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Stockbased Compensation, Restricted Units Disclosures (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Unvested Restricted Units [Roll Forward]      
Unvested Restricted Units, Beginning Balance 0.8    
Granted 0.4    
Issued in connection with an acquisition 0.2    
Vested (0.5)    
Forfeited (0.1)    
Unvested Restricted Units, Ending Balance 0.8 0.8  
Restricted Units, Additional Disclosures [Abstract]      
Unvested Restricted Units, Weighted Average Grant Date Fair Value, Beginning Balance (in dollars per share) $ 276.74    
Granted, Weighted Average Grant Date Fair Value (in dollars per share) 444.61    
Issued in Connection with an Acquisition, Weighted Average Grant Date Fair Value (in dollars per share) 628.71    
Vested, Weighted Average Grant Date Fair Value (in dollars per share) 295.70    
Forfeited, Weighted Average Grant Date Fair Value (in dollars per share) 326.90    
Unvested Restricted Units, Weighted Average Grant Date Fair Value, Ending Balance (in dollars per share) $ 425.39 $ 276.74  
Fair Value of Units Vested $ 151 $ 126 $ 118
Restricted Stock Units (RSUs) [Member]      
Restricted Units, Additional Disclosures [Abstract]      
Unrecognized Compensation Costs On Nonvested Awards $ 250    
Unrecognized Compensation Costs On Nonvested Awards, Weighted Average Period Of Recognition 2 years 1 month 6 days    
Restricted Stock Units (RSUs) [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award Requisite Service Period 3 years    
Restricted Stock Units (RSUs) [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award Requisite Service Period 4 years