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Share-Based Incentive Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Stock options vested at end of period, number (in shares) 7,029,165  
Stock options vested at end of period, weighted average exercise price (in dollars per share) $ 103.80  
Stock options vested at end of period, weighted average contractual life remaining (in years) 5 years 9 months 18 days  
Stock options vested at end of period, aggregate intrinsic value $ 237  
Stock options exercisable at end of period, number (in shares) 5,124,196  
Stock options exercisable at end of period, weighted average exercise price (in dollars per share) $ 94.88  
Stock options exercisable at end of period, weighted average contractual life remaining (in years) 4 years 8 months 12 days  
Stock options exercisable at end of period, aggregate intrinsic value $ 217  
Total compensation cost recognized in earnings for all share-based incentive compensation awards 45 $ 44
Tax benefit recognized in earnings related to compensation costs 8 $ 8
Total unrecognized compensation cost related to all nonvested share-based incentive compensation awards $ 235  
Weighted-average period of recognition for unrecognized compensation cost (in years) 2 years 2 months 12 days