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Inventories - Components of Inventories (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Sep. 30, 2021 | Mar. 31, 2021
--- | --- | --- | ---
Inventory |  |  |
Total inventories | $ 398 | $ 469 | $ 268
Non-utility LPG and natural gas |  |  |
Inventory |  |  |
Total inventories | 253 | 278 | 179
Gas Utility natural gas |  |  |
Inventory |  |  |
Total inventories | 6 | 68 | 3
Energy certificates |  |  |
Inventory |  |  |
Total inventories | 63 | 53 | 31
Materials, supplies and other |  |  |
Inventory |  |  |
Total inventories | $ 76 | $ 70 | $ 55

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