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Share-Based Incentive Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Share-Based Payment Arrangement [Abstract]        
Stock options vested at end of period, number (in shares) 7,420,703   7,420,703  
Stock options vested at end of period, weighted average exercise price (in dollars per share) $ 137.92   $ 137.92  
Stock options vested at end of period, weighted average contractual life remaining (in years)     5 years 8 months 12 days  
Stock options vested at end of period, aggregate intrinsic value $ 209   $ 209  
Stock options exercisable at end of period, number (in shares) 5,344,583   5,344,583  
Stock options exercisable at end of period, weighted average exercise price (in dollars per share) $ 128.37   $ 128.37  
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 $ 187   $ 187  
Total compensation cost recognized in earnings for all share-based incentive compensation awards 46 $ 41 162 $ 141
Tax benefit recognized in the consolidated statement of income related to compensation costs 8 $ 7 27 $ 24
Total unrecognized compensation cost related to all nonvested share-based incentive compensation awards $ 237   $ 237  
Weighted-average period of recognition for unrecognized compensation cost (in years)     1 year 9 months 18 days