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Stock Compensation Plans (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense $ 16 $ 12 $ 45 $ 32
Tax benefit (6) (4) (14) (10)
Total stock-based compensation (net of tax) 10 $ 8 $ 31 $ 22
Expected volatility     33.90%  
Expected dividend yield     0.00%  
Risk-free rate     1.21%  
Weighted average fair value per share     $ 14.93  
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected term     60 months  
Total unrecognized compensation cost related to unvested awards $ 130   $ 130  
Total unrecognized compensation cost related to unvested awards, period for recognition (in years)     1 year 4 months  
Restricted Stock Units (RSUs) [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Explicit service period     36 months  
Restricted Stock Units (RSUs) [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Explicit service period     48 months