v3.26.1
Fair Value of Assets and Liabilities (Quantitative Information for Level 3 Inputs) (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Mar. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Fair Value, Option, Quantitative Disclosures [Line Items]                
Assets, Fair Value Disclosure $ 113,212 [1]   $ 113,212 [1]     $ 104,933 [2]    
Valuation, Income Approach [Member] | Liability                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Financial and Nonfinancial Liabilities, Fair Value Disclosure 2   2     3    
Corporate Debt Securities [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 10,558 $ 8,912 10,558 $ 8,912 $ 10,074 10,027 $ 8,222 $ 6,854
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (3) 60 (127) 99        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 1,103 [3] 889 [3] 1,640 [3],[4] 2,403 [4]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales (345) [3] (47) [3] (475) [3],[4] (91) [4]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (241) [3] (182) [3] (423) [3],[4] (322) [4]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 0 6 2        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 0 (9) (34) (9)        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) (6) 61 (124) 101        
Corporate Debt Securities [Member] | Income Statement Location [Axis]: us-gaap:GainLossOnInvestments                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (33) (24) (63) (31)        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) (30) (24) (65) (32)        
Corporate Debt Securities [Member] | Income Statement Location [Axis]: us-gaap:InterestExpenseOperating                
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] | Income Statement Location [Axis]: us-gaap:NetInvestmentIncome                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 3 3 7 7        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 3 3 6 6        
Corporate Debt Securities [Member] | Valuation, Market Approach [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Assets, Fair Value Disclosure $ 782   $ 782     $ 636    
Corporate Debt Securities [Member] | Weighted Average [Member] | Valuation, Market Approach [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Debt Instrument, Measurement Input 0.02   0.02     0.03    
Corporate Debt Securities [Member] | Maximum [Member] | Valuation, Market Approach [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Debt Instrument, Measurement Input 0.03   0.03     0.04    
Corporate Debt Securities [Member] | Minimum [Member] | Valuation, Market Approach [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Debt Instrument, Measurement Input 0   0     0    
Asset-backed Securities [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Assets, Fair Value Disclosure $ 1,248   $ 1,248     $ 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     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   0.67     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     0    
US Government Agencies Debt Securities [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Assets, Fair Value Disclosure $ 3   $ 3     $ 4    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 3 4 3 4 3 $ 4 4 5
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 [3],[4] 0 [4]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 [3] 0 [3] 0 [3],[4] 0 [4]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0 [3] 0 [3] (1) [3],[4] (1) [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        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0 0 0        
US Government Agencies Debt Securities [Member] | Income Statement Location [Axis]: us-gaap:GainLossOnInvestments                
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] | Income Statement Location [Axis]: us-gaap:InterestExpenseOperating                
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] | Income Statement Location [Axis]: us-gaap:NetInvestmentIncome                
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] | Weighted Average [Member] | Valuation, Market Approach [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Debt Instrument, Measurement Input 1   1     0.01    
Equity securities                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 94 91 $ 94 91 91 $ 98 87 88
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 6 [3] 0 [3] 10 [3],[4] 0 [4]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 [3] 0 [3] (1) [3],[4] (1) [4]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0 [3] 0 [3] 0 [3],[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        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0 0 0        
Equity securities | Income Statement Location [Axis]: us-gaap:GainLossOnInvestments                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (3) 4 (13) 4        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) (3) 4 (13) 5        
Equity securities | Income Statement Location [Axis]: us-gaap:InterestExpenseOperating                
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 | Income Statement Location [Axis]: us-gaap:NetInvestmentIncome                
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 | Valuation, Market Approach [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Assets, Fair Value Disclosure $ 29   $ 29     $ 41    
Equity securities | Weighted Average [Member] | Valuation, Market Approach [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Debt Instrument, Measurement Input 4   4          
Equity securities | Maximum [Member] | Valuation, Market Approach [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Debt Instrument, Measurement Input           4    
Funds Withheld At Interest Embedded Derivatives [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Assets, Fair Value Disclosure $ 21   $ 21     $ 26    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value (28) [5] (63) [5],[6] (28) [5] (63) [5],[6] (25) [5] (69) [5] (66) [6] (55) [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 [3],[5] 0 [4],[5]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 [3],[5] 0 [3],[6] 0 [3],[5] 0 [4],[5]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0 [3],[5] 0 [3],[6] 0 [3],[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]        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) [5] 0 0 [6] 0 0 [6]        
Funds Withheld At Interest Embedded Derivatives [Member] | Income Statement Location [Axis]: us-gaap:GainLossOnInvestments                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings [5] (3) 3 [6] 41 (8) [6]        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) [5] (3) 3 [6] 41 (8) [6]        
Funds Withheld At Interest Embedded Derivatives [Member] | Income Statement Location [Axis]: us-gaap:InterestExpenseOperating                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings [5] 0 0 [6] 0 0 [6]        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) [5] 0 0 [6] 0 0 [6]        
Funds Withheld At Interest Embedded Derivatives [Member] | Income Statement Location [Axis]: us-gaap:NetInvestmentIncome                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings [5] 0 0 [6] 0 0 [6]        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) [5] 0 0 [6] 0 0 [6]        
Embedded Derivatives In Indexed Annuity [Member] | Valuation, Income Approach [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Financial and Nonfinancial Liabilities, Fair Value Disclosure $ 434   $ 434     $ 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     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     0.08    
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     0.01    
Short-term Investments [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 29 9 $ 29 9 20 $ 33 3 11
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0 (1) 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 9 [3] (7) [3] 23 [3] 7 [4]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 [3] 0 [3] 2 [3] 0 [4]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0 [3] (1) [3] (18) [3] (7) [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 (6) (2)        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0 0 0        
Short-term Investments [Member] | Income Statement Location [Axis]: us-gaap:GainLossOnInvestments                
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] | Income Statement Location [Axis]: us-gaap:InterestExpenseOperating                
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] | Income Statement Location [Axis]: us-gaap:NetInvestmentIncome                
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        
Total Return Swap | Derivatives                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Assets, Fair Value Disclosure 2   2     3    
Debt Security, Government, Non-US [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 129 32 129 32 115 120 30 30
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (2) 2 (7) 2        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 16 [3] 0 [3] 16 [3],[4] 0 [4]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 [3] 0 [3] 0 [3],[4] 0 [4]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0 [3] 0 [3] 0 [3],[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        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) (2) 2 (7) 2        
Debt Security, Government, Non-US [Member] | Income Statement Location [Axis]: us-gaap:GainLossOnInvestments                
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        
Debt Security, Government, Non-US [Member] | Income Statement Location [Axis]: us-gaap:InterestExpenseOperating                
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        
Debt Security, Government, Non-US [Member] | Income Statement Location [Axis]: us-gaap:NetInvestmentIncome                
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        
Structured Finance [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 3,473 2,261 3,473 2,261 3,542 3,601 1,908 1,799
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (17) 29 (59) 49        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 517 [3] 384 [3] 1,264 [3],[4] 580 [4]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales (29) [3] (10) [3] (66) [3],[4] (10) [4]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (484) [3] (51) [3] (1,175) [3],[4] (165) [4]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 13 10 13 20        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 (69) (8) (104) (14)        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) (21) 29 (65) 50        
Structured Finance [Member] | Income Statement Location [Axis]: us-gaap:GainLossOnInvestments                
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 0        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0 0 0        
Structured Finance [Member] | Income Statement Location [Axis]: us-gaap:InterestExpenseOperating                
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        
Structured Finance [Member] | Income Statement Location [Axis]: us-gaap:NetInvestmentIncome                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 (1) 2        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0 (1) 1        
Funds withheld at interest                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 61 60 61 60 63 61 57 56
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 4 (1) 6        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 [3] 1 [3] 1 [3] 1 [4]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 [3] 0 [3] 0 [3] 0 [4]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (1) [3] (2) [3] (2) [3] (2) [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        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 3 (1) 5        
Funds withheld at interest | Income Statement Location [Axis]: us-gaap:GainLossOnInvestments                
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        
Funds withheld at interest | Income Statement Location [Axis]: us-gaap:InterestExpenseOperating                
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        
Funds withheld at interest | Income Statement Location [Axis]: us-gaap:NetInvestmentIncome                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (1) 0 2 (1)        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) (4) (1) (1) (2)        
Interest Sensitive Contract Liabilities Embedded Derivatives [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0 0 0        
Interest Sensitive Contract Liabilities Embedded Derivatives [Member] | Income Statement Location [Axis]: us-gaap:GainLossOnInvestments                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings 0 0 0        
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0 0 0        
Interest Sensitive Contract Liabilities Embedded Derivatives [Member] | Income Statement Location [Axis]: us-gaap:InterestExpenseOperating                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings (79) 8 (49) 32        
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) (147) (8) (190) (5)        
Interest Sensitive Contract Liabilities Embedded Derivatives [Member] | Income Statement Location [Axis]: us-gaap:NetInvestmentIncome                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings 0 0 0 0        
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0 0 0        
Corporate Joint Venture                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 43 0 43 0 $ 16 $ 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 27 0 43 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0 0 0 0        
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        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0 0 0        
Corporate Joint Venture | Income Statement Location [Axis]: us-gaap:GainLossOnInvestments                
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 Joint Venture | Income Statement Location [Axis]: us-gaap:InterestExpenseOperating                
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 Joint Venture | Income Statement Location [Axis]: us-gaap:NetInvestmentIncome                
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        
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     0.08    
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     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     0.05    
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     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 0.05   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     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 0.20   0.20     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     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 0.19   0.19     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     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     0.04    
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     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 0.04   0.04     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 7.8   7.8     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   14.1     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     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 9.1   9.1     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   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   7.5     7.4    
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     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     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     0    
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     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     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     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     0.01    
Measurement Input, Default Rate | Derivatives | Maximum [Member] | Valuation, Income Approach [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Derivative Asset, Measurement Input 0.06   0.06     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     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     0.01    
Measurement Input, Default Rate | Liability | Maximum [Member] | Valuation, Income Approach [Member]                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Derivative Liability, Measurement Input 0.06   0.06     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     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 June 30, 2026, the fair value of such investments was $875 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
[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 six months ended June 30, 2025:
Fixed maturity securities available-for-saleReal estate joint ventures – fair value
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 investments
Fair value, beginning of period$6,854 $30 $1,799 $5 $88 $— $11 $(55)$56 $(435)
Total gains/losses (realized/unrealized)
Included in earnings, net:
Net investment income7 — 2 — — — — — (1)— 
Investment related gains (losses), net(31)— — — 4 — — (8)— — 
Interest credited— — — — — — — — — 32 
Included in other comprehensive income (loss)99 2 49 — — — — — 6 — 
Purchases (2)
2,403 — 580 — — — 7 — 1 11 
Sales (2)
(91)— (10)— (1)— — — — — 
Settlements (2)
(322)— (165)(1)— — (7)— (2)38 
Transfers into Level 32 — 20 — — — — — — — 
Transfers out of Level 3(9)— (14)— — — (2)— — — 
Fair value, end of period$8,912 $32 $2,261 $4 $91 $— $9 $(63)$60 $(354)
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 $— $1 $— $— $— $— $— $(2)$— 
Investment related gains (losses), net(32)— — — 5 — — (8)— — 
Interest credited— — — — — — — — — (5)
Included in other comprehensive income (loss)101 2 50 — — — — — 5 — 
(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.