Goodwill and Other Intangibles (Changes in the Carrying Amount of Goodwill) (Details) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015
Goodwill [Roll Forward]
Balance as of January 1, as reported		$ 7,889	$ 7,241
Goodwill acquired		62	188
Other adjustments	[1]	(6)	(48)
Balance at June 30,		$ 7,945	$ 7,381

[1] Primarily reflects the impact of foreign exchange in each period.