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Share-Based Incentive Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Stock options vested at end of period, number (in shares) 6,120,874   6,120,874  
Stock options vested at end of period, weighted average exercise price (in dollars per share) $ 105.70   $ 105.70  
Stock options vested at end of period, weighted average contractual life remaining (in years)     5 years 9 months 18 days  
Stock options vested at end of period, aggregate intrinsic value $ 268   $ 268  
Stock options exercisable at end of period, number (in shares) 4,202,289   4,202,289  
Stock options exercisable at end of period, weighted average exercise price (in dollars per share) $ 95.63   $ 95.63  
Stock options exercisable at end of period, weighted average contractual life remaining (in years)     4 years 6 months  
Stock options exercisable at end of period, aggregate intrinsic value $ 226   $ 226  
Total compensation cost recognized in earnings for all share-based incentive compensation awards 35 $ 33 80 $ 77
Tax benefit recognized in earnings related to compensation costs 6 $ 6 14 $ 14
Total unrecognized compensation cost related to all nonvested share-based incentive compensation awards $ 202   $ 202  
Weighted-average period of recognition for unrecognized compensation cost (in years)     2 years