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Inventories (Tables)
 6 Months Ended
Jun. 30, 2016
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
 
June 30,
 
December 31,
(In millions)
2016
 
2015
Liquid hydrocarbons, natural gas and bitumen
$
31

 
$
35

Supplies and other items
241

 
278

Inventories, at cost
$
272

 
$
313