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Revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Off-system sales $ 8 $ 14 $ 19
Electric revenue $ (12,123) (11,888) (12,352)
Pandemic Relief Credit   $ (225) $ 228
Revenue from Contract with Customer [Abstract]      
Percent of Pandemic Credit Offered 2.50%