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Other Long-Term Assets (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2023	Sep. 30, 2022
Other Long-Term Assets
EnergyRight® receivables, net	$ 61	$ 62
Prepaid Expense, Noncurrent	72	74
Total other long-term assets	335	394
Prepaid Expense, Current	25	12
Loans and Leases Receivable, Allowance	3	3
Financing Receivable, after Allowance for Credit Loss, Current	4	6
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	1	1
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	13	13
Other long-term assets
Other Long-Term Assets
Loans and other long-term receivables, net	115	99
EnergyRight® receivables, net	48	49
Other	94	70
Other long-term assets
Other Long-Term Assets
Commodity Contract Asset, Noncurrent	$ 6	$ 102
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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The number of days in default that are determined to be uncollectible.

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