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Share-Based Incentive Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Stock options vested at end of period, number (in shares) 6,135,747   6,135,747  
Stock options vested at end of period, weighted average exercise price (in dollars per share) $ 98.60   $ 98.60  
Stock options vested at end of period, weighted average contractual life remaining (in years)     6 years  
Stock options vested at end of period, aggregate intrinsic value $ 158   $ 158  
Stock options exercisable at end of period, number (in shares) 3,850,199   3,850,199  
Stock options exercisable at end of period, weighted average exercise price (in dollars per share) $ 85.96   $ 85.96  
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 $ 140   $ 140  
Total compensation cost recognized in earnings for all share-based incentive compensation awards 33 $ 31 77 $ 73
Tax benefit recognized in earnings related to compensation costs 6 $ 10 14 $ 24
Total unrecognized compensation cost related to all nonvested share-based incentive compensation awards $ 201   $ 201  
Weighted-average period of recognition for unrecognized compensation cost (in years)     2 years