v3.26.1
Market Risk Benefits - Significant Inputs and Assumptions (Details)
$ in Millions
12 Months Ended
Dec. 31, 2025
USD ($)
Mar. 31, 2026
USD ($)
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Market Risk Benefit [Line Items]        
Market risk benefits $ (1,092) $ (575) $ (114) $ (919)
Utilization of guaranteed withdrawals        
Market Risk Benefit [Line Items]        
Increase (decrease) in net income from change in assumptions (14)      
Surrender rate        
Market Risk Benefit [Line Items]        
Increase (decrease) in net income from change in assumptions $ (70)      
Discounted cash flow | Nonperformance risk        
Market Risk Benefit [Line Items]        
Market risk benefits, measurement input 0.0065 0.0075    
Minimum | Discounted cash flow | Utilization of guaranteed withdrawals        
Market Risk Benefit [Line Items]        
Market risk benefits, measurement input 0.000 0.000    
Minimum | Discounted cash flow | Surrender rate        
Market Risk Benefit [Line Items]        
Market risk benefits, measurement input 0.004 0.004    
Minimum | Discounted cash flow | Market volatility        
Market Risk Benefit [Line Items]        
Market risk benefits, measurement input 0.000 0.000    
Minimum | Discounted cash flow | Mortality rate        
Market Risk Benefit [Line Items]        
Market risk benefits, measurement input 0.000 0.000    
Maximum | Discounted cash flow | Utilization of guaranteed withdrawals        
Market Risk Benefit [Line Items]        
Market risk benefits, measurement input 0.528 0.528    
Maximum | Discounted cash flow | Surrender rate        
Market Risk Benefit [Line Items]        
Market risk benefits, measurement input 0.750 0.721    
Maximum | Discounted cash flow | Market volatility        
Market Risk Benefit [Line Items]        
Market risk benefits, measurement input 0.249 0.259    
Maximum | Discounted cash flow | Mortality rate        
Market Risk Benefit [Line Items]        
Market risk benefits, measurement input 0.416 0.416    
Weighted average | Discounted cash flow | Utilization of guaranteed withdrawals        
Market Risk Benefit [Line Items]        
Market risk benefits, measurement input 0.122 0.121    
Weighted average | Discounted cash flow | Surrender rate        
Market Risk Benefit [Line Items]        
Market risk benefits, measurement input 0.036 0.036    
Weighted average | Discounted cash flow | Market volatility        
Market Risk Benefit [Line Items]        
Market risk benefits, measurement input 0.112 0.120    
Weighted average | Discounted cash flow | Nonperformance risk        
Market Risk Benefit [Line Items]        
Market risk benefits, measurement input 0.0065 0.0075    
Weighted average | Discounted cash flow | Mortality rate        
Market Risk Benefit [Line Items]        
Market risk benefits, measurement input 0.018 0.017