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Debt - Commercial Paper and Credit Agreement (Details)
1 Months Ended 3 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2021
USD ($)
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   $ 400,000,000  
Weighted average interest rate   0.20%  
Weighted average remaining term   25 days  
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   $ 1,600,000,000