prior year acquisitions	3	47
Net cash outflow for acquisitions	91	129
Interest paid	89	92
Income taxes paid	$ 185	$ 160