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Market Risk Benefits - Significant Inputs and Assumptions (Details)
$ in Millions
12 Months Ended
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Market Risk Benefit [Line Items]        
Market risk benefits $ (919) $ 335 $ 1,103 $ 2,901
Utilization of guaranteed withdrawals        
Market Risk Benefit [Line Items]        
Increase (decrease) in net income from change in assumptions (15) (18)    
Surrender rate        
Market Risk Benefit [Line Items]        
Increase (decrease) in net income from change in assumptions $ (83) $ (110)    
Discounted cash flow | Nonperformance risk        
Market Risk Benefit [Line Items]        
Market risk benefits, measurement input 0.0065 0.0085    
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 0.003    
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 0.480    
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 0.252    
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 0.116    
Weighted average | Discounted cash flow | Surrender rate        
Market Risk Benefit [Line Items]        
Market risk benefits, measurement input 0.033 0.037    
Weighted average | Discounted cash flow | Market volatility        
Market Risk Benefit [Line Items]        
Market risk benefits, measurement input 0.103 0.106    
Weighted average | Discounted cash flow | Nonperformance risk        
Market Risk Benefit [Line Items]        
Market risk benefits, measurement input 0.0065 0.0085    
Weighted average | Discounted cash flow | Mortality rate        
Market Risk Benefit [Line Items]        
Market risk benefits, measurement input 0.017 0.016