XML 17 R10.htm IDEA: XBRL DOCUMENT v2.4.0.8
Inventory
9 Months Ended
Sep. 30, 2013
Inventory Disclosure [Abstract]  
INVENTORY
INVENTORY
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