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Exploration and Evaluation Assets (Tables)

12 Months Ended

Dec. 31, 2020

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, 2018			$	2,348		$	—		$	37		$	252		$	2,637
Additions			38			—			33			—			71
Acquisition of Devon assets (note 7)			91			—			—			—			91
Transfers to property, plant and equipment			(219)			—			—			—			(219)
Foreign exchange adjustments			—			—			(1)			—			(1)

At December 31, 2019			2,258			—			69			252			2,579
Additions/Acquisitions			40			—			15			—			55

Transfers to property, plant and equipment			(194)			—			—			—			(194)
Derecognitions and other			(3)			—			—			—			(3)
Foreign exchange adjustments			—			—			(1)			—			(1)
At December 31, 2020			$	2,101		$	—		$	83		$	252		$	2,436