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Investments - Schedule of Distribution of Residential Mortgage Loans by State (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]            
Allowance for expected credit loss $ (77) $ (75) $ (70) $ (69) $ (64) $ (66)
Total CMLs, net of valuation allowance 7,391   5,926      
Residential Mortgage            
Schedule of Investments [Line Items]            
Amortized Cost $ 4,165   $ 3,274      
% of Total 100.00%   100.00%      
Allowance for expected credit loss $ (58) $ (58) $ (53) $ (51) $ (50) $ (54)
Total CMLs, net of valuation allowance 4,107   3,221      
Florida | Residential Mortgage            
Schedule of Investments [Line Items]            
Amortized Cost $ 199   $ 164      
% of Total 5.00%   5.00%      
New York | Residential Mortgage            
Schedule of Investments [Line Items]            
Amortized Cost $ 186          
% of Total 5.00%          
California | Residential Mortgage            
Schedule of Investments [Line Items]            
Amortized Cost $ 177          
% of Total 5.00%          
All other states | Residential Mortgage            
Schedule of Investments [Line Items]            
Amortized Cost $ 3,596   $ 3,110      
% of Total 85.00%   95.00%