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Earnings Per Share (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Dec. 31, 2011
Basic EPS:            
Net income $ 210,000,000 $ 155,000,000 $ 365,000,000 $ 261,000,000    
Weighted average common shares outstanding 196,600,000 204,100,000 197,300,000 204,400,000    
Earnings per common share - basic $ 1.07 $ 0.76 $ 1.85 $ 1.28    
Diluted EPS:            
Net income 210,000,000 155,000,000 365,000,000 261,000,000    
Weighted average common shares outstanding 196,600,000 204,100,000 197,300,000 204,400,000    
Effect of dilutive securities:            
Stock options, RSUs, PSUs and dividend equivalent units 1,200,000 1,400,000 1,300,000 1,600,000    
Weighted average common shares outstanding and common stock equivalents 197,800,000 205,500,000 198,600,000 206,000,000    
Earnings per common share - diluted $ 1.06 $ 0.76 $ 1.84 $ 1.27    
Earnings Per Share (Textuals) [Abstract]            
Exclusion from the diluted weighted average shares outstanding 400,000 600,000 600,000 600,000    
Prepaid forward repurchase contract 50,000,000   50,000,000   0  
Dividend equivalent units outstanding 105,285   105,285      
Aggregate shares authorized under repurchase program, initial amount           3,000,000,000
Number of shares repurchased and retired 2,700,000 500,000 3,900,000 2,800,000    
Value of shares repurchased and retired 146,000,000 25,000,000 206,000,000 126,000,000    
Stock Repurchase Program, Value of Shares Authorized to be Repurchased $ 366,000,000   $ 366,000,000