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Debt and Other Obligations (Tables) | 6 Months Ended
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Mar. 31, 2025
Debt Disclosure [Abstract] |
Debt Outstanding | Total debt outstanding at March 31, 2025, and September 30, 2024, consisted of the following:
Debt Outstanding (in millions)
| At March 31, 2025 |  | At September 30, 2024
Short-term debt |  |  |
Short-term debt, net of discounts | $ | 351 |  |  | $ | 1,167 |
Current maturities of power bonds issued at par | 2,372 |  |  | 1,022 |
Current maturities of long-term debt of VIEs issued at par | 47 |  |  | 37 |
Total current debt outstanding, net | 2,770 |  |  | 2,226 |
Long-term debt |  |  |
Long-term power bonds(1) | 17,876 |  |  | 17,995 |
Long-term debt of VIEs, net | 1,656 |  |  | 897 |
Unamortized discounts, premiums, issue costs, and other | (147) |  |  | (128) |
Total long-term debt, net | 19,385 |  |  | 18,764 |
Total debt outstanding | $ | 22,155 |  |  | $ | 20,990 |
Note (1) Includes total net exchange gain from currency transactions of $80 million and $62 million at March 31, 2025, and September 30, 2024, respectively.
Debt Securities Activity | Debt Securities Activity The table below summarizes the long-term debt securities activity for the period from October 1, 2024, to March 31, 2025:
Debt Securities Activity
|  | Date |  | Amount (in millions) |  |
Issues |  |  |  |  |  |
Debt of variable interest entities |  | October 2024 |  | $ | 800 |  |  |
2025 Series A(1) |  | February 2025 |  | 1,250 |  |  |
Discount on debt issues |  |  |  | (19) |  |  |
Total long-term debt issues |  |  |  | $ | 2,031 |  |  |
Redemptions/Maturities(2) |  |  |  |  |  |
2009 Series B |  | December 2024 |  | $ | 1 |  |  |
Total redemptions/maturities of power bonds |  |  |  | 1 |  |  |
Debt of variable interest entities |  |  |  | 18 |  |  |
Total redemptions/maturities of debt |  |  |  | $ | 19 |  |  |
Notes (1) The 2025 Series A Bonds were issued at 98.517 percent of par. (2) All redemptions were at 100 percent of par.
Summary of Long-Term Credit Facilities |
Summary of Credit Facilities At March 31, 2025 (in millions)
Maturity Date |  | Facility Limit |  | Letters of Credit Outstanding |  | Cash Borrowings |  | Availability
March 2026 |  | $ | 150 |  |  | $ | 38 |  |  | $ | — |  |  | $ | 112 |
September 2026 |  | 1,000 |  |  | 122 |  |  | — |  |  | 878 |
March 2027 |  | 1,000 |  |  | 197 |  |  | — |  |  | 803 |
February 2028 |  | 500 |  |  | 214 |  |  | — |  |  | 286 |
Total |  | $ | 2,650 |  |  | $ | 571 |  |  | $ | — |  |  | $ | 2,079 |

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