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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, 2021 USD ($) | Dec. 31, 2020 USD ($)
--- | --- | ---
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Estimated Fair Value (In millions) | $ 47,106 | $ 47,412
Fixed maturity securities | Income Approach Valuation Technique |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Estimated Fair Value (In millions) | $ 1,154 | $ 966
Measurement Input, Credit Spread | Income Approach Valuation Technique | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Range (Weighted Average) | 0.01 | 0.01
Measurement Input, Credit Spread | Income Approach Valuation Technique | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Range (Weighted Average) | 0.07 | 0.08
Measurement Input, Credit Spread | Income Approach Valuation Technique | Weighted Average |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Range (Weighted Average) | 0.02 | 0.03

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