Acquisitions / Dispositions (Allocation Of Acquisition Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Cash		$ 1,000
Estimated fair value of deferred/contingent consideration	$ 36	176	$ 197
Total consideration	901	1,200
Allocation of purchase price:
Goodwill	8,369	$ 7,889	$ 7,241
Current Fiscal Period Acquisitions
Business Acquisition [Line Items]
Cash	865
Estimated fair value of deferred/contingent consideration	36
Total consideration	901
Allocation of purchase price:
Cash and cash equivalents	52
Accounts receivable, net	49
Other current assets	8
Property, plant, and equipment	22
Other intangible assets	307
Goodwill	556
Other assets	18
Total assets acquired	1,012
Current liabilities	57
Other liabilities	54
Total liabilities assumed	111
Net assets acquired	$ 901