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Plant Closures (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended 57 Months Ended
Sep. 30, 2024
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Property, Plant and Equipment [Abstract]          
Accelerated depreciation     $ 177 $ 140 $ 659
Completed Plant          
Accelerated depreciation     177 140 659
Depreciation   $ 1,800 1,900 $ 1,800  
Accumulated depreciation $ 38,793 38,793 $ 35,871   $ 35,871
Cumberland          
Property, Plant and Equipment [Abstract]          
Accelerated depreciation 16 112      
Completed Plant          
Accelerated depreciation 16 112      
Kingston          
Property, Plant and Equipment [Abstract]          
Accelerated depreciation 9 18      
Completed Plant          
Accelerated depreciation $ 9 $ 18      
Property, Plant and Equipment [Member]          
Completed Plant          
Property, Plant and Equipment, Dispositions   15 million 14 million 22 million