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Share-Based Compensation Plans - Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
RSUs granted (in shares) 5 5
Weighted-average fair value per RSU granted (in dollars per share) $ 63.97 $ 54.54
Options granted (in shares) 4 6
Weighted- average exercise price of options granted in period (in dollars per share) $ 63.98 $ 54.61
Weighted- average fair value per option granted (in dollars per share) $ 7.05 $ 5.89
Total pretax unrecognized compensation expense related to nonvested stock options $ 633  
Weighted average period in years of recognition for nonvested stock options 2 years 2 months 12 days