Capital Transactions (Details) (USD $)	0 Months Ended	12 Months Ended		0 Months Ended
	Oct. 11, 2013	Dec. 31, 2013	Dec. 31, 2012	Feb. 03, 2015	Feb. 02, 2012	Feb. 03, 2011
Share Repurchase Program [Line Items]
Cost of common stock repurchased under the stock repurchase program		$ 5,830,000,000	$ 315,000,000
Shares of common stock repurchased	429,000,000
2015 Share Repurchase Program
Share Repurchase Program [Line Items]
Stock repurchase program, dollar amount authorized				750,000,000
2012 Share Repurchase Program
Share Repurchase Program [Line Items]
Stock repurchase program, dollar amount authorized					1,000,000,000
Cost of common stock repurchased under the stock repurchase program		0	54,000,000
Shares of common stock repurchased		0	4,000,000
2011 Share Repurchase Program
Share Repurchase Program [Line Items]
Stock repurchase program, dollar amount authorized						1,500,000,000
Cost of common stock repurchased under the stock repurchase program			$ 261,000,000
Shares of common stock repurchased			22,000,000