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Investments - Schedule of Residential Mortgage Loans with Credit Quality Indicators, Performing or Nonperforming (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]            
Allowance for expected loan loss $ (75) $ (73) $ (70) $ (64) $ (67) $ (66)
Total CMLs, net of valuation allowance 6,940   5,926      
Residential Mortgage            
Schedule of Investments [Line Items]            
Amortized Cost $ 3,930   $ 3,274      
% of Total 100.00%   100.00%      
Allowance for expected loan loss $ (58) $ (56) $ (53) $ (50) $ (54) $ (54)
Total CMLs, net of valuation allowance 3,872   3,221      
Performing | Residential Mortgage            
Schedule of Investments [Line Items]            
Amortized Cost $ 3,863   $ 3,188      
% of Total 98.00%   97.00%      
Non-performing | Residential Mortgage            
Schedule of Investments [Line Items]            
Amortized Cost $ 67   $ 86      
% of Total 2.00%   3.00%