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Inventories (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2024
--- | --- | --- | ---
Inventory |  |  |
Total inventories | $ 359 | $ 411 | $ 379
Non-utility LPG and natural gas |  |  |
Inventory |  |  |
Total inventories | 159 | 195 | 186
Gas Utility natural gas |  |  |
Inventory |  |  |
Total inventories | 38 | 50 | 29
Energy certificates |  |  |
Inventory |  |  |
Total inventories | 64 | 69 | 60
Materials, supplies and other |  |  |
Inventory |  |  |
Total inventories | $ 98 | $ 97 | $ 104

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