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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 | Mar. 31, 2025 USD ($) | Dec. 31, 2024 USD ($)
--- | --- | ---
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Assets, Fair Value Disclosure | $ 88,905 | [1] | $ 80,121 | [2]
Valuation, Income Approach [Member] | Other Liabilities |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 1 |  | 2 |
Corporate Debt Securities [Member] | Valuation, Market Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Assets, Fair Value Disclosure | $ 352 |  | $ 99 |
Corporate Debt Securities [Member] | Maximum [Member] | Valuation, Market Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Debt Instrument, Measurement Input | 0.02 |  | 0.02 |
Asset-backed Securities [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Assets, Fair Value Disclosure | $ 677 |  | $ 564 |
Asset-backed Securities [Member] | Weighted Average [Member] | Valuation, Market Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Debt Instrument, Measurement Input | 0.05 |  | 0.03 |
Asset-backed Securities [Member] | Maximum [Member] | Valuation, Market Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Debt Instrument, Measurement Input | 0.20 |  | 0.10 |
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 | $ 4 |  | $ 0 |
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 |  |  |
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 |  |  |
US Government Agencies Debt Securities [Member] | Minimum [Member] | Valuation, Market Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Debt Instrument, Measurement Input | 0 |  |  |
Equity securities | Valuation, Market Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Assets, Fair Value Disclosure | $ 31 |  | $ 33 |
Equity securities | Weighted Average [Member] | Valuation, Market Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Debt Instrument, Measurement Input | 0.04 |  | 0.04 |
Funds Withheld At Interest Embedded Derivatives [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Assets, Fair Value Disclosure | $ 24 |  | $ 22 |
Embedded Derivatives In Indexed Annuity [Member] | Valuation, Income Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | $ 383 |  | $ 435 |
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 |
Total Return Swap | Other Assets |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Assets, Fair Value Disclosure | $ 1 |  | $ 2 |
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 | 0.05 |  | 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 | 0.10 |  | 0.10 |
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 |  | 0.04 |
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 | 0.10 |  | 0.10 |
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 | 0.18 |  | 0.18 |
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 | 0.17 |  | 0.17 |
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 | 0.04 |  | 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 | 9.3 |  | 11.0 |
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 | 11.0 |  | 9.7 |
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 | 6.2 |  | 6.7 |
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 | 10.5 |  | 10.9 |
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 | 11.8 |  | 12.8 |
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 | 7.4 |  | 7.4 |
Measurement Input, Credit Spread | Other Liabilities | Weighted Average [Member] | Valuation, Income Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Derivative Liability, Measurement Input | 0 |  | 0 |
Measurement Input, Credit Spread | Other Liabilities | Maximum [Member] | Valuation, Income Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Derivative Liability, Measurement Input | 0.01 |  | 0.01 |
Measurement Input, Credit Spread | Other Liabilities | Minimum [Member] | Valuation, Income Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Derivative Liability, Measurement Input | 0 |  | 0 |
Measurement Input, Credit Spread | Other Assets | Weighted Average [Member] | Valuation, Income Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Derivative Asset, Measurement Input | 0 |  | 0 |
Measurement Input, Credit Spread | Other Assets | Maximum [Member] | Valuation, Income Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Derivative Asset, Measurement Input | 0.01 |  | 0.01 |
Measurement Input, Credit Spread | Other Assets | Minimum [Member] | Valuation, Income Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Derivative Asset, Measurement Input | 0 |  | 0 |
Measurement Input, Default Rate | Other Liabilities | Weighted Average [Member] | Valuation, Income Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Derivative Liability, Measurement Input | 0 |  | 0 |
Measurement Input, Default Rate | Other Liabilities | Maximum [Member] | Valuation, Income Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Derivative Liability, Measurement Input | 0.07 |  | 0.08 |
Measurement Input, Default Rate | Other Liabilities | Minimum [Member] | Valuation, Income Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Derivative Liability, Measurement Input | 0 |  | 0 |
Measurement Input, Default Rate | Other Assets | Weighted Average [Member] | Valuation, Income Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Derivative Asset, Measurement Input | 0 |  | 0 |
Measurement Input, Default Rate | Other Assets | Maximum [Member] | Valuation, Income Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Derivative Asset, Measurement Input | 0.07 |  | 0.08 |
Measurement Input, Default Rate | Other Assets | Minimum [Member] | Valuation, Income Approach [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Derivative Asset, Measurement Input | 0 |  | 0 |
[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 March 31, 2025, the fair value of such investments was $963 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, 2024, the fair value of such investments was $966 million

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