Inventory (Tables)

9 Months Ended

Sep. 30, 2014

Inventory Disclosure [Abstract]

Inventory Balance By Type

The following table summarizes the Company’s inventory balances as of the periods indicated:

	September 30, 2014		December 31, 2013
	(in millions)
Coal, fuel oil and other raw materials	$	375	$	334
Spare parts and supplies	366		350
Total	$	741	$	684