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Derivatives - Credit Risk Assumed through Credit Derivatives (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Credit Derivatives [Line Items]    
Derivative, Notional Amount $ 10,755 $ 11,224
Fair Value 47 (42)
Asset Pledged as Collateral    
Credit Derivatives [Line Items]    
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Security Not Offset 8 48
Asset Pledged as Collateral | Over the Counter [Member]    
Credit Derivatives [Line Items]    
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Security Not Offset 57 82
Credit derivatives    
Credit Derivatives [Line Items]    
Derivative, Notional Amount 103 105
Fair Value (3) (2)
Offsetting Notional Amount 103 105
Offsetting Fair Value 3 2
Credit derivatives | Basket credit default swaps | Standard & Poor's, AAA Rating [Member] | Investment grade risk exposure    
Credit Derivatives [Line Items]    
Derivative, Notional Amount 100 101
Fair Value $ (1) $ 0
Weighted Average Years to Maturity 6 years 6 years
Offsetting Notional Amount $ 100 $ 101
Offsetting Fair Value 1 0
Credit derivatives | Basket credit default swaps | CCC | Below investment grade risk exposure    
Credit Derivatives [Line Items]    
Derivative, Notional Amount   4
Fair Value   $ (2)
Average Term of Credit Risk Derivatives Less than 1 Year   Less than 1 year
Offsetting Notional Amount   $ 4
Offsetting Fair Value   $ 2
Credit derivatives | Basket credit default swaps | Standard & Poor's, B- Rating | Below investment grade risk exposure    
Credit Derivatives [Line Items]    
Derivative, Notional Amount 3  
Fair Value $ (2)  
Average Term of Credit Risk Derivatives Less than 1 Year Less than 1 year  
Offsetting Notional Amount $ 3  
Offsetting Fair Value $ 2