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PROPERTY, PLANT AND EQUIPMENT (Tables)
 12 Months Ended
Dec. 31, 2018
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, 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 8)

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

Additions (2)
2,428

 
237

 
212

 
1,050

 
13

 
21

 
3,961

Transfers from E&E assets
175

 
—

 
—

 
222

 
—

 
—

 
397

Disposals/derecognitions
(412
)
 
(703
)
 
(70
)
 
(209
)
 
—

 
—

 
(1,394
)
Foreign exchange adjustments and other
—

 
661

 
448

 
—

 
—

 
—

 
1,109

At December 31, 2018
$
67,007

 
$
7,321

 
$
5,471

 
$
43,147

 
$
441

 
$
435

 
$
123,822

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Accumulated depletion and depreciation
 
 

 
 

 
 

 
 

 
 

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

Expense
3,111

 
257

 
201

 
1,557

 
14

 
21

 
5,161

Disposals/derecognitions
(393
)
 
(703
)
 
(70
)
 
(209
)
 
—

 
—

 
(1,375
)
Foreign exchange adjustments and other
12

 
528

 
353

 
5

 
—

 
—

 
898

At December 31, 2018
$
43,881

 
$
5,735

 
$
4,203

 
$
4,981

 
$
138

 
$
325

 
$
59,263

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net book value
 
 
 
 
 
 
 
 
 
 
 
 
 
 - at December 31, 2018
$
23,126

 
$
1,586

 
$
1,268

 
$
38,166

 
$
303

 
$
110

 
$
64,559

 - at December 31, 2017
$
23,665

 
$
1,473

 
$
1,162

 
$
38,456

 
$
304

 
$
110

 
$
65,170

(1)
Additions in Midstream include a pre-tax revaluation gain of $114 million of a previously held joint interest in certain pipeline system assets.
(2)
Additions in North Sea include a pre-tax revaluation gain of $19 million relating to acquisitions of its previously held interest.
Project costs not subject to depletion and depreciation
 
2018

 
2017

Kirby Thermal Oil Sands – North
 
$
1,424

 
$
944