Acquisitions (Allocation Of Acquisition Costs) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011
Business Acquisition [Line Items]
Cash	$ 119	$ 124
Estimated fair value of deferred/contingent consideration	37	19
Total Consideration	156	205
Allocation of purchase price:
Goodwill	6,865	6,679	6,792	6,562
Current Fiscal Period Acquisitions [Member]
Business Acquisition [Line Items]
Cash	119
Estimated fair value of deferred/contingent consideration	37
Total Consideration	156
Allocation of purchase price:
Cash and cash equivalents	16
Accounts receivable, net	11
Property, plant, and equipment	4
Intangible assets	74
Goodwill	93
Other current assets	17
Total assets acquired	215
Current liabilities	26
Other liabilities	33
Total liabilities assumed	59
Net assets acquired	$ 156