XML 83 R11.htm IDEA: XBRL DOCUMENT v3.20.1
Inventory
3 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
INVENTORY INVENTORY
The following table summarizes the Company’s inventory balances as of the periods indicated (in millions):
 
March 31, 2020
 
December 31, 2019
Fuel and other raw materials
$
203

 
$
230

Spare parts and supplies
258

 
257

Total
$
461

 
$
487