Stockholders' Equity (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Class of Stock [Line Items]
Preferred Stock, Shares Authorized	50,000,000	50,000,000
Common Stock, Shares Authorized	2,000,000,000	2,000,000,000
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Treasury Stock, Shares	82,000,000	0
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	37,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 508,000,000
Stock Repurchase Program, Authorized Amount	$ 1,000,000,000
Stock Repurchase Program, Number of Shares Authorized to be Repurchased	37,000,000
Stock Repurchased During Period, Shares	82,000,000	0	0