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Market Risk Benefits - Significant Inputs and Assumptions (Details)
$ in Millions
12 Months Ended
Dec. 31, 2024
USD ($)
Jun. 30, 2025
USD ($)
Mar. 31, 2025
USD ($)
Jun. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Market Risk Benefit [Line Items]            
Market risk benefits $ (919) $ (769) $ (114) $ (830) $ (629) $ 335
Utilization of guaranteed withdrawals            
Market Risk Benefit [Line Items]            
Increase (decrease) in net income from change in assumptions (15)          
Surrender rate            
Market Risk Benefit [Line Items]            
Increase (decrease) in net income from change in assumptions $ (83)          
Discounted cash flow | Nonperformance risk            
Market Risk Benefit [Line Items]            
Market risk benefits, measurement input 0.0065 0.0065        
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 0.750        
Maximum | Discounted cash flow | Market volatility            
Market Risk Benefit [Line Items]            
Market risk benefits, measurement input 0.246 0.257        
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 0.119 0.119        
Weighted average | Discounted cash flow | Surrender rate            
Market Risk Benefit [Line Items]            
Market risk benefits, measurement input 0.033 0.033        
Weighted average | Discounted cash flow | Market volatility            
Market Risk Benefit [Line Items]            
Market risk benefits, measurement input 0.103 0.108        
Weighted average | Discounted cash flow | Nonperformance risk            
Market Risk Benefit [Line Items]            
Market risk benefits, measurement input 0.0065 0.0065        
Weighted average | Discounted cash flow | Mortality rate            
Market Risk Benefit [Line Items]            
Market risk benefits, measurement input 0.017 0.017