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Capital Stock (Details) (USD $)
Share data in Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Capital Stock (Textual) [Abstract]    
Share Repurchase Program $ 1,000,000,000  
Repurchase of shares of common stock 2.15  
Aggregate price of repurchase 49,000,000  
Number of shares repurchased of common stock 0.6  
Liability for repurchases of common stock 13,000,000  
Aggregate number of shares repurchased 5.7  
Shares repurchased aggregate value 480,000,000  
Number of shares repurchased under settlement of employee tax withholding obligations 0.1 0.1
Shares repurchased aggregate value under settlement of employee tax withholding obligations $ 2,000,000 $ 5,000,000