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Investments - Schedule of Residential Mortgage Loans with Credit Quality Indicators, Performing or Nonperforming (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]            
Allowance for expected loan loss $ (64) $ (67) $ (66) $ (64) $ (60) $ (42)
Total mortgage loans 5,439   5,336      
Residential Mortgage Loans            
Schedule of Investments [Line Items]            
Amortized Cost $ 2,929   $ 2,852      
% of Total 100.00%   100.00%      
Allowance for expected loan loss $ (50) $ (54) $ (54) $ (51) $ (48) $ (32)
Total mortgage loans 2,879   2,798      
Performing Financial Instruments | Residential Mortgage Loans            
Schedule of Investments [Line Items]            
Amortized Cost $ 2,867   $ 2,795      
% of Total 98.00%   98.00%      
Nonperforming Financial Instruments | Residential Mortgage Loans            
Schedule of Investments [Line Items]            
Amortized Cost $ 62   $ 57      
% of Total 2.00%   2.00%