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Derivative Instruments (Credit Derivatives) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Derivative [Line Items]    
Credit Derivative, Maximum Exposure, Undiscounted $ 3,446 $ 6,027
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) 64 (31)
Single Name    
Derivative [Line Items]    
Credit Derivative, Maximum Exposure, Undiscounted 0 0
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) 0 0
Credit Default Index    
Derivative [Line Items]    
Credit Derivative, Maximum Exposure, Undiscounted 3,446 6,027
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) $ 64 (31)
Credit Index Product    
Derivative [Line Items]    
Credit Derivatives Written Max Length Of Maturities 24 years  
NAIC 1    
Derivative [Line Items]    
Credit Derivative, Maximum Exposure, Undiscounted $ 0 48
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) 0 0
NAIC 1 | Single Name    
Derivative [Line Items]    
Credit Derivative, Maximum Exposure, Undiscounted 0 0
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) 0 0
NAIC 1 | Credit Default Index    
Derivative [Line Items]    
Credit Derivative, Maximum Exposure, Undiscounted 0 48
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) 0 0
NAIC 2    
Derivative [Line Items]    
Credit Derivative, Maximum Exposure, Undiscounted 0 0
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) 0 0
NAIC 2 | Single Name    
Derivative [Line Items]    
Credit Derivative, Maximum Exposure, Undiscounted 0 0
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) 0 0
NAIC 2 | Credit Default Index    
Derivative [Line Items]    
Credit Derivative, Maximum Exposure, Undiscounted 0 0
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) 0 0
NAIC 3    
Derivative [Line Items]    
Credit Derivative, Maximum Exposure, Undiscounted 2,723 5,197
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) 19 (46)
NAIC 3 | Single Name    
Derivative [Line Items]    
Credit Derivative, Maximum Exposure, Undiscounted 0 0
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) 0 0
NAIC 3 | Credit Default Index    
Derivative [Line Items]    
Credit Derivative, Maximum Exposure, Undiscounted 2,723 5,197
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) 19 (46)
NAIC 4    
Derivative [Line Items]    
Credit Derivative, Maximum Exposure, Undiscounted 0 0
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) 0 0
NAIC 4 | Single Name    
Derivative [Line Items]    
Credit Derivative, Maximum Exposure, Undiscounted 0 0
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) 0 0
NAIC 4 | Credit Default Index    
Derivative [Line Items]    
Credit Derivative, Maximum Exposure, Undiscounted 0 0
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) 0 0
NAIC 5    
Derivative [Line Items]    
Credit Derivative, Maximum Exposure, Undiscounted 89 0
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) 5 0
NAIC 5 | Single Name    
Derivative [Line Items]    
Credit Derivative, Maximum Exposure, Undiscounted 0 0
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) 0 0
NAIC 5 | Credit Default Index    
Derivative [Line Items]    
Credit Derivative, Maximum Exposure, Undiscounted 89 0
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) 5 0
NAIC 6    
Derivative [Line Items]    
Credit Derivative, Maximum Exposure, Undiscounted 634 782
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) $ 40 $ 15
us-gaap_CreditDerivativeMaximumExposureUndiscounted percentage 3.00% 2.00%
NAIC 6 | Single Name    
Derivative [Line Items]    
Credit Derivative, Maximum Exposure, Undiscounted $ 0 $ 0
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) 0 0
NAIC 6 | Credit Default Index    
Derivative [Line Items]    
Credit Derivative, Maximum Exposure, Undiscounted 634 782
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) $ 40 $ 15