Inventories

3 Months Ended

Mar. 31, 2016

Inventory Disclosure [Abstract]

Inventories [Text Block]

Inventories

 Liquid hydrocarbons, natural gas and bitumen are recorded at weighted average cost and carried at the lower of cost or market value. Supplies and other items consist principally of tubular goods and equipment which are valued at weighted average cost and reviewed periodically for obsolescence or impairment when market conditions indicate.

	March 31,		December 31,
(In millions)	2016		2015
Liquid hydrocarbons, natural gas and bitumen	$	33	$	35
Supplies and other items	273		278
Inventories, at cost	$	306	$	313