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Fair Value (Quantitative information about significant unobservable inputs in the fair value measurement of level 3 assets) (Details) $ in Millions | Sep. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
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Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Estimated fair value | $ 40,339 | $ 39,980
Fixed maturity securities | Discounted cash flow |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Estimated fair value | $ 1,359 | $ 1,177
Credit spread | Discounted cash flow | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt securities, available-for-sale, measurement Input | 0.01 | 0.01
Credit spread | Discounted cash flow | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt securities, available-for-sale, measurement Input | 0.07 | 0.08
Credit spread | Discounted cash flow | Weighted Average |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt securities, available-for-sale, measurement Input | 0.02 | 0.02

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