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Inventories - Components of Inventories (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Sep. 30, 2022 | Mar. 31, 2022
--- | --- | --- | ---
Inventory |  |  |
Total inventories | $ 433 | $ 665 | $ 398
Non-utility LPG and natural gas |  |  |
Inventory |  |  |
Total inventories | 230 | 335 | 253
Gas Utility natural gas |  |  |
Inventory |  |  |
Total inventories | 20 | 166 | 6
Energy certificates |  |  |
Inventory |  |  |
Total inventories | 76 | 70 | 63
Materials, supplies and other |  |  |
Inventory |  |  |
Total inventories | $ 107 | $ 94 | $ 76

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