v3.26.1
Borrowings and Financing Activities - Additional Information (Details)
$ in Millions
3 Months Ended 5 Months Ended 6 Months Ended
Mar. 31, 2026
USD ($)
Jun. 30, 2026
USD ($)
Jun. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
Debt Instrument [Line Items]        
Investment, Type [Extensible Enumeration]   Fixed Maturities [Member] Fixed Maturities [Member]  
Letters of credit issued and outstanding   $ 620 $ 620  
Letter of Credit        
Debt Instrument [Line Items]        
Line of Credit   620 620  
Total fixed-maturities available for sale        
Debt Instrument [Line Items]        
FHLB, collateral pledged   $ 91 $ 91 $ 43
Investment, Type [Extensible Enumeration]   Fixed Maturities AFS and Trading Securities [Member] Fixed Maturities AFS and Trading Securities [Member] Fixed Maturities AFS and Trading Securities [Member]
FHLB Advances | Minimum        
Debt Instrument [Line Items]        
FHLB, ratio of market value of collateral to advances     103  
FHLB Advances | Maximum        
Debt Instrument [Line Items]        
FHLB, ratio of market value of collateral to advances     114  
Revolving Credit Facility        
Debt Instrument [Line Items]        
Borrowed debt $ 200      
Repayment of debt   $ 125    
Revolving Credit Facility | Unsecured Revolving Credit Facility, Expiration Date 2026        
Debt Instrument [Line Items]        
Current borrowing capacity   $ 500 $ 500