Fair Value (Quantitative information about significant unobservable inputs in the fair value measurement of level 3 assets) (Details) - Discounted cash flow $ in Millions	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fixed maturity securities	$ 1,927	$ 1,724
Credit spread | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt securities, available-for-sale, measurement Input	0.01	0.01
Credit spread | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt securities, available-for-sale, measurement Input	0.11	0.06
Credit spread | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt securities, available-for-sale, measurement Input	0.02	0.02