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Market Risk Benefits - Schedule of Reconciliation of Market Risk Benefits (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Dec. 31, 2022
Market Risk Benefit [Line Items]      
Asset $ 758 $ 34  
Liability 3,725 34  
Net Liability 2,967 0  
Annuity      
Market Risk Benefit [Line Items]      
Asset 758 34  
Liability 3,725 34  
Net Liability $ 2,967 $ 0 $ 44