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Debt and Other Obligations (Tables) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2024
Debt Disclosure [Abstract] |  |
Debt Outstanding |  | Total debt outstanding at June 30, 2024, and September 30, 2023, consisted of the following:
Debt Outstanding (in millions)
| At June 30, 2024 |  | At September 30, 2023
Short-term debt |  |  |
Short-term debt, net of discounts | $ | 1,112 |  |  | $ | 432 |
Current maturities of power bonds issued at par | 2,022 |  |  | 1,022 |
Current maturities of long-term debt of VIEs issued at par | 36 |  |  | 35 |
Total current debt outstanding, net | 3,170 |  |  | 1,489 |
Long-term debt |  |  |
Long-term power bonds(1) | 16,966 |  |  | 17,970 |
Long-term debt of VIEs, net | 915 |  |  | 933 |
Unamortized discounts, premiums, issue costs, and other | (118) |  |  | (126) |
Total long-term debt, net | 17,763 |  |  | 18,777 |
Total debt outstanding | $ | 20,933 |  |  | $ | 20,266 |
Note (1) Includes total net exchange gain from currency transactions of $91 million and $109 million at June 30, 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 June 30, 2024:
Debt Securities Activity
|  | Date |  | Amount (in millions) |  |
Redemptions/Maturities(1) |  |  |  |  |  |
2009 Series B |  | December 2023 |  | $ | 1 |  |  |
2009 Series B |  | June 2024 |  | 21 |  |  |
Total redemptions/maturities of power bonds |  |  |  | 22 |  |  |
Debt of variable interest entities |  |  |  | 17 |  |  |
Total redemptions/maturities of debt |  |  |  | $ | 39 |  |  |
Note (1) All redemptions were at 100 percent of par.
Summary of Long-Term Credit Facilities |
Summary of Long-Term Credit Facilities At June 30, 2024 (in millions)
Maturity Date |  | Facility Limit |  | Letters of Credit Outstanding |  | Cash Borrowings |  | Availability
March 2026 |  | $ | 150 |  |  | $ | 38 |  |  | $ | — |  |  | $ | 112 |
September 2026 |  | 1,000 |  |  | 85 |  |  | — |  |  | 915 |
March 2027 |  | 1,000 |  |  | 109 |  |  | — |  |  | 891 |
February 2028 |  | 500 |  |  | 214 |  |  | — |  |  | 286 |
Total |  | $ | 2,650 |  |  | $ | 446 |  |  | $ | — |  |  | $ | 2,204 |

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