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Other Long-Term Assets (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021
Other Long-Term Assets |  |
EnergyRight® receivables, net | $ 69 | $ 71
Prepaid Expense, Noncurrent | 40 | 44
Total other long-term assets | 307 | 320
Prepaid Expense, Current | 6 | 12
Loans and Leases Receivable, Allowance | 4 | 4
Financing Receivable, after Allowance for Credit Loss, Current | 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 | 101 | 96
EnergyRight® receivables, net | 55 | 57
Other | 86 | 83
Other long-term assets |  |
Other Long-Term Assets |  |
Commodity Contract Asset, Noncurrent | $ 25 | $ 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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