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Investments - Schedule of Residential Mortgage Loans with Credit Quality Indicators, Performing or Nonperforming (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]        
Allowance for credit loss $ (67) $ (66) $ (60) $ (42)
Total mortgage loans 5,440 5,336    
Residential mortgage loans        
Schedule of Investments [Line Items]        
Amortized Cost $ 2,944 $ 2,852    
% of Total 100.00% 100.00%    
Allowance for credit loss $ (54) $ (54) $ (48) $ (32)
Allowance for expected credit loss, % of Total 0.00% 0.00%    
Total mortgage loans $ 2,890 $ 2,798    
Total residential mortgage loans, net of valuation allowance, % of Total 100.00% 100.00%    
Performing Financial Instruments | Residential mortgage loans        
Schedule of Investments [Line Items]        
Amortized Cost $ 2,878 $ 2,795    
% of Total 98.00% 98.00%    
Nonperforming Financial Instruments | Residential mortgage loans        
Schedule of Investments [Line Items]        
Amortized Cost $ 66 $ 57    
% of Total 2.00% 2.00%