v3.26.1
Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Quantitative Information for Level 3 Inputs) (Details)
$ in Millions
Mar. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
Fair Value, Option, Quantitative Disclosures [Line Items]    
Assets, Fair Value Disclosure $ 111,063 [1] $ 104,933 [2]
Valuation, Income Approach [Member] | Liability    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Financial and Nonfinancial Liabilities, Fair Value Disclosure 2 3
Corporate Debt Securities [Member] | Valuation, Market Approach [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Assets, Fair Value Disclosure $ 585 $ 636
Corporate Debt Securities [Member] | Weighted Average [Member] | Valuation, Market Approach [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Debt Instrument, Measurement Input 0.03 0.03
Corporate Debt Securities [Member] | Maximum [Member] | Valuation, Market Approach [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Debt Instrument, Measurement Input 0.04 0.04
Corporate Debt Securities [Member] | Minimum [Member] | Valuation, Market Approach [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Debt Instrument, Measurement Input 0.02 0
Asset-backed Securities [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Assets, Fair Value Disclosure $ 1,153 $ 1,329
Asset-backed Securities [Member] | Weighted Average [Member] | Valuation, Market Approach [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Debt Instrument, Measurement Input 0.04 0.04
Asset-backed Securities [Member] | Maximum [Member] | Valuation, Market Approach [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Debt Instrument, Measurement Input 0.67 0.20
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 $ 3 $ 4
Equity securities | Valuation, Market Approach [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Assets, Fair Value Disclosure $ 30 $ 41
Equity securities | Weighted Average [Member] | Valuation, Market Approach [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Debt Instrument, Measurement Input 4 0.04
Funds Withheld At Interest Embedded Derivatives [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Assets, Fair Value Disclosure $ 44 $ 26
Embedded Derivatives In Indexed Annuity [Member] | Valuation, Income Approach [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Financial and Nonfinancial Liabilities, Fair Value Disclosure $ 397 $ 470
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 0.08 0.08
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 | Derivatives    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Assets, Fair Value Disclosure $ 2 $ 3
US Government Debt Securities | Weighted Average [Member] | Valuation, Market Approach [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Debt Instrument, Measurement Input 1 1
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 0.08 0.08
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 0.05
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 0.05 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 0.16 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 0.04 0.04
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 8.0 9.3
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 14.1 14.8
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 6.0 6.0
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 9.0 9.9
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 11.6 13.3
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 7.5 7.4
Measurement Input, Credit Spread | Liability | Weighted Average [Member] | Valuation, Income Approach [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative Liability, Measurement Input 0 0
Measurement Input, Credit Spread | Liability | 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 | Liability | Minimum [Member] | Valuation, Income Approach [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative Liability, Measurement Input 0 0
Measurement Input, Credit Spread | Derivatives | Weighted Average [Member] | Valuation, Income Approach [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative Asset, Measurement Input 0 0
Measurement Input, Credit Spread | Derivatives | 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 | Derivatives | Minimum [Member] | Valuation, Income Approach [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative Asset, Measurement Input 0 0
Measurement Input, Default Rate | Liability | Weighted Average [Member] | Valuation, Income Approach [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative Liability, Measurement Input 0.01 0.01
Measurement Input, Default Rate | Liability | Maximum [Member] | Valuation, Income Approach [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative Liability, Measurement Input 0.07 0.07
Measurement Input, Default Rate | Liability | Minimum [Member] | Valuation, Income Approach [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative Liability, Measurement Input 0 0
Measurement Input, Default Rate | Derivatives | Weighted Average [Member] | Valuation, Income Approach [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative Asset, Measurement Input 0.01 0.01
Measurement Input, Default Rate | Derivatives | Maximum [Member] | Valuation, Income Approach [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative Asset, Measurement Input 0.07 0.07
Measurement Input, Default Rate | Derivatives | 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, 2026, the fair value of such investments was $935 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, 2025, the fair value of such investments was $925 million