v3.22.4
Share-Based Payments (Summary of Restricted Stock Unit and Performance Stock Activity) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding beginning of period 2.2    
Granted 1.0    
Converted (1.2)    
Forfeited (0.2)    
Outstanding end of period 1.8 2.2  
RSUs units expected to vest at the end of the period 1.8    
Weighted-Average Grant-Date Fair Value      
Weighted-average grant-date fair value, units outstanding, beginning of period $ 291    
Weighted-average grant-date fair value, granted 340 $ 358 $ 288
Weighted-average grant-date fair value, converted 258    
Weighted-average grant-date fair value, forfeited/expired 332    
Weighted-average grant-date fair value, units outstanding, end of period 335 $ 291  
Weighted-average grant-date fair value, units vested and expected to vest at the end of the period $ 335    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Abstract]      
Aggregate intrinsic value, units outstanding at the end of the period $ 641    
Aggregate intrinsic value, units expected to vest at the end of the period $ 615    
Performance stock units      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding beginning of period 0.4    
Granted 0.2    
Converted 0.0    
Other (0.2)    
Outstanding end of period 0.4 0.4  
RSUs units expected to vest at the end of the period 0.4    
Weighted-Average Grant-Date Fair Value      
Weighted-average grant-date fair value, units outstanding, beginning of period $ 334    
Weighted-average grant-date fair value, granted 335 $ 385 $ 291
Weighted-average grant-date fair value, converted 0    
Weighted-average grant-date fair value, other 291    
Weighted-average grant-date fair value, units outstanding, end of period 352 $ 334  
Weighted-average grant-date fair value, units vested and expected to vest at the end of the period $ 352    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Abstract]      
Aggregate intrinsic value, units outstanding at the end of the period $ 128    
Aggregate intrinsic value, units expected to vest at the end of the period $ 128