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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Loss Contingencies [Line Items]    
Pledged Collateral $ 2,323 $ 2,007
Possible losses in excess of amounts accrued 25  
Potential future loss 97  
Federal Home Loan Bank | Line of Credit    
Loss Contingencies [Line Items]    
Non-putable funding agreements issued to FHLB 1,501 $ 1,249
Acquisition of mortgage loans    
Loss Contingencies [Line Items]    
Amount of purchase commitments 330  
Purchase of limited partnership and private placement investments    
Loss Contingencies [Line Items]    
Amount of purchase commitments 2,676  
Purchase of limited partnership and private placement investments | VOEs    
Loss Contingencies [Line Items]    
Amount of purchase commitments $ 393