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Fair Value of Assets and Liabilities (Quantitative Information for Level 3 Inputs) (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Fair Value, Option, Quantitative Disclosures [Line Items]                
Assets, Fair Value Disclosure $ 102,786 [1]   $ 102,786 [1]     $ 80,121 [2]    
Valuation, Income Approach [Member] | Other Liabilities                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Financial and Nonfinancial Liabilities, Fair Value Disclosure 3   3     2    
Corporate Debt Securities [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 9,737 $ 6,143 9,737 $ 6,143 $ 8,912 6,854 $ 5,501 $ 4,933
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 3 149 102 132        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 1,156 [3] 809 [3] 3,559 [4] 2,001 [4]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales (87) [3] (96) [3] (178) [4] (278) [4]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (253) [3] (196) [3] (575) [4] (546) [4]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 20 0 22 1        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 0 (20) (9) (54)        
Corporate Debt Securities [Member] | Investment Income [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 3 4 10 10        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 2 3 8 6        
Corporate Debt Securities [Member] | Investment Related Gains Losses [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (17) (8) (48) (56)        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) (17) (11) (49) (56)        
Corporate Debt Securities [Member] | Interest Income [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0 0 0        
Corporate Debt Securities [Member] | Other Comprehensive Income (Loss) [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 7 150 108 135        
Corporate Debt Securities [Member] | Valuation, Market Approach [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Assets, Fair Value Disclosure $ 649   $ 649     $ 99    
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     2    
Corporate Debt Securities [Member] | Minimum [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 $ 1,026   $ 1,026     $ 564    
Asset-backed Securities [Member] | Weighted Average [Member] | Valuation, Market Approach [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Debt Instrument, Measurement Input 0.03   0.03     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   0.20     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     0    
US Government Agencies Debt Securities [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Assets, Fair Value Disclosure $ 4   $ 4     $ 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 4 6 4 6 4 $ 5 27 26
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 [3] 0 [3] 0 [4] 0 [4]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 [3] 0 [3] 0 [4] 0 [4]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0 [3] 0 [3] (1) [4] (1) [4]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 0 0 2        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 0 (21) 0 (21)        
US Government Agencies Debt Securities [Member] | Investment Income [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0 0 0        
US Government Agencies Debt Securities [Member] | Investment Related Gains Losses [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0 0 0        
US Government Agencies Debt Securities [Member] | Interest Income [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0 0 0        
US Government Agencies Debt Securities [Member] | Other Comprehensive Income (Loss) [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) $ 0 0 $ 0 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 1   1     0    
Equity securities                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 94 82 $ 94 82 91 $ 88 74 70
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 2 [3] 6 [3] 2 [4] 17 [4]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 [3] (1) [3] (1) [4] (1) [4]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0 [3] 0 [3] 0 [4] 0 [4]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 0 0 0 0        
Equity securities | Investment Income [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0 0 0        
Equity securities | Investment Related Gains Losses [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 1 3 5 (4)        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 1 2 6 (5)        
Equity securities | Interest Income [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0 0 0        
Equity securities | Other Comprehensive Income (Loss) [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0 0 0        
Equity securities | Valuation, Market Approach [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Assets, Fair Value Disclosure $ 36   $ 36     $ 33    
Equity securities | Maximum [Member] | Valuation, Market Approach [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Debt Instrument, Measurement Input 0.04   0.04     4    
Funds Withheld At Interest Embedded Derivatives [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Assets, Fair Value Disclosure $ 9   $ 9     $ 22    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value (96) [5] (180) [5],[6] (96) [5] (180) [5],[6] (63) [5] (55) [5] (68) [6] (171) [5]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 [5] 0 [6] 0 [5] 0 [5]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 [3],[5] 0 [3],[6] 0 [4],[5] 0 [4],[5]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 [3],[5] 0 [3],[6] 0 [4],[5] 0 [4],[5]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0 [3],[5] 0 [3],[6] 0 [4],[5] 0 [4],[5]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 [5] 0 [6] 0 [5] 0 [5]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 0 [5] 0 [6] 0 [5] 0 [5]        
Funds Withheld At Interest Embedded Derivatives [Member] | Investment Income [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 [5] 0 [6] 0 [5] 0 [5]        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 [5] 0 [6] 0 [4] 0 [5]        
Funds Withheld At Interest Embedded Derivatives [Member] | Investment Related Gains Losses [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (33) [5] (112) [6] (41) [5] (9) [5]        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) (33) [5] (112) [6] (41) [4] (9) [5]        
Funds Withheld At Interest Embedded Derivatives [Member] | Interest Income [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 [5] 0 [6] 0 [5] 0 [5]        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 [5] 0 [6] 0 [4] 0 [5]        
Funds Withheld At Interest Embedded Derivatives [Member] | Other Comprehensive Income (Loss) [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 [5] 0 [6] 0 [4] 0 [5]        
Embedded Derivatives In Indexed Annuity [Member] | Valuation, Income Approach [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Financial and Nonfinancial Liabilities, Fair Value Disclosure $ 438   $ 438     $ 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     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     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     0.01    
Short-term Investments [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 25 11 $ 25 11 9 $ 11 15 2
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 17 [3] 3 [3] 24 [4] 12 [4]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 [3] 0 [3] 0 [4] (1) [4]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0 [3] 0 [3] (7) [4] 0 [4]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 (1) 0 (3) (1)        
Short-term Investments [Member] | Investment Income [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0 0 0        
Short-term Investments [Member] | Investment Related Gains Losses [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 (1) 0 (1)        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 (1) 0 (1)        
Short-term Investments [Member] | Interest Income [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0 0 0        
Short-term Investments [Member] | Other Comprehensive Income (Loss) [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0 0 0        
Total Return Swap | Other Assets                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Assets, Fair Value Disclosure 4   4     2    
Derivatives                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 1 0 1 0 $ 0 $ 0 $ 0 $ 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 [3] 0 [3] 0 [4] 0 [4]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 [3] 0 [3] 0 [4] 0 [4]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0 [3] 0 [3] 0 [4] 0 [4]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 0 0 0 0        
Derivatives | Investment Income [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0 0 0        
Derivatives | Investment Related Gains Losses [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 1 0 1 0        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) (1) 0 (1) 0        
Derivatives | Interest Income [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0 0 0        
Derivatives | Other Comprehensive Income (Loss) [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) $ 0 $ 0 $ 0 $ 0        
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     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     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     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     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     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     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     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     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     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     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     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     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 0.19   0.19     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     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     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 0.18   0.18     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     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     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     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     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     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     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     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     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 10.5   10.5     9.7    
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 14.8   14.8     11.0    
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 6.1   6.1     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 9.9   9.9     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 13.3   13.3     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     7.4    
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     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     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     0    
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     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     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     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 0.01   0.01     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   0.07     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     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 0.01   0.01     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   0.07     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     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 September 30, 2025, the fair value of such investments was $940 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
[3] The amount reported within purchases, sales and settlements is the purchase price (for purchases) and the sales/settlement proceeds (for sales and settlements) based upon the actual date purchased or sold/settled. Items purchased and sold/settled in the same period are excluded from the rollforward. The Company had no issuances during the period.
For the nine months ended September 30, 2024:
Fixed maturity securities available-for-sale
Funds 
withheld at interest –embedded derivatives, net (1)
Funds 
withheld at interest		Interest-sensitive contract 
liabilities – embedded derivatives
 CorporateForeign govtStructured securitiesU.S. and local govtEquity securitiesShort-term investmentsDerivatives, net
Fair value, beginning of period$4,933 $35 $1,425 $26 $70 $2 $— $(171)$54 $(415)
Total gains/losses (realized/unrealized)
Included in earnings, net:
Net investment income10 — 3 — — — — — 5 — 
Investment related gains (losses), net(56)— (1)— (4)(1)— (9)— — 
Interest credited— — — — — — — — — (27)
Included in other comprehensive income (loss)132 (1)30 — — — — — 2 — 
Purchases (2)
2,001 — 287 — 17 12 — — 2 (18)
Sales (2)
(278)— (23)— (1)(1)— — — — 
Settlements (2)
(546)— (260)(1)— — — — (3)75 
Transfers into Level 31 — 117 2 — — — — — — 
Transfers out of Level 3(54)— (22)(21)— (1)— — — — 
Fair value, end of period$6,143 $34 $1,556 $6 $82 $11 $— $(180)$60 $(385)
Total gains/losses (realized/unrealized) recorded for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
Included in earnings, net:
Net investment income$6 $— $2 $— $— $— $— $— $5 $— 
Investment related gains (losses), net(56)— (3)— (5)(1)— (9)— — 
Interest credited— — — — — — — — — (103)
Included in other comprehensive income (loss)135 (1)32 — — — — — 2 — 
(1)Funds withheld at interest – embedded derivative assets and liabilities are presented net for purposes of the rollforward.
(2)The amount reported within purchases, sales and settlements is the purchase price (for purchases) and the sales/settlement proceeds (for sales and settlements) based upon the actual date purchased or sold/settled. Items purchased and sold/settled in the same period are excluded from the rollforward. The Company had no issuances during the period.
[4] The amount reported within purchases, sales and settlements is the purchase price (for purchases) and the sales/settlement proceeds (for sales and settlements) based upon the actual date purchased or sold/settled. Items purchased and sold/settled in the same period are excluded from the rollforward. The Company had no issuances during the period.
[5] Funds withheld at interest – embedded derivative assets and liabilities are presented net for purposes of the rollforward.
[6] Funds withheld at interest – embedded derivative assets and liabilities are presented net for purposes of the rollforward.