Inventory (Tables)

12 Months Ended

Dec. 31, 2013

Inventory Disclosure [Abstract]

Inventory Balance By Type

The following table summarizes the Company’s inventory balances as of December 31, 2013 and 2012 :

	2013		2012
	(in millions)
Coal, fuel oil and other raw materials	$	334	$	372
Spare parts and supplies	350		347
Total	$	684	$	719