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Market Risk Benefits - Schedule of Reconciliation of Market Risk Benefits (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Dec. 31, 2023
Market Risk Benefit [Line Items]        
Liability $ 4,505 $ 3,655    
Annuities        
Market Risk Benefit [Line Items]        
Asset 1,110 856    
Liability 4,505 3,655    
Net Liability $ 3,395 $ 2,799 $ 2,967 $ 0