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Investments - Distribution of Residential Mortgage Loans by State (Details) - Residential mortgage loans - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Amortized Cost $ 2,704 $ 2,180
% of Total 100.00% 100.00%
Florida    
Schedule of Investments [Line Items]    
Amortized Cost $ 148 $ 324
% of Total 5.00% 15.00%
Texas    
Schedule of Investments [Line Items]    
Amortized Cost   $ 215
% of Total   10.00%
New Jersey    
Schedule of Investments [Line Items]    
Amortized Cost   $ 172
% of Total   8.00%
Pennsylvania    
Schedule of Investments [Line Items]    
Amortized Cost   $ 153
% of Total   7.00%
California    
Schedule of Investments [Line Items]    
Amortized Cost   $ 139
% of Total   6.00%
NEW YORK    
Schedule of Investments [Line Items]    
Amortized Cost $ 128 $ 138
% of Total 5.00% 6.00%
Georgia    
Schedule of Investments [Line Items]    
Amortized Cost   $ 125
% of Total   6.00%
All other states    
Schedule of Investments [Line Items]    
Amortized Cost $ 2,428 $ 914
% of Total 90.00% 42.00%