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Investments - Assets Pledged as Collateral (Details) - Asset Pledged as Collateral - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Total assets pledged as collateral $ 4,901 $ 5,432
Fixed maturity AFS securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Total assets pledged as collateral 3,577 1,736
Trading securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Total assets pledged as collateral 14 23
Equity securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Total assets pledged as collateral 10 12
Mortgage loans on real estate    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Total assets pledged as collateral 1,217 3,530
Other investments    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Total assets pledged as collateral 20 21
Cash and invested cash    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Total assets pledged as collateral $ 63 $ 110