v3.25.2
Debt - Additional Information (Details)
6 Months Ended
Mar. 29, 2024
USD ($)
extension_option
Jun. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Jun. 30, 2024
USD ($)
Debt Instrument [Line Items]        
Activity-based common stock ownership percentage   0.041    
FHLB stock   $ 33,000,000 $ 34,000,000  
Short-term debt, face amount   467,000,000    
Estimate of Fair Value Measurement | Asset Pledged as Collateral        
Debt Instrument [Line Items]        
Fair value of pledged assets   1,300,000,000    
FHLB borrowings        
Debt Instrument [Line Items]        
Short-term debt, face amount   70,000,000   $ 180,000,000
Line of Credit        
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 1,000,000,000 1,000,000,000    
Potential maximum borrowing capacity   $ 1,250,000,000    
Number of extension options | extension_option 2      
Extension term 1 year      
Junior Subordinated Debentures Due 2056        
Debt Instrument [Line Items]        
Interest rate   4.25%    
Senior Notes        
Debt Instrument [Line Items]        
Optional redemption, period from issuance date   5 years    
FHLB borrowings        
Debt Instrument [Line Items]        
Maximum borrowing capacity   $ 649,000,000    
Long-term line of credit   $ 397,000,000 $ 372,000,000