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Share-Based Compensation Plans - Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Shares      
Outstanding at beginning of period (in shares) 1,127 1,272 2,484
Granted (in shares) 145 166 147
Exercised (in shares) (680) (279) (1,255)
Expired or cancelled (in shares) (18) (32) (104)
Outstanding at end of period (in shares) 574 1,127 1,272
Vested or expected to vest (in shares) 571 1,122 1,267
Exercisable (in shares) 220 756 911
Wtd. Avg. Exercise Price Per Share      
Outstanding at beginning of period (in dollars per share) $ 66 $ 64 $ 59
Granted (in dollars per share) 97 75 77
Exercised (in dollars per share) 64 63 56
Expired or cancelled (in dollars per share) 75 67 56
Outstanding at end of period (in dollars per share) 77 66 64
Vested or expected to vest (in dollars per share) 77 66 64
Exercisable (in dollars per share) $ 65 $ 62 $ 62
Wtd. Avg. Remaining Contractual Term and Aggregate Intrinsic Value      
Outstanding (in years) 7 years 1 month 6 days 4 years 10 months 24 days 5 years 2 months 12 days
Vested or expected to vest (in years) 7 years 1 month 6 days 4 years 10 months 24 days 5 years 2 months 12 days
Exercisable (in years) 5 years 3 months 18 days 3 years 3 months 18 days 4 years
Exercised $ 24 $ 5 $ 39
Outstanding 28 26 26
Exercisable $ 14 $ 20 $ 20