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Other Long-Term Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Assets, Noncurrent [Abstract]    
Financing Receivable, after Allowance for Credit Loss, Noncurrent $ 84 $ 97
Financing Receivable, after Allowance for Credit Loss, Current 21 7
Prepaid long-term service agreements, noncurrent 62 64
Prepaid capital assets 29 28
Total other long-term assets 344 330
Other Long-Term Assets    
Loans and Leases Receivable, Allowance 2 3
Other Assets, Miscellaneous, Current 13 19
Other Intangible Assets, Net 35 15
Prepaid long-term service agreements, noncurrent 62 64
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount, Long-term 44  
Prepaid long-term service agreements, current 7 25
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount 56 55
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount Current 12 12
Other Noncurrent Assets [Member]    
Assets, Noncurrent [Abstract]    
Other Assets, Miscellaneous, Noncurrent 88 67
Other Long-Term Assets    
Other Assets, Miscellaneous, Noncurrent 88 67
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount, Long-term   47
Other current assets    
Other Long-Term Assets    
Other Intangible Assets, Net 13 7
EnergyRight loan reserve    
Other Long-Term Assets    
Loans and Leases Receivable, Allowance 1 1
Economic development loan collective reserve    
Other Long-Term Assets    
Loans and Leases Receivable, Allowance 0 1
Economic development loan specific loan reserve    
Other Long-Term Assets    
Loans and Leases Receivable, Allowance 1 1
Other Noncurrent Assets [Member]    
Assets, Noncurrent [Abstract]    
Commodity contract derivative assets 2 12
Other Long-Term Assets    
Commodity contract derivative assets $ 2 $ 12
Energy Right    
Other Long-Term Assets    
Number of days in default 180 days  
Minimum | Energy Right    
Other Long-Term Assets    
EnergyRight loan terms 5 years  
Maximum | Energy Right    
Other Long-Term Assets    
EnergyRight loan terms 10 years