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Plant Closures (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Completed Plant        
Depreciation   $ 1,900 $ 1,800 $ 1,900
Accumulated depreciation $ 38,716 38,716 $ 38,793  
Cumberland        
Property, Plant and Equipment [Abstract]        
Accelerated depreciation 16 176    
Completed Plant        
Accelerated depreciation 16 176    
Kingston        
Property, Plant and Equipment [Abstract]        
Accelerated depreciation 9 54    
Completed Plant        
Accelerated depreciation $ 9 $ 54    
Property, Plant and Equipment [Member]        
Completed Plant        
Property, Plant and Equipment, Dispositions   15 million 15 million 14 million