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Fair Value - Significant Unobservable Inputs (Details) $ in Millions | Sep. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | ---
Quantitative Information About the Significant Unobservable Inputs [Abstract] |  |
Estimated Fair Value | $ 43,055 | $ 40,626
Level 3 | Fixed maturity securities |  |
Quantitative Information About the Significant Unobservable Inputs [Abstract] |  |
Estimated Fair Value | $ 1,713 | $ 1,495
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
Level 3 | Fixed maturity securities | Credit spread | Discounted cash flow | Minimum |  |
Quantitative Information About the Significant Unobservable Inputs [Abstract] |  |
Measurement input (as a percent) | 0.01 | 0.01
Level 3 | Fixed maturity securities | Credit spread | Discounted cash flow | Maximum |  |
Quantitative Information About the Significant Unobservable Inputs [Abstract] |  |
Measurement input (as a percent) | 0.06 | 0.07
Level 3 | Fixed maturity securities | Credit spread | Discounted cash flow | Weighted Average |  |
Quantitative Information About the Significant Unobservable Inputs [Abstract] |  |
Measurement input (as a percent) | (0.02) | (0.02)

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