Inventory

6 Months Ended

Jun. 30, 2016

Inventory Disclosure [Abstract]

INVENTORY

INVENTORY

The following table summarizes the Company’s inventory balances as of the periods indicated (in millions):

	June 30, 2016		December 31, 2015
Fuel and other raw materials	$	312	$	343
Spare parts and supplies	343		328
Total	$	655	$	671