EXPLORATION AND EVALUATION ASSETS (Tables)

12 Months Ended

Dec. 31, 2017

Exploration For And Evaluation Of Mineral Resources [Abstract]

Detailed information about exploration and evaluation assets

	Exploration and Production								Oil Sands Mining and Upgrading		Total
	North America			North Sea		Offshore Africa
Cost
At December 31, 2015	$	2,500		$	—	$	86		$	—	$	2,586
Additions	20			—		9			—		29
Transfers to property, plant and    equipment	(211		)	—		—			—		(211		)
Disposals/derecognitions	(3		)	—		(18		)	—		(21		)
Foreign exchange adjustments	—			—		(1		)	—		(1		)
At December 31, 2016	2,306			—		76			—		2,382
Additions	144			—		15			—		159
Acquisition of AOSP and other assets (note 7)	31			—		—			259		290
Transfers to property, plant and equipment	(198		)	—		—			—		(198		)
Disposals/derecognitions	(1		)	—		—			—		(1		)
At December 31, 2017	$	2,282		$	—	$	91		$	259	$	2,632