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Debt and Other Obligations Debt and Other Obligations - Debt Outstanding (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023
Short-term debt |  |  |
Short-term debt, net of discounts |  | $ 1,167 | $ 432
Current maturities of long-term debt of variable interest entities issued at par |  | 37 | 35
Total Current maturities of power bonds issued at par |  | 1,022 | 1,022
Total current debt outstanding, net |  | 2,226 | 1,489
Long-term debt |  |  |
Long-term power bonds, net |  | 17,867 | 17,844
Long-term power bonds | [1] | 17,995 | 17,970
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net |  | (128) | (126)
Long-term debt of variable interest entities, net |  | 897 | 933
Total long-term debt, net |  | $ 18,764 | 18,777
880591DX7 |  |  |
Short-term debt |  |  |
Coupon rate |  | 4.65% |
Debt Instrument, Maturity Date |  | Jun. 15, 2035 |
Long-term debt |  |  |
Long-term power bonds, net |  | $ 436 | 436
880591EF5 |  |  |
Short-term debt |  |  |
Coupon rate |  | 3.77% |
Debt Instrument, Maturity Date |  | Jun. 15, 2034 |
Long-term debt |  |  |
Long-term power bonds, net |  | $ 116 | 139
880591CJ9 |  |  |
Short-term debt |  |  |
Coupon rate |  | 6.75% |
Debt Instrument, Maturity Date |  | Nov. 01, 2025 |
Long-term debt |  |  |
Long-term power bonds, net |  | $ 1,350 | 1,350
880591EU2 [Member] |  |  |
Short-term debt |  |  |
Coupon rate |  | 2.875% |
Debt Instrument, Maturity Date |  | Feb. 01, 2027 |
Long-term debt |  |  |
Long-term power bonds, net |  | $ 1,000 | 1,000
880591300 |  |  |
Short-term debt |  |  |
Coupon rate |  | 2.134% |
Debt Instrument, Maturity Date |  | Jun. 01, 2028 |
Long-term debt |  |  |
Long-term power bonds, net |  | $ 256 | 256
880591409 |  |  |
Short-term debt |  |  |
Coupon rate |  | 2.216% |
Debt Instrument, Maturity Date |  | May 01, 2029 |
Long-term debt |  |  |
Long-term power bonds, net |  | $ 208 | 208
880591DM1 |  |  |
Short-term debt |  |  |
Coupon rate |  | 7.125% |
Debt Instrument, Maturity Date |  | May 01, 2030 |
Long-term debt |  |  |
Long-term power bonds, net |  | $ 1,000 | 1,000
880591DV1 |  |  |
Short-term debt |  |  |
Coupon rate |  | 4.70% |
Debt Instrument, Maturity Date |  | Jul. 15, 2033 |
Long-term debt |  |  |
Long-term power bonds, net |  | $ 472 | 472
880591DP4 |  |  |
Short-term debt |  |  |
Coupon rate |  | 6.587% |
Debt Instrument, Maturity Date |  | Jun. 07, 2032 |
Long-term debt |  |  |
Long-term power bonds, net |  | $ 335 | 305
880591CK6 |  |  |
Short-term debt |  |  |
Coupon rate |  | 5.98% |
Debt Instrument, Maturity Date |  | Apr. 01, 2036 |
Long-term debt |  |  |
Long-term power bonds, net |  | $ 121 | 121
880591CS9 |  |  |
Short-term debt |  |  |
Coupon rate |  | 5.88% |
Debt Instrument, Maturity Date |  | Apr. 01, 2036 |
Long-term debt |  |  |
Long-term power bonds, net |  | $ 1,500 | 1,500
880591CP5 |  |  |
Short-term debt |  |  |
Coupon rate |  | 6.15% |
Debt Instrument, Maturity Date |  | Jan. 15, 2038 |
Long-term debt |  |  |
Long-term power bonds, net |  | $ 1,000 | 1,000
880591ED0 |  |  |
Short-term debt |  |  |
Coupon rate |  | 5.50% |
Debt Instrument, Maturity Date |  | Jun. 15, 2038 |
Long-term debt |  |  |
Long-term power bonds, net |  | $ 500 | 500
880591EH1 |  |  |
Short-term debt |  |  |
Coupon rate |  | 5.25% |
Debt Instrument, Maturity Date |  | Sep. 15, 2039 |
Long-term debt |  |  |
Long-term power bonds, net |  | $ 2,000 | 2,000
880591EP3 |  |  |
Short-term debt |  |  |
Coupon rate |  | 3.50% |
Debt Instrument, Maturity Date |  | Dec. 15, 2042 |
Long-term debt |  |  |
Long-term power bonds, net |  | $ 1,000 | 1,000
880591DU3 |  |  |
Short-term debt |  |  |
Coupon rate |  | 4.962% |
Debt Instrument, Maturity Date |  | Jun. 07, 2043 |
Long-term debt |  |  |
Long-term power bonds, net |  | $ 201 | 183
880591EB4 |  |  |
Short-term debt |  |  |
Coupon rate |  | 4.875% |
Debt Instrument, Maturity Date |  | Jan. 15, 2048 |
Long-term debt |  |  |
Long-term power bonds, net |  | $ 500 | 500
880591DZ2 |  |  |
Short-term debt |  |  |
Coupon rate |  | 5.375% |
Debt Instrument, Maturity Date |  | Apr. 01, 2056 |
Long-term debt |  |  |
Long-term power bonds, net |  | $ 1,000 | 1,000
880591EJ7 |  |  |
Short-term debt |  |  |
Coupon rate |  | 4.625% |
Debt Instrument, Maturity Date |  | Sep. 15, 2060 |
Long-term debt |  |  |
Long-term power bonds, net |  | $ 1,000 | 1,000
880591ES7 |  |  |
Short-term debt |  |  |
Coupon rate |  | 4.25% |
Debt Instrument, Maturity Date |  | Sep. 15, 2065 |
Long-term debt |  |  |
Long-term power bonds, net |  | $ 1,000 | 1,000
880591EW8 [Member] |  |  |
Short-term debt |  |  |
Coupon rate |  | 0.75% |
Debt Instrument, Maturity Date |  | May 15, 2025 |
Long-term debt |  |  |
Long-term power bonds, net |  | $ 0 | 1,000
880591EX6 |  |  |
Short-term debt |  |  |
Coupon rate |  | 1.50% |
Debt Instrument, Maturity Date |  | Sep. 15, 2031 |
Long-term debt |  |  |
Long-term power bonds, net |  | $ 500 | 500
880591EY4 |  |  |
Short-term debt |  |  |
Coupon rate |  | 4.25% |
Debt Instrument, Maturity Date |  | Sep. 15, 2052 |
Long-term debt |  |  |
Long-term power bonds, net |  | $ 500 | 500
880591EZ1 |  |  |
Short-term debt |  |  |
Coupon rate |  | 3.875% |
Debt Instrument, Maturity Date |  | Mar. 15, 2028 |
Long-term debt |  |  |
Long-term power bonds, net |  | $ 1,000 | 1,000
880591FB3 |  |  |
Short-term debt |  |  |
Coupon rate |  | 4.375% |
Debt Instrument, Maturity Date |  | Aug. 01, 2034 |
Long-term debt |  |  |
Long-term power bonds, net |  | $ 1,000 | $ 0
[1] | nclude total net exchange gain from currency transactions of $62 million and $109 million at September 30, 2024 and 2023

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