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Inventories, Net (Tables)
 6 Months Ended
Mar. 31, 2019
Inventory, Net [Abstract]  
Inventories, Net
The table below summarizes the types and amounts of TVA's inventories:
Inventories, Net 
 
At March 31, 2019
 
At September 30, 2018
Materials and supplies inventory
$
734

 
$
725

Fuel inventory
318

 
266

Renewable energy certificates/emission allowance inventory, net
16

 
14

Allowance for inventory obsolescence
(52
)
 
(44
)
Inventories, net
$
1,016

 
$
961