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Debt - Commercial Paper and Credit Agreement (Details)
1 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Nov. 30, 2015
USD ($)
Debt Instrument [Line Items]        
Allowable increase in borrowing capacity, maximum $ 1,000,000,000      
Maximum consolidated leverage ratio   4.0    
Maximum consolidated leverage ratio following a material acquisition   4.5    
Commercial Paper        
Debt Instrument [Line Items]        
Amount outstanding   $ 0 $ 0  
Commercial Paper | Maximum        
Debt Instrument [Line Items]        
Debt term   397 days    
Commercial Paper | Revolving Credit Facility        
Debt Instrument [Line Items]        
Borrowing capacity reserved, commercial paper   $ 1,500,000,000    
Unsecured Debt | Revolving Credit Facility        
Debt Instrument [Line Items]        
Debt term 5 years      
Amount outstanding   0    
Maximum borrowing capacity $ 2,000,000,000     $ 2,000,000,000
Remaining borrowing capacity   $ 2,000,000,000