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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2019
Property, plant and equipment [abstract]  
Property, Plant and Equipment
16.
Property, Plant and Equipment
(CAD$ in millions)
 
Exploration
and
Evaluation

 
Mineral
Properties

 
Land,
Buildings,
Plant and
Equipment

 
Capitalized
Production
Stripping
Costs

 
Construction
In Progress

 
Total

At December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
 
Cost
 
$
1,774

 
$
19,160

 
$
12,948

 
$
4,561

 
$
5,430

 
$
43,873

Accumulated depreciation
 
—

 
(5,359
)
 
(7,206
)
 
(2,263
)
 
—

 
(14,828
)
Net book value
 
$
1,774

 
$
13,801

 
$
5,742

 
$
2,298

 
$
5,430

 
$
29,045

Year ended December 31, 2018
 
 
 
 
 
 
 
 
 
 
 
 
Opening net book value
 
$
1,774

 
$
13,801

 
$
5,742

 
$
2,298

 
$
5,430

 
$
29,045

Additions
 
144

 
86

 
710

 
761

 
1,135

 
2,836

Disposals
 
—

 
—

 
(12
)
 
—

 
—

 
(12
)
Asset impairments (Note 8)
 
(31
)
 
(6
)
 
(4
)
 
—

 
—

 
(41
)
Depreciation and amortization
 
—

 
(372
)
 
(595
)
 
(543
)
 
—

 
(1,510
)
Transfers between classifications
 
—

 
1,050

 
3,307

 
—

 
(4,357
)
 
—

Decommissioning and restoration provision change in estimate
 
—

 
(250
)
 
(29
)
 
—

 
—

 
(279
)
Capitalized borrowing costs (Note 10)
 
—

 
108

 
—

 
—

 
185

 
293

Other
 
—

 
(2
)
 
56

 
—

 
—

 
54

Changes in foreign exchange rates
 
21

 
290

 
182

 
50

 
121

 
664

Closing net book value
 
$
1,908

 
$
14,705

 
$
9,357

 
$
2,566

 
$
2,514

 
$
31,050

At December 31, 2018
 
 
 
 
 
 
 
 
 
 
 
 
Cost
 
$
1,908

 
$
20,444

 
$
17,452

 
$
5,435

 
$
2,514

 
$
47,753

Accumulated depreciation
 
—

 
(5,739
)
 
(8,095
)
 
(2,869
)
 
—

 
(16,703
)
Net book value
 
$
1,908

 
$
14,705

 
$
9,357

 
$
2,566

 
$
2,514

 
$
31,050

Year ended December 31, 2019
 
 
 
 
 
 
 
 
 
 
 
 
Opening net book value
 
$
1,908

 
$
14,705

 
$
9,357

 
$
2,566

 
$
2,514

 
$
31,050

IFRS 16 adoption (Note 20 and Note 33)
 
—

 
—

 
280

 
—

 
—

 
280

Additions
 
119

 
—

 
201

 
757

 
3,076

 
4,153

Disposals
 
—

 
(2
)
 
(53
)
 
—

 
—

 
(55
)
Asset impairments (Note 8)
 
(1,129
)
 
(485
)
 
(1,008
)
 
(68
)
 
—

 
(2,690
)
Depreciation and amortization
 
—

 
(325
)
 
(774
)
 
(592
)
 
—

 
(1,691
)
Transfers between classifications
 
5

 
(112
)
 
418

 
13

 
(324
)
 
—

Decommissioning and restoration provision change in estimate
 
—

 
444

 
45

 
—

 
—

 
489

Capitalized borrowing costs (Note 10)
 
—

 
115

 
—

 
—

 
160

 
275

Changes in foreign exchange rates
 
(18
)
 
(158
)
 
(114
)
 
(32
)
 
(134
)
 
(456
)
Closing net book value
 
$
885

 
$
14,182

 
$
8,352

 
$
2,644

 
$
5,292

 
$
31,355

At December 31, 2019
 
 
 
 
 
 
 
 
 
 
 
 
Cost
 
$
885

 
$
20,155

 
$
16,951

 
$
6,073

 
$
5,292

 
$
49,356

Accumulated depreciation
 
—

 
(5,973
)
 
(8,599
)
 
(3,429
)
 
—

 
(18,001
)
Net book value
 
$
885

 
$
14,182

 
$
8,352

 
$
2,644

 
$
5,292

 
$
31,355


a)
Exploration and Evaluation

Significant exploration and evaluation projects in property, plant and equipment include Galore Creek and non-Fort Hills oil sands properties in Alberta.

b)
Borrowing Costs

Borrowing costs are capitalized at a rate based on our weighted average cost of borrowing or at the rate on the project-specific debt, as applicable. Capitalized borrowing costs are classified with the asset they relate to within mineral properties, land, buildings, plant and equipment, or construction in progress. Our weighted average borrowing rate used for capitalization of borrowing costs in 2019 was 5.9% (2018 – 5.9%).