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Derivatives - Credit Risk Assumed through Credit Derivatives (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Credit Derivatives [Line Items]    
Derivative, Notional Amount $ 7,416 $ 7,081
Fair Value (8) 45
Credit derivatives    
Credit Derivatives [Line Items]    
Derivative, Notional Amount 493 493
Fair Value 27 29
Derivative, Nominal Value, Amount Offset Against Collateral, Net 493 493
Offsetting Fair Value (27) (29)
Standard & Poor's, AAA Rating [Member] | Basket credit default swaps | Credit derivatives | Investment grade risk exposure    
Credit Derivatives [Line Items]    
Derivative, Notional Amount 100 100
Fair Value $ 1 $ 0
Weighted Average Years to Maturity 3 years 4 years
Derivative, Nominal Value, Amount Offset Against Collateral, Net $ 100 $ 100
Offsetting Fair Value (1) 0
Standard & Poor's, B+ Rating | Basket credit default swaps | Credit derivatives | Below investment grade risk exposure    
Credit Derivatives [Line Items]    
Derivative, Notional Amount 392 392
Fair Value $ 27 $ 30
Weighted Average Years to Maturity 3 years 3 years
Derivative, Nominal Value, Amount Offset Against Collateral, Net $ 392 $ 392
Offsetting Fair Value (27) (30)
Standard & Poor's, CCC Rating | Basket credit default swaps | Credit derivatives | Below investment grade risk exposure    
Credit Derivatives [Line Items]    
Derivative, Notional Amount 1 1
Fair Value $ (1) $ (1)
Average Term of Credit Risk Derivatives Less than 1 Year Less than 1 year Less than 1 year
Derivative, Nominal Value, Amount Offset Against Collateral, Net $ 1 $ 1
Offsetting Fair Value $ 1 $ 1