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Debt and Other Obligations Debt Securities Activity (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2022
Debt Instrument |  |  |  |
Total long-term debt, net |  | $ 18,833 |  | $ 18,794
Redemptions and repurchases of power bonds |  | 1 | $ 1 |
Total redemptions/maturities of debt | [1] | (1) |  |
2009 Series B [Member] |  |  |  |
Debt Instrument |  |  |  |
Redemptions and repurchases of power bonds |  | $ 1 |  |
[1] | (1) All redemptions were at 100 percent of par.

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