Stockholders Equity (Details) (USD $) Share data in Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 11, 2013
Stockholders' Equity Attributable to Parent [Abstract]
Treasury Stock, Shares, Acquired	14
Treasury Stock, Value, Acquired, Cost Method	$ 500,000,000	$ 513,000,000	$ 8,000,000	$ 308,000,000
Authorized Stock Repurchase Program Repurchased Number Of Shares		92
Authorized Stock Repurchase Program Repurchase Amount		3,722,000,000
Additional Treasury Stock Amount of Repurchase Authorization					1,200,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 2,500,000,000