Acquisitions (Allocation Of Acquisition Costs) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Cash	$ 77	$ 20
Estimated fair value of deferred/contingent consideration	26	12
Total Consideration	103	32
Allocation of purchase price:
Goodwill	7,950	$ 7,160	$ 7,889	$ 7,241
Current Fiscal Period Acquisitions
Business Acquisition [Line Items]
Cash	77
Estimated fair value of deferred/contingent consideration	26
Total Consideration	103
Allocation of purchase price:
Cash and cash equivalents	2
Accounts receivable, net	1
Property, plant, and equipment	1
Other intangible assets	42
Goodwill	61
Total assets acquired	107
Current liabilities	2
Other liabilities	2
Total liabilities assumed	4
Net assets acquired	$ 103