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Commitment and Contingencies - Credit Agreements (Details) - USD ($)
1 Months Ended 12 Months Ended
Nov. 30, 2019
Dec. 31, 2022
Dec. 31, 2021
Aug. 31, 2020
Line of Credit Facility [Line Items]        
Letters of credit outstanding   $ 132,000,000 $ 60,000,000  
Revolving Credit Facility | Unsecured Revolving Credit Facility Maturing November 19, 2024        
Line of Credit Facility [Line Items]        
Revolving credit facility, maximum borrowing capacity $ 300,000,000      
Unused commitment fee (percent) 0.10%      
Revolving Credit Facility | Unsecured Revolving Credit Facility Maturing November 19, 2024 | Higher of Federal Funds Rate or Composite Overnight Bank Borrowing Rate        
Line of Credit Facility [Line Items]        
Basis spread on variable rate (percent) 0.50%      
Revolving Credit Facility | Unsecured Revolving Credit Facility Maturing November 19, 2024 | Adjusted One-month LIBOR        
Line of Credit Facility [Line Items]        
Basis spread on variable rate (percent) 1.00%      
Revolving Credit Facility | Unsecured Revolving Credit Facility Maturing November 19, 2024 | Adjusted LIBOR        
Line of Credit Facility [Line Items]        
Basis spread on variable rate (percent) 1.00%      
Revolving Credit Facility | Amended and Restated Revolving Credit and Guaranty Agreement Maturing August 7, 2025        
Line of Credit Facility [Line Items]        
Revolving credit facility, maximum borrowing capacity       $ 400,000,000
Incremental revolving loan commitments       $ 100,000,000
Drawn from the revolving credit facility   0 0  
Letters of credit outstanding   $ 99,000,000 $ 39,000,000