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Inventories, Net (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Sep. 30, 2022
Inventories, Net    
Materials and supplies inventory $ 824 $ 808
Fuel inventory 426 303
Renewable energy certificates/emission allowance inventory, net 19 18
Allowance for inventory obsolescence (62) (57)
Inventories, net $ 1,207 $ 1,072