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Share-Based Payments (Summary of Restricted Stock Unit Activity) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
2 Months Ended 12 Months Ended
Feb. 28, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Restricted Stock Units (RSUs)        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   $ 180    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition   1 year 9 months 18 days    
Outstanding at January 1, 2019   3.7    
Granted   1.0    
Converted   (1.6)    
Forfeited   (0.2)    
Outstanding at December 31, 2019   2.9 3.7  
Units vested and expected to vest at December 31, 2019   2.8    
Weighted-average grant-date fair value, units outstanding at January 1, 2019   $ 117    
Weighted-average grant-date fair value, granted   226 $ 171 $ 112
Weighted-average grant-date fair value, converted   93    
Weighted-average grant-date fair value, forfeited/expired   154    
Weighted-average grant-date fair value, units outstanding at December 31, 2019   166 $ 117  
Weighted-average grant-date fair value, units vested and expected to vest at December 31, 2019   $ 165    
Aggregate intrinsic value, units outstanding at December 31, 2019   $ 852    
Aggregate intrinsic value, units vested and expected to vest at December 31, 2019   $ 824    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years    
Performance stock units        
Outstanding at January 1, 2019   0.6    
Granted   0.1    
Converted   (0.4)    
Outstanding at December 31, 2019   0.5 0.6  
Units vested and expected to vest at December 31, 2019   0.5    
Weighted-average grant-date fair value, units outstanding at January 1, 2019   $ 120    
Weighted-average grant-date fair value, granted   231 $ 226 $ 126
Weighted-average grant-date fair value, converted   92    
Weighted-average grant-date fair value, units outstanding at December 31, 2019   167 $ 120  
Weighted-average grant-date fair value, units vested and expected to vest at December 31, 2019   $ 167    
Aggregate intrinsic value, units outstanding at December 31, 2019   $ 162    
Aggregate intrinsic value, units vested and expected to vest at December 31, 2019   $ 162    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years    
Equity Option [Member]        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   $ 34    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition   2 years 3 months 18 days    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   4 years    
Minimum vesting from date of retirement eligibility | Performance stock units        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 6 months 7 months