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Share-Based Incentive Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Share-based Payment Arrangement [Abstract]    
Stock options vested at end of period, number (in shares) 7,437,915  
Stock options vested at end of period, weighted average exercise price (in dollars per share) $ 130.41  
Stock options vested at end of period, weighted average contractual life remaining (in years) 6 years 6 months  
Stock options vested at end of period, aggregate intrinsic value $ 389  
Stock options exercisable at end of period, number (in shares) 4,607,372  
Stock options exercisable at end of period, weighted average exercise price (in dollars per share) $ 122.31  
Stock options exercisable at end of period, weighted average contractual life remaining (in years) 5 years 2 months 12 days  
Stock options exercisable at end of period, aggregate intrinsic value $ 278  
Total compensation cost recognized in earnings for all share-based incentive compensation awards 59 $ 53
Tax benefit recognized in earnings related to compensation costs 10 $ 9
Total unrecognized compensation cost related to all nonvested share-based incentive compensation awards $ 278  
Weighted-average period of recognition for unrecognized compensation cost (in years) 2 years 2 months 12 days