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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Loss Contingencies [Line Items]    
Undiscounted liability of future guaranty fund assessments $ 2 $ 3
Future credits to premium taxes 22 21
Possible losses in excess of amounts accrued 25  
Amount of previously accrued interest subject to full or partial reversal if cumulative fund performance is not maintained 98  
Federal Home Loan Bank Borrowings | Line of Credit    
Loss Contingencies [Line Items]    
Non-putable funding agreements 1,700 $ 1,249
FABN Trust | Line of Credit    
Loss Contingencies [Line Items]    
Non-putable funding agreements 400  
Purchase of mortgage loans    
Loss Contingencies [Line Items]    
Amount of purchase commitments 138  
Investment purchase commitment    
Loss Contingencies [Line Items]    
Amount of purchase commitments 2,501  
Investment purchase commitment | VOEs    
Loss Contingencies [Line Items]    
Amount of purchase commitments $ 399