Inventory (Notes)

12 Months Ended

Dec. 31, 2015

Inventory Disclosure [Abstract]

Inventory

Inventory

Inventory consisted of:

	As of December 31,
	2015		2014
	(In millions)
Fuel oil	$	312	$	375
Coal/Lignite	471		414
Natural gas	12		16
Spare parts	437		424
Other	20		18
Total Inventory	$	1,252	$	1,247

During the year ended December 31, 2015, the Company recorded a lower of weighted average cost or market adjustment related to fuel oil of $19 million.