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Share-Based Incentive Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Share-based Payment Arrangement [Abstract]        
Stock options vested at end of period, number (in shares) 7,604,850   7,604,850  
Stock options vested at end of period, weighted average exercise price (in dollars per share) $ 123.90   $ 123.90  
Stock options vested at end of period, weighted average contractual life remaining (in years)     6 years 4 months 24 days  
Stock options vested at end of period, aggregate intrinsic value $ 196   $ 196  
Stock options exercisable at end of period, number (in shares) 4,401,105   4,401,105  
Stock options exercisable at end of period, weighted average exercise price (in dollars per share) $ 117.65   $ 117.65  
Stock options exercisable at end of period, weighted average contractual life remaining (in years)     4 years 10 months 24 days  
Stock options exercisable at end of period, aggregate intrinsic value $ 141   $ 141  
Total compensation cost recognized in earnings for all share-based incentive compensation awards 36 $ 34 89 $ 80
Tax benefit recognized in earnings related to compensation costs 6 $ 6 15 $ 14
Total unrecognized compensation cost related to all nonvested share-based incentive compensation awards $ 212   $ 212  
Weighted-average period of recognition for unrecognized compensation cost (in years)     2 years