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Inventories - Components of Inventories (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Inventory |  |  |
Total inventories | $ 618 | $ 665 | $ 548
Non-utility LPG and natural gas |  |  |
Inventory |  |  |
Total inventories | 310 | 335 | 352
Gas Utility natural gas |  |  |
Inventory |  |  |
Total inventories | 129 | 166 | 65
Energy certificates |  |  |
Inventory |  |  |
Total inventories | 78 | 70 | 60
Materials, supplies and other |  |  |
Inventory |  |  |
Total inventories | $ 101 | $ 94 | $ 71

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