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Fair Value, Significant Unobservable Inputs (Details) $ in Millions | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
--- | --- | ---
Quantitative Information About the Significant Unobservable Inputs [Abstract] |  |
Estimated fair value | $ 45,069 | $ 44,646
Level 3 [Member] | Fixed Maturity Securities [Member] |  |
Quantitative Information About the Significant Unobservable Inputs [Abstract] |  |
Estimated fair value | $ 1,154 | $ 966
Level 3 [Member] | Fixed Maturity Securities [Member] | Credit Spread [Member] | Discounted Cash Flow [Member] | Minimum [Member] |  |
Quantitative Information About the Significant Unobservable Inputs [Abstract] |  |
Measurement input | 0.01 | 0.01
Level 3 [Member] | Fixed Maturity Securities [Member] | Credit Spread [Member] | Discounted Cash Flow [Member] | Maximum [Member] |  |
Quantitative Information About the Significant Unobservable Inputs [Abstract] |  |
Measurement input | 0.07 | 0.08
Level 3 [Member] | Fixed Maturity Securities [Member] | Credit Spread [Member] | Discounted Cash Flow [Member] | Weighted Average [Member] |  |
Quantitative Information About the Significant Unobservable Inputs [Abstract] |  |
Measurement input | 0.02 | 0.03

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