v3.26.1
Commitments and Contingent Liabilities (Narrative Excluding Litigation) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2026
USD ($)
Mar. 31, 2025
USD ($)
Dec. 31, 2025
USD ($)
Nov. 30, 2025
USD ($)
Related Party        
Commitments and Contingent Liabilities [Line Items]        
Prismic Re Unfunded Commitment       $ 320
Commitments | Commercial Mortgage Loans        
Commitments and Contingent Liabilities [Line Items]        
Allowance for credit losses $ 5   $ 5  
Change in allowance for credit losses 0 $ 0    
Purchase Investments        
Commitments and Contingent Liabilities [Line Items]        
Change in allowance for credit losses $ 0 0    
Indemnification | Securities Lending and Securities Repurchase Transactions        
Commitments and Contingent Liabilities [Line Items]        
Guarantor obligations, liquidation proceeds, percentage 102.00%      
Indemnification | Securities Repurchase Transactions        
Commitments and Contingent Liabilities [Line Items]        
Guarantor obligations, liquidation proceeds, percentage 95.00%      
Indemnification | Serviced Mortgage Loans        
Commitments and Contingent Liabilities [Line Items]        
Allowance for credit losses $ 10   11  
Change in allowance for credit losses 1 0    
Mortgages subject to loss-sharing arrangements $ 29,126   $ 28,275  
Weighted-average debt service coverage ratio of mortgages subject to loss-sharing arrangements 1.95   1.93  
Weighted-average loan-to-value ratio of mortgages subject to loss-sharing arrangements 63.00%   62.00%  
Losses related to indemnifications that were settled $ 0 $ 0    
Indemnification | Minimum | Serviced Mortgage Loans        
Commitments and Contingent Liabilities [Line Items]        
Percentage share of losses incurred on certain loans serviced 4.00%      
Indemnification | Maximum | Serviced Mortgage Loans        
Commitments and Contingent Liabilities [Line Items]        
Percentage share of losses incurred on certain loans serviced 20.00%