Acquisitions (Allocation Of Acquisition Costs) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Cash	$ 419	$ 77
Estimated fair value of deferred/contingent consideration	90	26
Total Consideration	509	103
Allocation of purchase price:
Goodwill	8,769	$ 7,950	$ 8,369	$ 7,889
Current Fiscal Period Acquisitions
Business Acquisition [Line Items]
Cash	419
Estimated fair value of deferred/contingent consideration	90
Total Consideration	509
Allocation of purchase price:
Cash and cash equivalents	8
Accounts receivable, net	7
Property, plant, and equipment	3
Other intangible assets	204
Goodwill	363
Total assets acquired	585
Current liabilities	4
Other liabilities	72
Total liabilities assumed	76
Net assets acquired	$ 509