Stock Repurchase Programs (Details) (USD $)	6 Months Ended		12 Months Ended	6 Months Ended	1 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 Stock Repurchase Programs, Combined [Member]	Jun. 30, 2012 Stock Repurchase Program 2012	Jun. 30, 2012 Stock Repurchase Program 2014
Equity, Class of Treasury Stock [Line Items]
Treasury shares retired				0
Amount authorized under stock repurchase program					$ 2,000,000,000	$ 5,000,000,000
Shares Repurchased [Roll Forward]
Shares repurchased, beginning balance	25,000,000
Shares repurchased				66,000,000
Shares repurchased, ending balance	91,000,000		25,000,000
Treasury stock acquired under stock repurchase program, average price per share	$ 53.29		$ 54.30	$ 52.90
Stock Repurchased Value [Roll Forward]
Treasury Stock Value of Shares Repurchased	1,360,000,000
Repurchase of common stock				3,467,000,000
Treasury Stock Value of Shares Repurchased	4,827,000,000		1,360,000,000
Stock Repurchase Remaining Authorized Amount [Roll Forward]
Stock Repurchase remaining amount authorized, beginning balance	2,173,000,000		640,000,000
Repurchases of common stock	(3,468,000,000)	(942,000,000)		(3,467,000,000)
Stock Repurchase remaining amount authorized, ending balance	$ 2,173,000,000		$ 640,000,000