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EXPLORATION AND EVALUATION ASSETS (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2016
$
2,306

$
—

$
76

$
—

$
2,382

Additions
144

—

15

—

159

Acquisition of AOSP and other assets (note 8)
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

Additions
245

—

35

222

502

Transfers to property, plant and equipment
(175
)
—

—

(222
)
(397
)
Disposals/derecognitions and other
(4
)
—

(89
)
(7
)
(100
)
At December 31, 2018
$
2,348

$
—

$
37

$
252

$
2,637