Acquisitions (Allocation Of Acquisition Costs) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Cash	$ 420	$ 79
Estimated fair value of deferred/contingent consideration	90	26
Total Consideration	510	105
Allocation of purchase price:
Goodwill	8,821	$ 7,945	$ 8,369	$ 7,889
Current Fiscal Period Acquisitions
Business Acquisition [Line Items]
Cash	420
Estimated fair value of deferred/contingent consideration	90
Total Consideration	510
Allocation of purchase price:
Cash and cash equivalents	8
Accounts receivable, net	7
Property, plant, and equipment	3
Other intangible assets	196
Goodwill	370
Total assets acquired	584
Current liabilities	4
Other liabilities	70
Total liabilities assumed	74
Net assets acquired	$ 510