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Debt - Senior Credit Facilities (Details) - Line of Credit - USD ($)
1 Months Ended
Mar. 31, 2020
May 31, 2018
Mar. 31, 2021
Dec. 31, 2019
Revolving Credit Facility        
Debt Instrument [Line Items]        
Maximum borrowing capacity     $ 3,570,000,000 $ 3,600,000,000
Revolving Credit Facility | Base Rate | Minimum        
Debt Instrument [Line Items]        
Basis spread on treasury rate 0.00%      
Revolving Credit Facility | Base Rate | Maximum        
Debt Instrument [Line Items]        
Basis spread on treasury rate 0.75%      
Revolving Credit Facility | LIBOR | Minimum        
Debt Instrument [Line Items]        
Basis spread on treasury rate 1.00%      
Revolving Credit Facility | LIBOR | Maximum        
Debt Instrument [Line Items]        
Basis spread on treasury rate 1.75%      
Term Loan Facility        
Debt Instrument [Line Items]        
Proceeds from borrowings on loan facility   $ 3,000,000,000.00