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Inventories (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Inventory |  |  |
Total inventories | $ 548 | $ 469 | $ 279
Non-utility LPG and natural gas |  |  |
Inventory |  |  |
Total inventories | 352 | 278 | 181
Gas Utility natural gas |  |  |
Inventory |  |  |
Total inventories | 65 | 68 | 19
Energy certificates |  |  |
Inventory |  |  |
Total inventories | 60 | 53 | 3
Materials, supplies and other |  |  |
Inventory |  |  |
Total inventories | $ 71 | $ 70 | $ 76

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