Goodwill and Other Intangibles (Changes in the Carrying Amount of Goodwill) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013
Goodwill [Roll Forward]
Balance as of January 1, as reported	$ 6,893		$ 6,792
Goodwill acquired	334		62
Other adjustments	3	[1]	(50)	[1]
Balance at June 30,	$ 7,230		$ 6,804

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