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Debt and Other Obligations Debt Securities Activity (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2023 | Mar. 31, 2022 | Sep. 30, 2022
Debt Instrument |  |  |  |  |  |
Total long-term debt, net |  | $ 19,816 | $ 19,816 |  |  | $ 18,794
Redemptions and repurchases of power bonds |  |  | 1 | [1] | $ 1 |
Total redemptions/maturities of debt | [1] |  | (23) |  |  |
Proceeds from Issuance of Debt |  |  | 992 |  | 0 |
Debt Instrument, Unamortized Discount |  | (8) | (8) |  |  |
Amount of letters of credit outstanding |  | $ 6 | $ 6 |  |  |
Percent of par value |  | 99.187% | 99.187% |  |  |
Long-term power bonds, net |  | $ 18,865 | $ 18,865 |  |  | $ 17,826
Repayments of Other Long-term Debt |  |  | 22 |  | $ 21 |
2023 Series A |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Long-term power bonds, net |  | $ 1,000 | $ 1,000 |  |  |
Total |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Percent of par value |  | 100.00% | 100.00% |  |  |
2009 Series B [Member] |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Redemptions and repurchases of power bonds |  | $ 1 |  |  |  |
Debt of variable interest entities [Member] |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Repayments of Other Long-term Debt |  | $ 22 |  |  |  |
[1] | (1) The 2023 Series A Bonds were issued at 99.187 percent of par. (2) All redemptions were at 100 percent of par.

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