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
Mar. 31, 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 $ 45,095 $ 45,762  
Derivative assets 32 39  
Other assets, at fair value 368 349  
Reinsurance recoverable      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Other assets, at fair value 101 98 $ 107
Equity index options      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Derivative assets 12 18  
Forward bond purchase commitments      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Derivative assets 4 6  
U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 26,509 27,046  
Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 7,045 7,191  
Utilities | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 4,483 4,515  
Utilities | Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 599 637  
Energy | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 2,425 2,452  
Energy | Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 915 944  
Finance and insurance | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 6,922 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 1,700 1,719  
Consumer—non-cyclical | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 4,354 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 550 557  
Technology and communications | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 2,620 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 706 689  
Industrial | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 895 954  
Industrial | Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 741 761  
Capital goods | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 2,273 2,319  
Capital goods | Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 686 692  
Consumer—cyclical | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 1,219 1,249  
Consumer—cyclical | Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 221 250  
Transportation | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 1,057 1,075  
Transportation | Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 491 485  
Other | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 261 270  
Other | Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 436 457  
Level 3      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value 3,023 3,071  
Derivative assets 16 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 101    
Level 3 | Equity index options      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Derivative assets 12 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 $ 12    
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 0.45    
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 0.32    
Level 3 | Forward bond purchase commitments      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Derivative assets $ 4 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 $ 4    
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 0.0011    
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 0.0044    
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 0.0023    
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 0.19    
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 0.28    
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 0.24    
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 $ 1,888 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 $ 1,777    
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 0.0246    
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 0.0135    
Level 3 | Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 737 749  
Level 3 | Non-U.S. corporate | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 699    
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 0.0063    
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 0.0244    
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 0.0121    
Level 3 | Utilities | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 993 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 $ 949    
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 0.0063    
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 0.0229    
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 0.0128    
Level 3 | Utilities | Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 227 237  
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 $ 226    
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 0.0086    
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 0.0244    
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 0.0119    
Level 3 | Energy | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 21 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 $ 21    
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 0.0126    
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 0.0170    
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 0.0150    
Level 3 | Energy | Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 108 107  
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 $ 97    
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 0.0091    
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 0.0170    
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 0.0118    
Level 3 | Finance and insurance | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 604 619  
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 $ 586    
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 0.0246    
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 0.0151    
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 0.0115    
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 0.0139    
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 0.0124    
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 0.0077    
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 0.0220    
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 0.0125    
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 0.0098    
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 0.0148    
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 0.0107    
Level 3 | Technology and communications | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 10 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 $ 10    
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 0.0088    
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 0.0181    
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 0.0136    
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 $ 9 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 $ 9    
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 0.0088    
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 0.0170    
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 0.0117    
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 0.0102    
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 0.0180    
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 0.0123    
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 0.0126    
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 0.0141    
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 0.0132    
Level 3 | Capital goods | Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 63 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 $ 57    
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 0.0126    
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 0.0196    
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 0.0148    
Level 3 | Consumer—cyclical | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 42 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 $ 40    
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 0.0110    
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 0.0136    
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 0.0130    
Level 3 | Consumer—cyclical | Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 25 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 0.0132    
Level 3 | Transportation | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 13 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 $ 13    
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 0.0052    
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 0.0159    
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 0.0130    
Level 3 | Transportation | Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 78 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 $ 77    
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 0.0102    
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 0.0170    
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 0.0129    
Level 3 | Other | U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 118 125  
Level 3 | Other | U.S. corporate | Credit spreads      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 71    
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 0.0088    
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 0.0147    
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 0.0105    
Level 3 | Other | Non-U.S. corporate      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value $ 74 $ 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 $ 61    
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 0.0063    
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 0.0126    
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 0.0105