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Subsequent Event (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Sep. 30, 2023
Subsequent Event [Line Items] |  |  |  |  |  |
Repayments of Unsecured Debt |  |  | $ 1 | [1] | $ 1 |
Current regulatory assets | $ 230 |  | 230 |  |  | $ 178
Interest expense | 266 | $ 268 | 528 |  | $ 530 |
Non-current regulatory assets | 5,540 |  | 5,540 |  |  | 5,566
Unrealized gains/losses on commodity derivatives |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Current regulatory assets | 191 |  | 191 |  |  | 136
Non-current regulatory assets | $ 80 |  | $ 80 |  |  | $ 52
[1] | (1) All redemptions were at 100 percent of par.

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