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Inventories (Tables)
12 Months Ended
Dec. 31, 2014
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current
 
December 31,
(In millions)
2014
 
2013
Liquid hydrocarbons, natural gas and bitumen
$
58

 
$
55

Supplies and other items
299

 
309

Inventories at cost
$
357

 
$
364