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Investments - Credit Quality of RMLs (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]        
Allowance for expected loan loss $ (32) $ (31) $ (36) $ (39)
Total mortgage loans 4,217 3,749    
Residential mortgage loans        
Financing Receivable, Credit Quality Indicator [Line Items]        
Gross Carrying Value $ 2,012 $ 1,606    
% of Total 100.00% 100.00%    
Allowance for expected loan loss $ (26) $ (25) $ (31) $ (37)
Allowance for expected loan loss, percent 0.00% 0.00%    
Total mortgage loans $ 1,986 $ 1,581    
Allowance % of Total 100.00% 100.00%    
Residential mortgage loans | Performing        
Financing Receivable, Credit Quality Indicator [Line Items]        
Gross Carrying Value $ 1,947 $ 1,533    
% of Total 97.00% 95.00%    
Residential mortgage loans | Non-performing        
Financing Receivable, Credit Quality Indicator [Line Items]        
Gross Carrying Value $ 65 $ 73    
% of Total 3.00% 5.00%