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Stock-Based Compensation (RSU Activity) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]    
Beginning Balance 591,929  
Granted 263,911  
Released from restrictions (215,208)  
Forfeited (18,577)  
Ending Balance 622,055  
Vested or expected vest, at end of period 592,068  
Weighted Average Fair Value    
Beginning Balance (in dollars per share) $ 113.74  
Granted (in dollars per share) 120.89  
Released from restrictions (in dollars per share) 142.21  
Forfeited (in dollars per share) 122.32  
Ending Balance (in dollars per share) 125.92  
Vested or expected to vest, at end of period (in dollars per share) $ 125.60  
Intrinsic Value (in millions)    
Outstanding $ 78 $ 67
Vested or expected to vest, at end of period $ 73  
Restricted Stock Units (RSUs)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Cost not yet recognized, period for recognition 1 year 6 months