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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2019
Property, plant and equipment [abstract]  
Detailed information about property, plant and equipment
 
Exploration and Production
 
Oil Sands
 Mining and Upgrading

 
Midstream and Refining

 
Head
Office

 
Total

 
North
America

 
North Sea

 
Offshore
Africa

 
 
 
 
 
 
 
 
Cost
 
 
 
 
 
 
 
 
 
 
 
 
 
At December 31, 2017
$
64,816


$
7,126


$
4,881


$
42,084


$
428


$
414


$
119,749

Additions (1)
2,428


237


212


1,050


13


21


3,961

Transfers from E&E assets
175


—


—


222


—


—


397

Disposals/derecognitions and other
(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

Additions
2,613


349


233


2,154


10


34


5,393

Acquisition of Devon assets
3,325


—


—


—


—


—


3,325

Transfers from E&E assets
219


—


—


—


—


—


219

Disposals/derecognitions (2)
(537
)

—


(1,515
)

(285
)

—


(3
)

(2,340
)
Foreign exchange adjustments and other
—


(374
)

(256
)

—


—


—


(630
)
At December 31, 2019
$
72,627

 
$
7,296

 
$
3,933

 
$
45,016

 
$
451

 
$
466

 
$
129,789

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Accumulated depletion and depreciation
 
 

 
 

 
 

 
 

 
 

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

Expense
3,215


256


214


1,564


15


23


5,287

Disposals/derecognitions (2)
(537
)

—


(1,515
)

(285
)

—


(3
)

(2,340
)
Foreign exchange adjustments and other
18


(279
)

(190
)

(13
)

—


—


(464
)
At December 31, 2019
$
46,577

 
$
5,712

 
$
2,712

 
$
6,247

 
$
153

 
$
345

 
$
61,746

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net book value
 
 
 
 
 
 
 
 
 
 
 
 
 
 - at December 31, 2019
$
26,050

 
$
1,584

 
$
1,221

 
$
38,769

 
$
298

 
$
121

 
$
68,043

 - at December 31, 2018
$
23,126

 
$
1,586

 
$
1,268

 
$
38,166

 
$
303

 
$
110

 
$
64,559

(1)
Additions in North Sea during 2018 include a pre-tax revaluation gain of $19 million relating to acquisitions of its previously held interest.
(2)
Following demobilization of the FPSO at the Olowi field, Gabon in 2019, the Company derecognized property, plant and equipment and associated accumulated depletion and depreciation of $1,515 million.
Summary of net assets acquired and liabilities assumed
The following provides a summary of the net assets acquired relating to the acquisition:
Property, plant and equipment
$
3,325

Exploration and evaluation assets
91

Inventory, prepaids and other long-term assets
195

Accrued liabilities
(21
)
Asset retirement obligations
(178
)
Net assets acquired
$
3,412