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Stock-Based Compensation (Details 4) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Performance shares      
Restricted stock rights, weighted-average grant date fair value information      
Performance-vesting restricted stock rights granted without an accounting grant date (shares) 1,700    
Stock-based compensation, unrecognized compensation $ 17    
Stock-based compensation, unrecognized compensation weighted-average period of recognition 1 year 3 months 10 days    
Performance-vesting restricted stock rights for which the accounting grant date has not been set (shares) 3,400    
Restricted Stock Rights      
Restricted stock rights activity      
Restricted stock rights at the beginning of the period (in shares) 17,967    
Restricted stock rights, granted (in shares) 2,330    
Restricted stock rights, vested (in shares) (7,146)    
Restricted stock rights, forfeited (in shares) (1,221)    
Restricted stock rights at the ending of the period (in shares) 11,930 17,967  
Restricted stock rights, weighted-average grant date fair value information      
Restricted stock rights, weighted-average grant date fair value at the beginning of the period (in dollars per share) $ 11.85    
Restricted stock rights, weighted-average grant date fair value, granted (in dollars per share) 29.31    
Restricted stock rights, weighted-average grant date fair value, vested (in dollars per share) 12.80    
Restricted stock rights, weighted-average grant date fair value, forfeited (in dollars per share) 15.23    
Restricted stock rights, weighted-average grant date fair value (in dollars per share) ending balance $ 12.74 $ 11.85  
Stock-based compensation, unrecognized compensation $ 39    
Stock-based compensation, unrecognized compensation weighted-average period of recognition 1 year 1 month 20 days    
Total fair value of shares vested $ 93 $ 92 $ 57
Stock Option Plan      
Restricted stock rights, weighted-average grant date fair value information      
Stock-based compensation, unrecognized compensation $ 43    
Stock-based compensation, unrecognized compensation weighted-average period of recognition 1 year 6 months 10 days    
Income tax benefit from stock option exercises and restricted stock rights $ 109 $ 89 $ 77