Goodwill and Other Intangibles (Changes in the Carrying Amount of Goodwill) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013
Goodwill [Roll Forward]
Balance as of January 1, as reported	$ 6,893		$ 6,792
Goodwill acquired	350		93
Other adjustments	(64)	[1]	(20)	[1]
Balance at September 30,	$ 7,179		$ 6,865

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