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Debt and Other Obligations Debt Securities Activity (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Sep. 30, 2023
Debt Instrument |  |  |  |
Total long-term debt, net | $ 18,781 |  |  | $ 18,777
Repayments of Unsecured Debt | 1 | [1] | $ 1 |
Amount of letters of credit outstanding | $ 6 |  |  |
Percent of par value | 100.00% |  |  |
Long-term power bonds, net | $ 17,866 |  |  | $ 17,844
Repayments of Other Long-term Debt | $ 17 |  | $ 22 |
Debt Instrument, Redemption, Description | 18 |  |  |
[1] | (1) All redemptions were at 100 percent of par.

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