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Fair Value, Quantitative Information about Significant Unobservable Inputs Utilized by Company in Fair Value Measurements of Level 3 Assets (Details) $ in Millions | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
--- | --- | ---
Quantitative Information About the Significant Unobservable Inputs [Abstract] |  |
Estimated fair value | $ 40,124 | $ 42,240
Level 3 [Member] | Fixed Maturity Securities [Member] |  |
Quantitative Information About the Significant Unobservable Inputs [Abstract] |  |
Estimated fair value | $ 583 | $ 525
Debt Securities, Available-for-sale, Valuation Technique [Extensible List] | us-gaap:ValuationTechniqueDiscountedCashFlowMember | us-gaap:ValuationTechniqueDiscountedCashFlowMember
Debt Securities, Available-for-sale, Measurement Input [Extensible List] | us-gaap:MeasurementInputCreditSpreadMember | us-gaap:MeasurementInputCreditSpreadMember
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 | 0.10 | 0.06
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 | 0.04 | 0.02

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