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Share-Based Compensation Plans - Narrative (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
RSUs granted (in shares) 121 86
Weighted-average fair value per RSU granted (in dollars per share) $ 55.88 $ 64.20
Options granted (in shares) 46 190
Weighted- average exercise price of options granted in period (in dollars per share) $ 55.88 $ 64.20
Weighted- average fair value per option granted (in dollars per share) $ 7.83 $ 7.89
Total pretax unrecognized compensation expense related to nonvested stock options $ 798  
Weighted average period in years of recognition for nonvested stock options 2 years 4 months 24 days