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Derivative Instruments Derivative Instruments (Credit Derivatives) (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Derivative [Line Items]    
Credit Derivative, Maximum Exposure, Undiscounted $ 2,304 $ 3,053
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) 50 63
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 2,304 3,053
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) 50 63
NAIC 1    
Derivative [Line Items]    
Credit Derivative, Maximum Exposure, Undiscounted 50 50
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) 1 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 50 50
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) 1 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 2,154 3,003
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) 40 63
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 2,154 3,003
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) 40 63
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 0 0
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) 0 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 0 0
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) 0 0
NAIC 6    
Derivative [Line Items]    
Credit Derivative, Maximum Exposure, Undiscounted 100 0
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) 9 0
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 100 0
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) $ 9 $ 0