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v3.25.2

Subsequent Event (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Sep. 30, 2024
Subsequent Event [Line Items] |  |  |  |  |  |
Repayments of Unsecured Debt |  |  | $ 1,022 | [1] | $ 22 |
Current regulatory assets | $ 152 |  | 152 |  |  | $ 191
Interest expense | 307 | $ 267 | 880 |  | $ 795 |
Non-current regulatory assets | 9,137 |  | 9,137 |  |  | 9,408
Unrealized gains/losses on commodity derivatives |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Current regulatory assets | 22 |  | 22 |  |  | 102
Non-current regulatory assets | $ 8 |  | $ 8 |  |  | $ 64
[1] | (3) All redemptions were at 100 percent of par.

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