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Inventories, Net Inventories, Net (Tables)
12 Months Ended
Sep. 30, 2018
Inventory, Net [Abstract]  
Inventories, Net
The table below summarizes the types and amounts of TVA’s inventories:
Inventories, Net 
At September 30
 
2018
 
2017
Materials and supplies inventory
$
725

 
$
734

Fuel inventory
266

 
355

RECs/Emission allowance inventory, net
14

 
15

Allowance for inventory obsolescence
(44
)
 
(39
)
Inventories, net
$
961

 
$
1,065