XML 43 R10.htm IDEA: XBRL DOCUMENT v3.8.0.1
Inventories, Net
6 Months Ended
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