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Inventories, Net (Tables)
 6 Months Ended
Mar. 31, 2020
Inventory, Net [Abstract]  
Inventories, Net
The table below summarizes the types and amounts of TVA's inventories:
Inventories, Net 
 
At March 31, 2020
 
At September 30, 2019
Materials and supplies inventory
$
773

 
$
742

Fuel inventory
328

 
294

Renewable energy certificates/emission allowance inventory, net
18

 
16

Allowance for inventory obsolescence
(48
)
 
(53
)
Inventories, net
$
1,071

 
$
999