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Inventories (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
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Public Utilities, Inventory |  |
Total inventories | $ 411 | $ 433
Non-utility LPG and natural gas |  |
Public Utilities, Inventory |  |
Total inventories | 195 | 212
Gas Utility natural gas |  |
Public Utilities, Inventory |  |
Total inventories | 50 | 55
Energy certificates |  |
Public Utilities, Inventory |  |
Total inventories | 69 | 64
Materials, supplies and other |  |
Public Utilities, Inventory |  |
Total inventories | $ 97 | $ 102

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