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Debt and Other Obligations (Tables)

6 Months Ended

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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