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Share-Based Compensation Plans - Amounts of Share-Based Compensation Cost Recorded in Consolidated Statement of Income (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Pretax share-based compensation expense $ 90 $ 82 $ 170 $ 156
Income tax benefit (13) (25) (28) (47)
Total share-based compensation expense, net of taxes $ 77 $ 57 $ 142 $ 109