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	$ 4,955	$ 5,482
Fixed maturity AFS securities
Financial Instruments Owned and Pledged as Collateral [Line Items]
Total assets pledged as collateral	3,578	1,737
Trading securities
Financial Instruments Owned and Pledged as Collateral [Line Items]
Total assets pledged as collateral	14	24
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	71	68
Cash and invested cash
Financial Instruments Owned and Pledged as Collateral [Line Items]
Total assets pledged as collateral	$ 65	$ 111