v3.25.1
Debt Obligations - Summary of Debt Obligations (Details) - USD ($)
 3 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Line of Credit Facility [Line Items]    
Carrying Value $ 1,948,000,000 $ 1,833,000,000
Senior Notes    
Line of Credit Facility [Line Items]    
Carrying Value $ 993,000,000 993,000,000
Senior Notes | Senior Notes Due 2029    
Line of Credit Facility [Line Items]    
Stated interest rate 4.95%  
Term 10 years  
Principal $ 500,000,000  
(Unamortized Cost) / Fair Value Adjustments (3,000,000) (3,000,000)
Carrying Value $ 497,000,000 497,000,000
Senior Notes | Senior Notes, Due 2031    
Line of Credit Facility [Line Items]    
Stated interest rate 3.10%  
Term 10 years  
Principal $ 500,000,000  
(Unamortized Cost) / Fair Value Adjustments (4,000,000) (4,000,000)
Carrying Value 496,000,000 496,000,000
Junior Subordinated Debt    
Line of Credit Facility [Line Items]    
Carrying Value $ 955,000,000 840,000,000
Junior Subordinated Debt | Junior Subordinated Notes Due 2040    
Line of Credit Facility [Line Items]    
Stated interest rate 5.75%  
Term 20 years  
Principal $ 117,000,000 350,000,000
(Unamortized Cost) / Fair Value Adjustments (1,000,000) (4,000,000)
Carrying Value $ 116,000,000 346,000,000
Junior Subordinated Debt | Junior Subordinated Notes Due 2042    
Line of Credit Facility [Line Items]    
Stated interest rate 5.50%  
Term 20 years  
Principal $ 500,000,000  
(Unamortized Cost) / Fair Value Adjustments (6,000,000) (6,000,000)
Carrying Value $ 494,000,000 494,000,000
Junior Subordinated Debt | Junior Subordinated Notes Due 2045    
Line of Credit Facility [Line Items]    
Stated interest rate 7.50%  
Term 20 years  
Principal $ 350,000,000  
(Unamortized Cost) / Fair Value Adjustments (5,000,000) 0
Carrying Value $ 345,000,000 0
Line of Credit | EGL Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Term 5 years  
Carrying Value $ 0 $ 0