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Stock Compensation Plans - Stock Option Awards (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Number of Options (in thousands)      
Outstanding at beginning of year (in shares) 5,212    
Granted (in shares) 876    
Exercised (in shares) (571)    
Forfeited (in shares) 0    
Expired (in shares) (27)    
Outstanding at end of year (in shares) 5,490 5,212  
Number of Options (in thousands), Outstanding, fully vested and expected to vest (in shares) 5,240    
Number of Options (in thousands), Exercisable at end of year (in shares) 3,737    
Weighted Average Exercise Price      
Outstanding at beginning of year (in USD per share) $ 37.25    
Granted (in USD per share) 53.81    
Exercised (in USD per share) 26.43    
Forfeited (in USD per share) 0    
Expired (in USD per share) 74.88    
Outstanding at end of year (in USD per share) 40.84 $ 37.25  
Weighted Average Exercise Price, Outstanding, fully vested and expected to vest (in USD per share) 42.79    
Weighted Average Exercise Price, Exercisable at end of year (in USD per share) $ 36.30    
Weighted Average Remaining Contractual Term, Outstanding at end of year 6 years 1 month 6 days    
Weighted Average Remaining Contractual Term, Outstanding, fully vested and expected to vest 6 years 1 month 6 days    
Weighted Average Remaining Contractual Term, Exercisable at end of year 4 years 10 months 24 days    
Aggregate Intrinsic Value, Outstanding at end of year $ 32    
Aggregate Intrinsic Value, Outstanding, fully vested and expected to vest 30    
Aggregate Intrinsic Value, Exercisable at end of year $ 32    
Employee Stock Option      
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]      
Expected dividend yield 1.80% 1.90% 2.00%
Expected annualized spot volatility minimum 20.80% 21.80% 27.30%
Expected annualized spot volatility maximum 36.50% 37.90% 41.30%
Weighted average annualized volatility 29.00% 29.50% 34.10%
Risk-free spot rate minimum 1.50% 0.40% 0.30%
Risk-free spot rate maximum 2.90% 2.40% 1.80%
Expected term 5 years 8 months 12 days 5 years 5 years