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PROPERTY, PLANT AND EQUIPMENT (Tables)
 12 Months Ended
Dec. 31, 2017
Property, plant and equipment [abstract]  
Detailed information about property, plant and equipment
 
Exploration and Production
 
Oil Sands
 Mining and Upgrading

 
Midstream

 
Head
Office

 
Total

 
North
America

 
North Sea

 
Offshore
Africa

 
 
 
 
 
 
 
 
Cost
 
 
 
 
 
 
 
 
 
 
 
 
 
At December 31, 2015
$
60,540

 
$
7,414

 
$
5,173

 
$
24,343

 
$
577

 
$
378

 
$
98,425

Additions
1,462

 
186

 
116

 
2,822

 
6

 
17

 
4,609

Transfers from E&E assets
211

 
—

 
—

 
—

 
—

 
—

 
211

Disposals/derecognitions
(566
)
 
—

 
—

 
(127
)
 
(349
)
 
—

 
(1,042
)
Foreign exchange adjustments and other
—

 
(220
)
 
(157
)
 
—

 
—

 
—

 
(377
)
At December 31, 2016
61,647

 
7,380

 
5,132

 
27,038

 
234

 
395

 
101,826

Additions (1)
3,003

 
255

 
101

 
1,660

 
194

 
19

 
5,232

Acquisition of AOSP and other assets (note 7)
349

 
—

 
—

 
13,832

 
—

 
—

 
14,181

Transfers from E&E assets
198

 
—

 
—

 
—

 
—

 
—

 
198

Disposals/derecognitions
(381
)
 
—

 
—

 
(446
)
 
—

 
—

 
(827
)
Foreign exchange adjustments and other
—

 
(509
)
 
(352
)
 
—

 
—

 
—

 
(861
)
At December 31, 2017
$
64,816

 
$
7,126

 
$
4,881

 
$
42,084

 
$
428

 
$
414

 
$
119,749

Accumulated depletion and depreciation
 
 

 
 

 
 

 
 

 
 

At December 31, 2015
$
35,347

 
$
5,264

 
$
3,659

 
$
2,294

 
$
132

 
$
254

 
$
46,950

Expense
3,440

 
457

 
243

 
662

 
11

 
27

 
4,840

Disposals/derecognitions
(486
)
 
—

 
—

 
(127
)
 
(28
)
 
—

 
(641
)
Foreign exchange adjustments and other
10

 
(137
)
 
(105
)
 
(1
)
 
—

 
—

 
(233
)
At December 31, 2016
38,311

 
5,584

 
3,797

 
2,828

 
115

 
281

 
50,916

Expense
3,220

 
509

 
205

 
1,220

 
9

 
23

 
5,186

Disposals/derecognitions
(381
)
 
—

 
—

 
(446
)
 
—

 
—

 
(827
)
Foreign exchange adjustments and other
1

 
(440
)
 
(283
)
 
26

 
—

 
—

 
(696
)
At December 31, 2017
$
41,151

 
$
5,653

 
$
3,719

 
$
3,628

 
$
124

 
$
304

 
$
54,579

Net book value
 
 
 
 
 
 
 
 
 
 
 
 
 
 - at December 31, 2017
$
23,665

 
$
1,473

 
$
1,162

 
$
38,456

 
$
304

 
$
110

 
$
65,170

 - at December 31, 2016
$
23,336

 
$
1,796

 
$
1,335

 
$
24,210

 
$
119

 
$
114

 
$
50,910

(1)
Additions in Midstream include the revaluation of a previously held joint interest in certain pipeline system assets.
Project costs not subject to depletion and depreciation
 
2017

 
2016

Kirby Thermal Oil Sands – North
 
$
944

 
$
846