v3.25.1
Debt Obligations - Narrative (Details)
3 Months Ended
Apr. 01, 2035
day
Sep. 01, 2025
Mar. 31, 2025
USD ($)
day
Dec. 31, 2024
USD ($)
Line of Credit Facility [Line Items]        
Carrying Value     $ 1,948,000,000 $ 1,833,000,000
Junior Subordinated Debt        
Line of Credit Facility [Line Items]        
Carrying Value     955,000,000 840,000,000
Junior Subordinated Notes Due 2045 | Junior Subordinated Debt        
Line of Credit Facility [Line Items]        
Principal     $ 350,000,000  
Stated interest rate     7.50%  
Proceeds from issuance of subordinated debt     $ 345,000,000  
Debt issuance costs     5,000,000  
Carrying Value     345,000,000 0
Junior Subordinated Notes Due 2045 | Junior Subordinated Debt | Forecast        
Line of Credit Facility [Line Items]        
Number of business days prior to beginning of five-year period | day 2      
Basis spread on interest rate 3.186%      
Junior Subordinated Notes Due 2040 | Junior Subordinated Debt        
Line of Credit Facility [Line Items]        
Principal     $ 117,000,000 350,000,000
Stated interest rate     5.75%  
Number of business days prior to beginning of five-year period | day     2  
Repurchase amount     $ 233,000,000  
Loss on extinguishment of debt     3,000,000  
Carrying Value     $ 116,000,000 $ 346,000,000
Redemption price percentage     100.00%  
Junior Subordinated Notes Due 2040 | Junior Subordinated Debt | Forecast        
Line of Credit Facility [Line Items]        
Basis spread on interest rate   5.468%