Acquisitions/Dispositions (Allocation Of Acquisition Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Cash		$ 668
Estimated fair value of deferred/contingent consideration	$ 133	109	$ 36
Total consideration	1,040	777
Allocation of purchase price:
Goodwill	9,599	$ 9,089	$ 8,369
Current Fiscal Period Acquisitions
Business Acquisition [Line Items]
Cash	910
Estimated fair value of deferred/contingent consideration	133
Total consideration	1,043
Allocation of purchase price:
Cash and cash equivalents	26
Accounts receivable, net	49
Other current assets	4
Property, plant, and equipment	8
Other intangible assets	405
Goodwill	626
Other assets	8
Total assets acquired	1,126
Current liabilities	37
Other liabilities	46
Total liabilities assumed	83
Net assets acquired	$ 1,043