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Inventories, Net (Tables) | 6 Months Ended
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Mar. 31, 2022
Inventory, Net [Abstract] |
Inventories, Net | The table below summarizes the types and amounts of TVA's inventories:
Inventories, Net (in millions)
| At March 31, 2022 |  | At September 30, 2021
Materials and supplies inventory | $ | 776 |  |  | $ | 775 |
Fuel inventory | 245 |  |  | 198 |
Renewable energy certificates inventory, net | 17 |  |  | 12 |
Allowance for inventory obsolescence | (50) |  |  | (35) |
Inventories, net | $ | 988 |  |  | $ | 950 |

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