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Fair Value - Significant Unobservable Inputs (Details) $ in Millions | Sep. 30, 2022 USD ($) | Dec. 31, 2021 USD ($)
--- | --- | ---
Quantitative Information About the Significant Unobservable Inputs [Abstract] |  |
Estimated Fair Value | $ 37,504 | $ 44,380
Level 3 | Fixed maturity securities |  |
Quantitative Information About the Significant Unobservable Inputs [Abstract] |  |
Estimated Fair Value | $ 1,111 | $ 1,225
Debt Securities, Available-for-sale, Valuation Technique [Extensible List] | Discounted cash flow | Discounted cash flow
Debt Securities, Available-for-sale, Measurement Input [Extensible List] | Credit spread | Credit spread
Credit spread | Minimum | Level 3 | Fixed maturity securities | Discounted cash flow |  |
Quantitative Information About the Significant Unobservable Inputs [Abstract] |  |
Measurement input | 0.01 | 0.01
Credit spread | Maximum | Level 3 | Fixed maturity securities | Discounted cash flow |  |
Quantitative Information About the Significant Unobservable Inputs [Abstract] |  |
Measurement input | 0.11 | 0.07
Credit spread | Weighted Average | Level 3 | Fixed maturity securities | Discounted cash flow |  |
Quantitative Information About the Significant Unobservable Inputs [Abstract] |  |
Measurement input | 0.03 | 0.02

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