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Share-Based Incentive Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share-based Payment Arrangement [Abstract]        
Stock options vested at end of period, number (in shares) 7,488,449   7,488,449  
Stock options vested at end of period, weighted average exercise price (in dollars per share) $ 114.26   $ 114.26  
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 $ 56   $ 56  
Stock options exercisable at end of period, number (in shares) 5,167,407   5,167,407  
Stock options exercisable at end of period, weighted average exercise price (in dollars per share) $ 106.08   $ 106.08  
Stock options exercisable at end of period, weighted average contractual life remaining (in years)     4 years 6 months  
Stock options exercisable at end of period, aggregate intrinsic value $ 56   $ 56  
Total compensation cost recognized in earnings for all share-based incentive compensation awards 34 $ 35 80 $ 80
Tax benefit recognized in earnings related to compensation costs 6 $ 6 14 $ 14
Total unrecognized compensation cost related to all nonvested share-based incentive compensation awards $ 198   $ 198  
Weighted-average period of recognition for unrecognized compensation cost (in years)     2 years