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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
Mar. 31, 2018
Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Pretax share-based compensation expense $ 80 $ 74
Income tax benefit (15) (22)
Total share-based compensation expense, net of taxes $ 65 $ 52