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Debt - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended
Jun. 30, 2025
Apr. 30, 2025
Apr. 01, 2025
Mar. 31, 2025
Jan. 31, 2025
Dec. 31, 2024
Debt Instrument [Line Items]            
Outstanding indebtedness, excluding fair value adjustments, debt issuance costs and debt discounts $ 46,400,000          
Debt instrument, unamortized discount (premium) and debt issuance costs, net 242,936         $ 242,984
Undrawn amounts 11,258,746          
Debt 46,113,492         $ 45,294,511
Unsecured            
Debt Instrument [Line Items]            
Undrawn amounts 9,570,000          
Subordinated            
Debt Instrument [Line Items]            
Undrawn amounts $ 0          
4.875% Senior Unsecured Debt Due 2028 | Unsecured            
Debt Instrument [Line Items]            
Face amount         $ 750,000  
Interest rate (in percentage)         4.875%  
5.375% Senior Unsecured Debt Due 2031 | Unsecured            
Debt Instrument [Line Items]            
Face amount         $ 750,000  
Interest rate (in percentage)         5.375%  
2056 AGAT/AICDC Junior Subordinated Notes | Unsecured            
Debt Instrument [Line Items]            
Face amount   $ 500,000        
Interest rate (in percentage)   6.50%        
Spread over reference rate   2.441%        
Debt, reset period, duration   5 years        
2045 Junior Subordinated Notes | Subordinated            
Debt Instrument [Line Items]            
Interest rate (in percentage) 6.50%          
Repayments of debt $ 500,000          
Percentage of principal amount redeemed 100.00%          
Unsecured Term Loan | Line of Credit | Unsecured            
Debt Instrument [Line Items]            
Face amount     $ 1,500,000 $ 545,000    
Debt instrument, prepayment amount   $ 850,000