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, 2014	Jun. 30, 2013
Supplemental Cash Flow Information [Abstract]
Assets acquired, excluding cash	$ 554	$ 126
Liabilities assumed	(40)	(24)
Contingent/deferred purchase consideration	(140)	(14)
Net cash outflow for current year acquisitions	374	88
Deferred purchase consideration from prior years' acquisitions	9	3
Net cash outflow for acquisitions	383	91
Interest paid	82	89
Income taxes paid	$ 218	$ 185