v3.26.1
Fair Value of Financial Instruments - Schedule of Significant Unobservable Inputs Used for Fair Value Measurements Classified as Level 3 (Details)
$ in Millions
Jun. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 45,264 $ 45,762  
Derivative assets 36 39  
Other assets, at fair value 287 349  
Reinsurance recoverable      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Other assets, at fair value 89 98 $ 107
Equity index options      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Derivative assets 15 18  
Forward bond purchase commitments      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Derivative assets 7 6  
U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 26,355 27,046  
Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 7,018 7,191  
Utilities | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 4,551 4,515  
Utilities | Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 585 637  
Energy | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 2,421 2,452  
Energy | Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 918 944  
Finance and insurance | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 6,871 7,057  
Finance and insurance | Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 1,689 1,719  
Consumer—non-cyclical | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 4,390 4,406  
Consumer—non-cyclical | Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 531 557  
Technology and communications | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 2,480 2,749  
Technology and communications | Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 721 689  
Industrial | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 867 954  
Industrial | Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 735 761  
Capital goods | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 2,279 2,319  
Capital goods | Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 700 692  
Consumer—cyclical | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 1,207 1,249  
Consumer—cyclical | Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 217 250  
Transportation | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 1,052 1,075  
Transportation | Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 490 485  
Other | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 237 270  
Other | Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 432 457  
Level 3      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 3,243 3,071  
Derivative assets 22 24  
Level 3 | Lapse Rate, Non-performance Risk and Equity Index Volatility | Reinsurance recoverable      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Other assets, at fair value 89    
Level 3 | Equity index options      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Derivative assets 15 18  
Level 3 | Equity index options | Equity index volatility      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Derivative assets $ 15    
Level 3 | Equity index options | Minimum | Equity index volatility      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Derivative asset, measurement input 0.13    
Level 3 | Equity index options | Maximum | Equity index volatility      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Derivative asset, measurement input 0.29    
Level 3 | Equity index options | Weighted Average | Equity index volatility      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Derivative asset, measurement input 0.19    
Level 3 | Forward bond purchase commitments      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Derivative assets $ 7 6  
Level 3 | Forward bond purchase commitments | Counterparty financing spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Derivative assets $ 7    
Level 3 | Forward bond purchase commitments | Minimum | Counterparty financing spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Derivative asset, measurement input 0.0017    
Level 3 | Forward bond purchase commitments | Maximum | Counterparty financing spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Derivative asset, measurement input 0.0043    
Level 3 | Forward bond purchase commitments | Weighted Average | Counterparty financing spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Derivative asset, measurement input 0.0024    
Level 3 | Reinsurance recoverable | Minimum | Lapse rate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Net market risk benefit, measurement input 0.02    
Level 3 | Reinsurance recoverable | Minimum | Equity index volatility      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Net market risk benefit, measurement input 0.17    
Level 3 | Reinsurance recoverable | Minimum | Non-performance risk (credit spreads)      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Net market risk benefit, measurement input 0.0042    
Level 3 | Reinsurance recoverable | Maximum | Lapse rate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Net market risk benefit, measurement input 0.09    
Level 3 | Reinsurance recoverable | Maximum | Equity index volatility      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Net market risk benefit, measurement input 0.27    
Level 3 | Reinsurance recoverable | Maximum | Non-performance risk (credit spreads)      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Net market risk benefit, measurement input 0.0083    
Level 3 | Reinsurance recoverable | Weighted Average | Lapse rate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Net market risk benefit, measurement input 0.05    
Level 3 | Reinsurance recoverable | Weighted Average | Equity index volatility      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Net market risk benefit, measurement input 0.23    
Level 3 | Reinsurance recoverable | Weighted Average | Non-performance risk (credit spreads)      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Net market risk benefit, measurement input 0.0069    
Level 3 | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 1,995 1,957  
Level 3 | U.S. corporate | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 1,865    
Level 3 | U.S. corporate | Minimum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0014    
Level 3 | U.S. corporate | Maximum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0209    
Level 3 | U.S. corporate | Weighted Average | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0121    
Level 3 | Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 749 749  
Level 3 | Non-U.S. corporate | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 707    
Level 3 | Non-U.S. corporate | Minimum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0053    
Level 3 | Non-U.S. corporate | Maximum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0186    
Level 3 | Non-U.S. corporate | Weighted Average | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0107    
Level 3 | Utilities | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 1,048 1,004  
Level 3 | Utilities | U.S. corporate | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 1,002    
Level 3 | Utilities | U.S. corporate | Minimum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0053    
Level 3 | Utilities | U.S. corporate | Maximum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0202    
Level 3 | Utilities | U.S. corporate | Weighted Average | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0118    
Level 3 | Utilities | Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 215 237  
Level 3 | Utilities | Non-U.S. corporate | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 214    
Level 3 | Utilities | Non-U.S. corporate | Minimum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0074    
Level 3 | Utilities | Non-U.S. corporate | Maximum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0186    
Level 3 | Utilities | Non-U.S. corporate | Weighted Average | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0103    
Level 3 | Energy | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 64 21  
Level 3 | Energy | U.S. corporate | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 50    
Level 3 | Energy | U.S. corporate | Minimum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0117    
Level 3 | Energy | U.S. corporate | Maximum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0209    
Level 3 | Energy | U.S. corporate | Weighted Average | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0179    
Level 3 | Energy | Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 99 107  
Level 3 | Energy | Non-U.S. corporate | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 86    
Level 3 | Energy | Non-U.S. corporate | Minimum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0081    
Level 3 | Energy | Non-U.S. corporate | Maximum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0147    
Level 3 | Energy | Non-U.S. corporate | Weighted Average | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0101    
Level 3 | Finance and insurance | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 610 619  
Level 3 | Finance and insurance | U.S. corporate | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 589    
Level 3 | Finance and insurance | U.S. corporate | Minimum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0014    
Level 3 | Finance and insurance | U.S. corporate | Maximum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0195    
Level 3 | Finance and insurance | U.S. corporate | Weighted Average | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0126    
Level 3 | Finance and insurance | Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 22 22  
Level 3 | Finance and insurance | Non-U.S. corporate | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 22    
Level 3 | Finance and insurance | Non-U.S. corporate | Minimum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0098    
Level 3 | Finance and insurance | Non-U.S. corporate | Maximum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0124    
Level 3 | Finance and insurance | Non-U.S. corporate | Weighted Average | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0108    
Level 3 | Consumer—non-cyclical | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 34 35  
Level 3 | Consumer—non-cyclical | U.S. corporate | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 34    
Level 3 | Consumer—non-cyclical | U.S. corporate | Minimum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0064    
Level 3 | Consumer—non-cyclical | U.S. corporate | Maximum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0209    
Level 3 | Consumer—non-cyclical | U.S. corporate | Weighted Average | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0110    
Level 3 | Consumer—non-cyclical | Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 17 16  
Level 3 | Consumer—non-cyclical | Non-U.S. corporate | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 14    
Level 3 | Consumer—non-cyclical | Non-U.S. corporate | Minimum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0081    
Level 3 | Consumer—non-cyclical | Non-U.S. corporate | Maximum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0133    
Level 3 | Consumer—non-cyclical | Non-U.S. corporate | Weighted Average | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0094    
Level 3 | Technology and communications | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 19 18  
Level 3 | Technology and communications | U.S. corporate | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 19    
Level 3 | Technology and communications | U.S. corporate | Minimum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0071    
Level 3 | Technology and communications | U.S. corporate | Maximum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0174    
Level 3 | Technology and communications | U.S. corporate | Weighted Average | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0118    
Level 3 | Technology and communications | Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 20 9  
Level 3 | Technology and communications | Non-U.S. corporate | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 20    
Fixed maturity securities, measurement input 0.0088    
Level 3 | Industrial | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 17 16  
Level 3 | Industrial | U.S. corporate | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 17    
Level 3 | Industrial | U.S. corporate | Minimum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0071    
Level 3 | Industrial | U.S. corporate | Maximum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0153    
Level 3 | Industrial | U.S. corporate | Weighted Average | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0098    
Level 3 | Industrial | Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 114 116  
Level 3 | Industrial | Non-U.S. corporate | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 114    
Level 3 | Industrial | Non-U.S. corporate | Minimum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0081    
Level 3 | Industrial | Non-U.S. corporate | Maximum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0169    
Level 3 | Industrial | Non-U.S. corporate | Weighted Average | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0112    
Level 3 | Capital goods | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 36 37  
Level 3 | Capital goods | U.S. corporate | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 36    
Level 3 | Capital goods | U.S. corporate | Minimum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0117    
Level 3 | Capital goods | U.S. corporate | Maximum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0134    
Level 3 | Capital goods | U.S. corporate | Weighted Average | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0123    
Level 3 | Capital goods | Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 79 64  
Level 3 | Capital goods | Non-U.S. corporate | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 72    
Level 3 | Capital goods | Non-U.S. corporate | Minimum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0110    
Level 3 | Capital goods | Non-U.S. corporate | Maximum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0169    
Level 3 | Capital goods | Non-U.S. corporate | Weighted Average | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0131    
Level 3 | Consumer—cyclical | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 41 55  
Level 3 | Consumer—cyclical | U.S. corporate | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 39    
Level 3 | Consumer—cyclical | U.S. corporate | Minimum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0098    
Level 3 | Consumer—cyclical | U.S. corporate | Maximum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0130    
Level 3 | Consumer—cyclical | U.S. corporate | Weighted Average | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0122    
Level 3 | Consumer—cyclical | Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 26 24  
Level 3 | Consumer—cyclical | Non-U.S. corporate | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 22    
Fixed maturity securities, measurement input 0.0110    
Level 3 | Transportation | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 12 27  
Level 3 | Transportation | U.S. corporate | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 12    
Level 3 | Transportation | U.S. corporate | Minimum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0047    
Level 3 | Transportation | U.S. corporate | Maximum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0141    
Level 3 | Transportation | U.S. corporate | Weighted Average | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0116    
Level 3 | Transportation | Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 88 79  
Level 3 | Transportation | Non-U.S. corporate | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 87    
Level 3 | Transportation | Non-U.S. corporate | Minimum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0081    
Level 3 | Transportation | Non-U.S. corporate | Maximum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0153    
Level 3 | Transportation | Non-U.S. corporate | Weighted Average | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0112    
Level 3 | Other | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 114 125  
Level 3 | Other | U.S. corporate | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 67    
Level 3 | Other | U.S. corporate | Minimum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0076    
Level 3 | Other | U.S. corporate | Maximum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0156    
Level 3 | Other | U.S. corporate | Weighted Average | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0098    
Level 3 | Other | Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 69 $ 75  
Level 3 | Other | Non-U.S. corporate | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 56    
Level 3 | Other | Non-U.S. corporate | Minimum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0053    
Level 3 | Other | Non-U.S. corporate | Maximum | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0117    
Level 3 | Other | Non-U.S. corporate | Weighted Average | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturity securities, measurement input 0.0099