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DEBT - Five-Year Revolving Credit Facility (Details) - Credit Agreement - Unsecured Debt - USD ($)
1 Months Ended 12 Months Ended
May 31, 2020
Mar. 31, 2020
Sep. 30, 2019
Dec. 31, 2020
Dec. 31, 2022
Revolving Credit Facility          
Line of Credit Facility [Line Items]          
Credit facility, term (in years)     5 years    
Maximum borrowing capacity     $ 5,000,000,000    
Increase limit     $ 2,000,000,000    
Proceeds from additional drew down on credit facility   $ 3,000,000,000      
Repayments on termination of credit facility $ 3,000,000,000        
Borrowings outstanding         $ 0
Remaining borrowing capacity         $ 5,000,000,000
Interest expense and fees       $ 16,000,000  
Revolving Credit Facility | Minimum | Eurodollar          
Line of Credit Facility [Line Items]          
Basis spread on variable rate     0.875%    
Revolving Credit Facility | Minimum | Overnight Rate          
Line of Credit Facility [Line Items]          
Basis spread on variable rate     0.875%    
Revolving Credit Facility | Minimum | Prime Rate, The Federal Funds Effective Rate Or London Interbank Offered Rate (LIBOR)          
Line of Credit Facility [Line Items]          
Basis spread on variable rate     0.00%    
Revolving Credit Facility | Minimum | Euro Short-Term Rate (ESTR) or Sterling Overnight Index Average (SONIA)          
Line of Credit Facility [Line Items]          
Basis spread on variable rate     0.875%    
Revolving Credit Facility | Maximum | Eurodollar          
Line of Credit Facility [Line Items]          
Basis spread on variable rate     1.375%    
Revolving Credit Facility | Maximum | Overnight Rate          
Line of Credit Facility [Line Items]          
Basis spread on variable rate     1.375%    
Revolving Credit Facility | Maximum | Prime Rate, The Federal Funds Effective Rate Or London Interbank Offered Rate (LIBOR)          
Line of Credit Facility [Line Items]          
Basis spread on variable rate     0.375%    
Revolving Credit Facility | Maximum | Euro Short-Term Rate (ESTR) or Sterling Overnight Index Average (SONIA)          
Line of Credit Facility [Line Items]          
Basis spread on variable rate     1.375%    
Letter of Credit          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity     $ 150,000,000    
Bridge Loan          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity     $ 500,000,000