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Investments - Credit Quality of RMLs (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Jun. 01, 2020
Financing Receivable, Credit Quality Indicator [Line Items]      
Allowance for expected loan loss $ (31) $ (39) $ 0
Loans, net 3,749 $ 2,031  
% of Total   100.00%  
Residential Mortgage      
Financing Receivable, Credit Quality Indicator [Line Items]      
Carrying Value 1,606 $ 1,165  
Allowance for expected loan loss (25) (37) $ 0
Loans, net $ 1,581 $ 1,128  
% of Total 100.00% 100.00%  
Allowance % of Total 0.00% 0.00%  
Residential Mortgage | Performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
Carrying Value $ 1,533 $ 1,059  
% of Total 95.00% 91.00%  
Residential Mortgage | Over 90 days past due | Non-performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
Carrying Value $ 73 $ 106  
% of Total 5.00% 9.00%