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Investments - Schedule of Distribution of Residential Mortgage Loans by State (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]            
Allowance for expected loan loss $ (69) $ (64) $ (66) $ (64) $ (64) $ (42)
Total commercial mortgage loans, net of valuation allowance 5,626   5,336      
Residential Mortgage Loans            
Schedule of Investments [Line Items]            
Amortized Cost $ 3,105   $ 2,852      
% of Total 100.00%   100.00%      
Allowance for expected loan loss $ (51) $ (50) $ (54) $ (49) $ (51) $ (32)
Total commercial mortgage loans, net of valuation allowance 3,054   2,798      
Florida | Residential Mortgage Loans            
Schedule of Investments [Line Items]            
Amortized Cost $ 160   $ 163      
% of Total 5.00%   6.00%      
New York | Residential Mortgage Loans            
Schedule of Investments [Line Items]            
Amortized Cost     $ 129      
% of Total     5.00%      
Texas | Residential Mortgage Loans            
Schedule of Investments [Line Items]            
Amortized Cost     $ 129      
% of Total     5.00%      
All other states | Residential Mortgage Loans            
Schedule of Investments [Line Items]            
Amortized Cost $ 2,945   $ 2,431      
% of Total 95.00%   84.00%