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Inventories, Net (Details) - USD ($) $ in Millions	Jun. 30, 2015	Sep. 30, 2014
Inventories, Net
Fuel inventory	$ 513	$ 473
Materials and supplies inventory	648	616
Emission allowance inventory, net	13	13
Allowance for inventory obsolescence	(48)	(46)
Inventories, net	$ 1,126	$ 1,056

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