Goodwill and Other Intangibles (Changes in the Carrying Amount of Goodwill) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Goodwill [Roll Forward]
Balance as of January 1, as reported	$ 6,893		$ 6,792
Goodwill acquired	267		0
Other adjustments	(1)	[1]	(40)	[1]
Balance at March 31,	$ 7,159		$ 6,752

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