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Market Risk Benefits - Significant Inputs and Assumptions (Details)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Sep. 30, 2024
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Market Risk Benefit [Line Items]            
Market risk benefits $ (119) $ 335 $ (230) $ (830) $ 360 $ 1,103
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   0.0085 0.0070      
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   0.003 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   0.480 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   0.252 0.255      
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   0.116 0.119      
Weighted average | Discounted cash flow | Surrender rate            
Market Risk Benefit [Line Items]            
Market risk benefits, measurement input   0.037 0.033      
Weighted average | Discounted cash flow | Market volatility            
Market Risk Benefit [Line Items]            
Market risk benefits, measurement input   0.106 0.107      
Weighted average | Discounted cash flow | Nonperformance risk            
Market Risk Benefit [Line Items]            
Market risk benefits, measurement input   0.0085 0.0070      
Weighted average | Discounted cash flow | Mortality rate            
Market Risk Benefit [Line Items]            
Market risk benefits, measurement input   0.016 0.017