Inventory

3 Months Ended

Mar. 31, 2016

Inventory Disclosure [Abstract]

INVENTORY

INVENTORY

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

	March 31, 2016		December 31, 2015
Fuel and other raw materials	$	354	$	343
Spare parts and supplies	328		332
Total	$	682	$	675