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Inventories, Net | 6 Months Ended
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Mar. 31, 2018
Inventory, Net [Abstract] |
Inventories, Net | Inventories, Net The table below summarizes the types and amounts of TVA's inventories:
Inventories, Net
| At March 31, 2018 |  | At September 30, 2017
Materials and supplies inventory | $ | 763 |  |  | $ | 734 |
Fuel inventory | 322 |  |  | 355 |
Renewable energy certificates/emission allowance inventory, net | 12 |  |  | 15 |
Allowance for inventory obsolescence | (50 | ) |  | (39 | )
Inventories, net | $ | 1,047 |  |  | $ | 1,065 |

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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