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Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Quantitative Information for Level 3 Inputs) (Details) $ in Millions | Sep. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
--- | --- | ---
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Assets, Fair Value Disclosure | $ (55,775) | [1] | $ (54,567) | [2]
Corporate Debt Securities [Member] | Valuation, Market Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Assets, Fair Value Disclosure | $ (82) |  | $ (25) |
Corporate Debt Securities [Member] | Weighted Average [Member] | Valuation, Market Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Debt Instrument, Measurement Input | 0.01 |  |  |
Corporate Debt Securities [Member] | Maximum [Member] | Valuation, Market Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Debt Instrument, Measurement Input | 0.02 |  | 0.01 |
Corporate Debt Securities [Member] | Minimum [Member] | Valuation, Market Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Debt Instrument, Measurement Input | 0 |  |  |
Asset-backed Securities [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Assets, Fair Value Disclosure | $ (266) |  | $ (274) |
Asset-backed Securities [Member] | Weighted Average [Member] | Valuation, Market Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Debt Instrument, Measurement Input | 0.02 |  | 0.02 |
Asset-backed Securities [Member] | Maximum [Member] | Valuation, Market Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Debt Instrument, Measurement Input | 0.18 |  | 0.18 |
Asset-backed Securities [Member] | Minimum [Member] | Valuation, Market Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Debt Instrument, Measurement Input | 0 |  | 0 |
US Government Agencies Debt Securities [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Assets, Fair Value Disclosure | $ (7) |  | $ (9) |
US Government Agencies Debt Securities [Member] | Weighted Average [Member] | Valuation, Market Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Debt Instrument, Measurement Input | 0.01 |  | 0.01 |
US Government Agencies Debt Securities [Member] | Maximum [Member] | Valuation, Market Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Debt Instrument, Measurement Input | 0.01 |  | 0.01 |
US Government Agencies Debt Securities [Member] | Minimum [Member] | Valuation, Market Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Debt Instrument, Measurement Input | 0 |  | 0 |
Equity securities | Valuation, Market Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Assets, Fair Value Disclosure | $ (20) |  | $ (9) |
Equity securities | Maximum [Member] | Valuation, Market Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Debt Instrument, Measurement Input | 0.04 |  |  |
Funds Withheld At Interest Embedded Derivatives [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Assets, Fair Value Disclosure | $ (17) |  | (34) |
Embedded Derivatives In Indexed Annuity [Member] | Valuation, Income Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | $ 441 |  | $ 530 |
Embedded Derivatives In Indexed Annuity [Member] | Weighted Average [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Embedded Derivative Liability, Measurement Input | 0.02 |  | 0.02 |
Embedded Derivatives In Indexed Annuity [Member] | Maximum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Embedded Derivative Liability, Measurement Input | 0.04 |  | 0.04 |
Embedded Derivatives In Indexed Annuity [Member] | Minimum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Embedded Derivative Liability, Measurement Input | 0.01 |  | 0.01 |
Measurement Input Crediting Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Weighted Average [Member] | Valuation, Income Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Embedded Derivative Asset, Measurement Input | 0.02 |  | 0.02 |
Measurement Input Crediting Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Maximum [Member] | Valuation, Income Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Embedded Derivative Asset, Measurement Input | 0.04 |  | 0.04 |
Measurement Input Crediting Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Minimum [Member] | Valuation, Income Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Embedded Derivative Asset, Measurement Input | 0.01 |  | 0.01 |
Measurement Input, Counterparty Credit Risk [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Weighted Average [Member] | Valuation, Income Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Embedded Derivative Asset, Measurement Input | 0 |  | 0 |
Measurement Input, Counterparty Credit Risk [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Maximum [Member] | Valuation, Income Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Embedded Derivative Asset, Measurement Input | 0.05 |  | 0.05 |
Measurement Input, Counterparty Credit Risk [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Minimum [Member] | Valuation, Income Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Embedded Derivative Asset, Measurement Input | 0 |  | 0 |
Measurement Input, Withdrawal Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Weighted Average [Member] | Valuation, Income Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Embedded Derivative Asset, Measurement Input | 0.04 |  | 0.04 |
Measurement Input, Withdrawal Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Maximum [Member] | Valuation, Income Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Embedded Derivative Asset, Measurement Input | 0.05 |  | 0.05 |
Measurement Input, Withdrawal Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Minimum [Member] | Valuation, Income Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Embedded Derivative Asset, Measurement Input | 0 |  | 0 |
Measurement Input, Withdrawal Rate [Member] | Embedded Derivatives In Indexed Annuity [Member] | Weighted Average [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Embedded Derivative Liability, Measurement Input | 0.04 |  | 0.03 |
Measurement Input, Withdrawal Rate [Member] | Embedded Derivatives In Indexed Annuity [Member] | Maximum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Embedded Derivative Liability, Measurement Input | 0.05 |  | 0.05 |
Measurement Input, Withdrawal Rate [Member] | Embedded Derivatives In Indexed Annuity [Member] | Minimum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Embedded Derivative Liability, Measurement Input | 0 |  | 0 |
Measurement Input, Lapse Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Weighted Average [Member] | Valuation, Income Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Embedded Derivative Asset, Measurement Input | 0.16 |  | 0.17 |
Measurement Input, Lapse Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Maximum [Member] | Valuation, Income Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Embedded Derivative Asset, Measurement Input | 0.35 |  | 0.35 |
Measurement Input, Lapse Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Minimum [Member] | Valuation, Income Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Embedded Derivative Asset, Measurement Input | 0 |  | 0 |
Measurement Input, Lapse Rate [Member] | Embedded Derivatives In Indexed Annuity [Member] | Weighted Average [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Embedded Derivative Liability, Measurement Input | 0.15 |  | 0.16 |
Measurement Input, Lapse Rate [Member] | Embedded Derivatives In Indexed Annuity [Member] | Maximum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Embedded Derivative Liability, Measurement Input | 0.35 |  | 0.35 |
Measurement Input, Lapse Rate [Member] | Embedded Derivatives In Indexed Annuity [Member] | Minimum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Embedded Derivative Liability, Measurement Input | 0 |  | 0 |
Measurement Input, Mortality Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Weighted Average [Member] | Valuation, Income Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Embedded Derivative Asset, Measurement Input | 0.03 |  | 0.03 |
Measurement Input, Mortality Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Maximum [Member] | Valuation, Income Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Embedded Derivative Asset, Measurement Input | 1 |  | 1 |
Measurement Input, Mortality Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Minimum [Member] | Valuation, Income Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Embedded Derivative Asset, Measurement Input | 0 |  | 0 |
Measurement Input, Mortality Rate [Member] | Embedded Derivatives In Indexed Annuity [Member] | Weighted Average [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Embedded Derivative Liability, Measurement Input | 0.03 |  | 0.03 |
Measurement Input, Mortality Rate [Member] | Embedded Derivatives In Indexed Annuity [Member] | Maximum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Embedded Derivative Liability, Measurement Input | 1 |  | 1 |
Measurement Input, Mortality Rate [Member] | Embedded Derivatives In Indexed Annuity [Member] | Minimum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Embedded Derivative Liability, Measurement Input | 0 |  | 0 |
Measurement Input, EBITDA Multiple [Member] | Corporate Debt Securities [Member] | Weighted Average [Member] | Valuation, Market Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Debt Instrument, Measurement Input | 7.2 |  |  |
Measurement Input, EBITDA Multiple [Member] | Corporate Debt Securities [Member] | Maximum [Member] | Valuation, Market Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Debt Instrument, Measurement Input | 7.6 |  | 5.3 |
Measurement Input, EBITDA Multiple [Member] | Corporate Debt Securities [Member] | Minimum [Member] | Valuation, Market Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Debt Instrument, Measurement Input | 5.3 |  |  |
Measurement Input, EBITDA Multiple [Member] | Equity securities | Weighted Average [Member] | Valuation, Market Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Equity Securities, FV-NI, Measurement Input | 10.8 |  | 9.6 |
Measurement Input, EBITDA Multiple [Member] | Equity securities | Maximum [Member] | Valuation, Market Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Equity Securities, FV-NI, Measurement Input | 11.2 |  | 11.2 |
Measurement Input, EBITDA Multiple [Member] | Equity securities | Minimum [Member] | Valuation, Market Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Equity Securities, FV-NI, Measurement Input | 8.4 |  | 8.4 |
[1] | Excludes limited partnerships that are measured at estimated fair value using the NAV per share (or its equivalent) as a practical expedient. As of September 30, 2023, the fair value of such investments was $818 million.
[2] | Excludes limited partnerships that are measured at estimated fair value using the NAV per share (or its equivalent) as a practical expedient. As of December 31, 2022, the fair value of such investments was $683 million

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