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Market Risk Benefits - Significant Inputs and Assumptions (Details)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Jun. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Market Risk Benefit [Line Items]              
Market risk benefits $ (119) $ 1,103 $ 360 $ 1,492 $ 1,937 $ 2,901 $ 4,829
Utilization of guaranteed withdrawals              
Market Risk Benefit [Line Items]              
Increase (decrease) in net income from change in assumptions (18) (39)          
Surrender rate              
Market Risk Benefit [Line Items]              
Increase (decrease) in net income from change in assumptions $ (110) (200)          
Mortality rate              
Market Risk Benefit [Line Items]              
Increase (decrease) in net income from change in assumptions   $ (49)          
Discounted cash flow | Nonperformance risk              
Market Risk Benefit [Line Items]              
Market risk benefits, measurement input 0.0105 0.0095          
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 0.002          
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 0.480          
Maximum | Discounted cash flow | Surrender rate              
Market Risk Benefit [Line Items]              
Market risk benefits, measurement input 0.750 0.456          
Maximum | Discounted cash flow | Market volatility              
Market Risk Benefit [Line Items]              
Market risk benefits, measurement input 0.252 0.266          
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 0.115 0.110          
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 0.108 0.121          
Weighted average | Discounted cash flow | Nonperformance risk              
Market Risk Benefit [Line Items]              
Market risk benefits, measurement input 0.0105 0.0095          
Weighted average | Discounted cash flow | Mortality rate              
Market Risk Benefit [Line Items]              
Market risk benefits, measurement input 0.016 0.015