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Inventories - Components of Inventories (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Sep. 30, 2021 | Jun. 30, 2021
--- | --- | --- | ---
Inventory |  |  |
Total inventories | $ 496 | $ 469 | $ 296
Non-utility LPG and natural gas |  |  |
Inventory |  |  |
Total inventories | 261 | 278 | 187
Gas Utility natural gas |  |  |
Inventory |  |  |
Total inventories | 84 | 68 | 16
Energy certificates |  |  |
Inventory |  |  |
Total inventories | 70 | 53 | 42
Materials, supplies and other |  |  |
Inventory |  |  |
Total inventories | $ 81 | $ 70 | $ 51

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