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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, 2017
Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Pretax share-based compensation expense $ 74 $ 68
Income tax benefit (22) (20)
Total share-based compensation expense, net of taxes $ 52 $ 48