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Other Long-Term Assets (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2022	Sep. 30, 2021
Other Long-Term Assets
EnergyRight® receivables, net	$ 66	$ 71
Prepaid Expense, Noncurrent	58	44
Total other long-term assets	359	320
Prepaid Expense, Current	12	12
Loans and Leases Receivable, Allowance	4	4
Financing Receivable, after Allowance for Credit Loss, Current	4	3
EnergyRight loan reserve
Other Long-Term Assets
Loans and Leases Receivable, Allowance	1	1
Economic development loan specific loan reserve
Other Long-Term Assets
Loans and Leases Receivable, Allowance	2	2
Economic Development Loan Collective Reserve
Other Long-Term Assets
Loans and Leases Receivable, Allowance	1	1
Accounts Receivable [Member]
Other Long-Term Assets
EnergyRight® receivables, net	14	15
Other long-term assets
Other Long-Term Assets
Loans and other long-term receivables, net	117	96
EnergyRight® receivables, net	52	57
Other	79	83
Other long-term assets
Other Long-Term Assets
Commodity Contract Asset, Noncurrent	$ 53	$ 40
Energy Right
Other Long-Term Assets
Number of days in default	180 days
Energy Right | Minimum
Other Long-Term Assets
Debt Instrument, Term	5 years
Energy Right | Maximum
Other Long-Term Assets
Debt Instrument, Term	10 years

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