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Market Risk Benefits - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Market Risk Benefit [Line Items]        
Change in fair value of market risk benefits $ (310) $ (134) $ (624) $ (292)
Annuities        
Market Risk Benefit [Line Items]        
Change in fair value of market risk benefits $ 202 $ (40)