Inventory (Tables)

3 Months Ended

Mar. 31, 2014

Inventory Disclosure [Abstract]

Inventory Balance By Type

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

	March 31, 2014		December 31, 2013
	(in millions)
Coal, fuel oil and other raw materials	$	324	$	334
Spare parts and supplies	363		350
Total	$	687	$	684