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Share-Based Incentive Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]        
Stock options vested at end of period, number (in shares) 7,292,324   7,292,324  
Stock options vested at end of period, weighted average exercise price (in dollars per share) $ 124.13   $ 124.13  
Stock options vested at end of period, weighted average contractual life remaining (in years)     6 years 1 month 6 days  
Stock options vested at end of period, aggregate intrinsic value $ 203   $ 203  
Stock options exercisable at end of period, number (in shares) 4,340,430   4,340,430  
Stock options exercisable at end of period, weighted average exercise price (in dollars per share) $ 118.45   $ 118.45  
Stock options exercisable at end of period, weighted average contractual life remaining (in years)     4 years 7 months 6 days  
Stock options exercisable at end of period, aggregate intrinsic value $ 146   $ 146  
Total compensation cost recognized in earnings for all share-based incentive compensation awards 37 $ 33 126 $ 113
Tax benefit recognized in earnings related to compensation costs 7 $ 6 22 $ 20
Total unrecognized compensation cost related to all nonvested share-based incentive compensation awards $ 184   $ 184  
Weighted-average period of recognition for unrecognized compensation cost (in years)     1 year 10 months 24 days