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Share-Based Incentive Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Share-based Payment Arrangement [Abstract]        
Stock options vested at end of period, number (in shares) 6,001,876   6,001,876  
Stock options vested at end of period, weighted average exercise price (in dollars per share) $ 106.47   $ 106.47  
Stock options vested at end of period, weighted average contractual life remaining (in years)     5 years 7 months 6 days  
Stock options vested at end of period, aggregate intrinsic value $ 253   $ 253  
Stock options exercisable at end of period, number (in shares) 4,039,266   4,039,266  
Stock options exercisable at end of period, weighted average exercise price (in dollars per share) $ 96.13   $ 96.13  
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 $ 212   $ 212  
Total compensation cost recognized in earnings for all share-based incentive compensation awards 32 $ 33 112 $ 110
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 $ 169   $ 169  
Weighted-average period of recognition for unrecognized compensation cost (in years)     1 year 9 months 18 days