Quarterly Financial Data (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Data [Abstract]
Restructuring Charges	$ 80	$ 11			$ 1	$ 1			$ 91	$ 2	$ 2
Restructuring Charges, Net of Tax	$ 52	$ 7
Restructuring Charges, After tax effect on net income	$ 0.04	$ 0.01
Acquisition and integration costs	$ 49	$ 122	$ 127	$ 138	86	58	$ 35	$ 57	$ 436	$ 236	$ 142
Acquisition and integration costs, after tax	$ 48	$ 74	$ 76	$ 85	$ 47	$ 27	$ 23	$ 35
Acquisition and integration costs, after tax effect on net income (in dollars per share)	$ 0.04	$ 0.06	$ 0.07	$ 0.07	$ 0.04	$ 0.02	$ 0.02	$ 0.04