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Debt and Other Obligations (Tables) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2024
Debt Disclosure [Abstract] |  |
Debt Outstanding |  | Total debt outstanding at March 31, 2024, and September 30, 2023, consisted of the following:
Debt Outstanding (in millions)
| At March 31, 2024 |  | At September 30, 2023
Short-term debt |  |  |
Short-term debt, net of discounts | $ | 819 |  |  | $ | 432 |
Current maturities of power bonds issued at par | 1,022 |  |  | 1,022 |
Current maturities of long-term debt of VIEs issued at par | 36 |  |  | 35 |
Total current debt outstanding, net | 1,877 |  |  | 1,489 |
Long-term debt |  |  |
Long-term power bonds(1) | 17,986 |  |  | 17,970 |
Long-term debt of VIEs, net | 915 |  |  | 933 |
Unamortized discounts, premiums, issue costs, and other | (120) |  |  | (126) |
Total long-term debt, net | 18,781 |  |  | 18,777 |
Total debt outstanding | $ | 20,658 |  |  | $ | 20,266 |
Note (1) Includes total net exchange gain from currency transactions of $92 million and $109 million at March 31, 2024, and September 30, 2023, respectively.
Debt Securities Activity |  | Debt Securities Activity The table below summarizes the long-term debt securities activity for the period from October 1, 2023, to March 31, 2024:
Debt Securities Activity
|  | Date |  | Amount (in millions) |  |
Redemptions/Maturities(1) |  |  |  |  |  |
2009 Series B |  | December 2023 |  | $ | 1 |  |  |
Total redemptions/maturities of power bonds |  |  |  | 1 |  |  |
Debt of variable interest entities |  |  |  | 17 |  |  |
Total redemptions/maturities of debt |  |  |  | $ | 18 |  |  |
Note (1) All redemptions were at 100 percent of par.
Summary of Long-Term Credit Facilities |
Summary of Long-Term Credit Facilities At March 31, 2024 (in millions)
Maturity Date |  | Facility Limit |  | Letters of Credit Outstanding |  | Cash Borrowings |  | Availability
February 2025 |  | $ | 500 |  |  | $ | 317 |  |  | $ | — |  |  | $ | 183 |
March 2026 |  | 150 |  |  | 38 |  |  | — |  |  | 112 |
September 2026 |  | 1,000 |  |  | 60 |  |  | — |  |  | 940 |
March 2027 |  | 1,000 |  |  | 101 |  |  | — |  |  | 899 |
Total |  | $ | 2,650 |  |  | $ | 516 |  |  | $ | — |  |  | $ | 2,134 |

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