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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Pretax share-based compensation expense $ 91 $ 76 $ 261 $ 232
Income tax benefit (14) (23) (42) (70)
Total share-based compensation expense, net of taxes $ 77 $ 53 $ 219 $ 162