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Inventories
 6 Months Ended
Jun. 30, 2015
Inventory Disclosure [Abstract]  
Inventories [Text Block]
Inventories
 Inventories of liquid hydrocarbons, natural gas and bitumen are carried at the lower of cost or market value. Materials and supplies are valued at weighted average cost and reviewed for obsolescence or impairment when market conditions indicate.
 
June 30,
 
December 31,
(In millions)
2015
 
2014
Liquid hydrocarbons, natural gas and bitumen
$
50

 
$
58

Supplies and other items
286

 
299

Inventories, at cost
$
336

 
$
357