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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, 2024
Dec. 31, 2023
Dec. 31, 2022
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 (in shares) 2.2    
Granted (in shares) 1.0    
Converted (in shares) (1.0)    
Forfeited (in shares) (0.1)    
Outstanding, end of period (in shares) 2.1 2.2  
Units expected to vest at the end of the period 2.0    
Weighted-Average Grant-Date Fair Value      
Weighted-average grant-date fair value, units outstanding, beginning of period $ 344    
Weighted-average grant-date fair value, granted 472 $ 350 $ 340
Weighted-average grant-date fair value, converted 338    
Weighted-average grant-date fair value, forfeited 391    
Weighted-average grant-date fair value, units outstanding, end of period 403 $ 344  
Weighted-average grant-date fair value, units vested and expected to vest at the end of the period $ 403    
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 $ 1,081    
Aggregate intrinsic value, units expected to vest at the end of the period $ 1,034    
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 (in shares) 0.6    
Granted (in shares) 0.2    
Converted (in shares) (0.3)    
Other (in shares) 0.1    
Outstanding, end of period (in shares) 0.6 0.6  
Units expected to vest at the end of the period 0.6    
Weighted-Average Grant-Date Fair Value      
Weighted-average grant-date fair value, units outstanding, beginning of period $ 365    
Weighted-average grant-date fair value, granted 512 $ 365 $ 335
Weighted-average grant-date fair value, converted 385    
Weighted-average grant-date fair value, other 335    
Weighted-average grant-date fair value, units outstanding, end of period 396 $ 365  
Weighted-average grant-date fair value, units vested and expected to vest at the end of the period $ 396    
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 $ 325    
Aggregate intrinsic value, units expected to vest at the end of the period $ 321