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Subsequent Event (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Sep. 30, 2023
Subsequent Event [Line Items] |  |  |  |  |  |
Repayments of Unsecured Debt |  |  | $ 22 | [1] | $ 29 |
Current regulatory assets | $ 178 |  | 178 |  |  | $ 178
Interest expense | 267 | $ 264 | 795 |  | $ 794 |
Non-current regulatory assets | 8,809 |  | 8,809 |  |  | 5,566
Unrealized gains/losses on commodity derivatives |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Current regulatory assets | 122 |  | 122 |  |  | 136
Non-current regulatory assets | $ 59 |  | $ 59 |  |  | $ 52
[1] | (1) All redemptions were at 100 percent of par.

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