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Investments - Schedule of Loans with Credit Quality Indicators, Performing or Nonperforming (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Jun. 01, 2020
May 31, 2020
Dec. 31, 2019
Schedule of Investments [Line Items]            
Allowance for expected credit loss $ (42) $ (31) $ (39) $ 0 $ (15) $ (8)
Residential mortgages            
Schedule of Investments [Line Items]            
Amortized Cost $ 2,180 $ 1,606        
% of Total 100.00% 100.00%        
Allowance for expected credit loss $ (32) $ (25) $ (37) $ 0 $ (14) $ (7)
Financing receivable allowance for expected credit loss, percent 0.00% 0.00%        
Financing receivable, excluding accrued interest, after allowance for credit loss $ 2,148 $ 1,581        
Financing receivable, allowance for credit loss to outstanding, percent 100.00% 100.00%        
Performing Financial Instruments | Residential mortgages            
Schedule of Investments [Line Items]            
Amortized Cost $ 2,118 $ 1,533        
% of Total 97.00% 95.00%        
Nonperforming Financial Instruments | Residential mortgages            
Schedule of Investments [Line Items]            
Amortized Cost $ 62 $ 73        
% of Total 3.00% 5.00%