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Exploration and Evaluation Assets (Tables)
 12 Months Ended
Dec. 31, 2019
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, 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

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