Inventory (Tables)

9 Months Ended

Sep. 30, 2013

Inventory Disclosure [Abstract]

Inventory Balance By Type

The following table summarizes the Company’s inventory balances as of September 30, 2013 and December 31, 2012:

	September 30, 2013		December 31, 2012
	(in millions)
Coal, fuel oil and other raw materials	$	345	$	371
Spare parts and supplies	366		351
Total	$	711	$	722