Acquisitions (Allocation Of Acquisition Costs) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Cash	$ 90	$ 448
Estimated fair value of deferred/contingent consideration	29	154
Total Consideration	119	602
Allocation of purchase price:
Goodwill	7,975	$ 7,506	$ 7,889	$ 7,241
Current Fiscal Period Acquisitions
Business Acquisition [Line Items]
Cash	90
Estimated fair value of deferred/contingent consideration	29
Total Consideration	119
Allocation of purchase price:
Cash and cash equivalents	2
Accounts receivable, net	1
Property, plant, and equipment	1
Other intangible assets	45
Goodwill	74
Total assets acquired	123
Current liabilities	2
Other liabilities	2
Total liabilities assumed	4
Net assets acquired	$ 119