Goodwill and Other Intangibles (Changes in the Carrying Amount of Goodwill) (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014
Goodwill [Roll Forward]
Balance as of January 1, as reported		$ 7,241	$ 6,893
Goodwill acquired		356	350
Other adjustments	[1]	(91)	(64)
Balance at September 30,		$ 7,506	$ 7,179

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