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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