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Share-Based Incentive Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-based Payment Arrangement [Abstract]        
Stock options vested at end of period, number (in shares) 7,474,888   7,474,888  
Stock options vested at end of period, weighted average exercise price (in dollars per share) $ 114.76   $ 114.76  
Stock options vested at end of period, weighted average contractual life remaining (in years)     5 years 6 months  
Stock options vested at end of period, aggregate intrinsic value $ 36   $ 36  
Stock options exercisable at end of period, number (in shares) 5,210,232   5,210,232  
Stock options exercisable at end of period, weighted average exercise price (in dollars per share) $ 107.04   $ 107.04  
Stock options exercisable at end of period, weighted average contractual life remaining (in years)     4 years 2 months 12 days  
Stock options exercisable at end of period, aggregate intrinsic value $ 36   $ 36  
Total compensation cost recognized in earnings for all share-based incentive compensation awards 33 $ 32 113 $ 112
Tax benefit recognized in earnings related to compensation costs 6 $ 6 20 $ 20
Total unrecognized compensation cost related to all nonvested share-based incentive compensation awards $ 165   $ 165  
Weighted-average period of recognition for unrecognized compensation cost (in years)     1 year 9 months 18 days