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Debt and Other Obligations Debt Securities Activity (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Oct. 02, 2024 | Sep. 30, 2024
Debt Instrument |  |  |  |  |
Total long-term debt, net |  | $ 18,160 |  |  | $ 18,764
Repayments of Unsecured Debt |  | 1 | $ 1 |  |
Amount of letters of credit outstanding |  | $ 6 |  |  |
Percent of par value | [1] | 100.00% |  |  |
Long-term power bonds, net |  | $ 16,485 |  |  | $ 17,867
Debt Instrument, Redemption, Description |  | 1 |  |  |
Proceeds from Issuance of Debt |  | $ 800 | $ 0 |  |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Debt Instrument |  |  |  |  |
Debt and Lease Obligation |  |  |  | $ 800 |
2009 series B |  |  |  |  |
Debt Instrument |  |  |  |  |
Repayments of Unsecured Debt |  | $ 1 |  |  |
[1] | (1) All redemptions were at 100 percent of par.

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