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Property, Plant and Equipment - Summary of Property Plant and Equipment (Detail) - CAD ($) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017 | Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |
Opening net book value | $ 29,045 | $ 27,595 |  |  |  |
Cost |  |  | $ 47,753 | $ 43,873 |  | $ 41,973
Accumulated depreciation |  |  | (16,703) | (14,828) |  | 14,378
Net book value | 29,045 | 27,595 | 31,050 | 29,045 | $ 27,595 | 27,595
Additions | 2,836 | 2,933 |  |  |  |
Disposals | (12) | (67) |  |  |  |
Impairment reversal and (asset impairments) | (41) | 163 |  |  |  |
Depreciation and amortization | (1,510) | (1,574) |  |  |  |
Decommissioning and restoration provision change in estimate | (279) | 525 |  |  |  |
Capitalized borrowing costs | 293 | 333 |  |  |  |
Other | 54 |  |  |  |  |
Reclassification of Waneta Dam to assets held for sale and other |  | (354) |  |  |  |
Changes in foreign exchange rates | 664 | (509) |  |  |  |
Closing net book value | 31,050 | 29,045 |  |  |  |
Exploration and Evaluation [member] |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |
Opening net book value | 1,774 | 1,613 |  |  |  |
Cost |  |  | 1,908 | 1,774 |  | 1,613
Net book value | 1,774 | 1,613 | 1,908 | 1,774 |  | 1,613
Additions | 144 | 171 |  |  |  |
Impairment reversal and (asset impairments) | (31) |  |  |  |  |
Changes in foreign exchange rates | 21 | (10) |  |  |  |
Closing net book value | 1,908 | 1,774 |  |  |  |
Mineral Properties [member] |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |
Opening net book value | 13,970 | 13,562 |  |  |  |
Cost |  |  | 20,613 | 19,329 |  | 18,667
Accumulated depreciation |  |  | (5,739) | (5,359) |  | 5,105
Net book value | 13,970 | 13,562 | 14,874 | 13,970 |  | 13,562
Additions | 86 | 174 |  |  |  |
Impairment reversal and (asset impairments) | (6) | 207 |  |  |  |
Depreciation and amortization | (372) | (368) |  |  |  |
Transfers between classifications | 1,050 | (8) |  |  |  |
Decommissioning and restoration provision change in estimate | (250) | 501 |  |  |  |
Capitalized borrowing costs | 108 | 102 |  |  |  |
Other | (2) |  |  |  |  |
Reclassification of Waneta Dam to assets held for sale and other |  | 40 |  |  |  |
Changes in foreign exchange rates | 290 | (240) |  |  |  |
Closing net book value | 14,874 | 13,970 |  |  |  |
Land, buildings, plant and equipment [member] |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |
Opening net book value | 5,742 | 6,352 |  |  |  |
Cost |  |  | 17,452 | 12,948 |  | 13,517
Accumulated depreciation |  |  | (8,095) | (7,206) |  | 7,165
Net book value | 5,742 | 6,352 | 9,357 | 5,742 |  | 6,352
Additions | 710 | 562 |  |  |  |
Disposals | (12) | (67) |  |  |  |
Impairment reversal and (asset impairments) | (4) | (44) |  |  |  |
Depreciation and amortization | (595) | (640) |  |  |  |
Transfers between classifications | 3,307 | 104 |  |  |  |
Decommissioning and restoration provision change in estimate | (29) | 24 |  |  |  |
Other | 56 |  |  |  |  |
Reclassification of Waneta Dam to assets held for sale and other |  | (394) |  |  |  |
Changes in foreign exchange rates | 182 | (155) |  |  |  |
Closing net book value | 9,357 | 5,742 |  |  |  |
Capitalized Production Stripping Costs [member] |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |
Opening net book value | 2,298 | 2,161 |  |  |  |
Cost |  |  | 5,435 | 4,561 |  | 4,269
Accumulated depreciation |  |  | (2,869) | (2,263) |  | 2,108
Net book value | 2,298 | 2,161 | 2,566 | 2,298 |  | 2,161
Additions | 761 | 742 |  |  |  |
Depreciation and amortization | (543) | (566) |  |  |  |
Changes in foreign exchange rates | 50 | (39) |  |  |  |
Closing net book value | 2,566 | 2,298 |  |  |  |
Construction In Progress [member] |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |
Opening net book value | 5,261 | 3,907 |  |  |  |
Cost |  |  | 2,345 | 5,261 |  | 3,907
Net book value | 5,261 | 3,907 | $ 2,345 | $ 5,261 |  | $ 3,907
Additions | 1,135 | 1,284 |  |  |  |
Transfers between classifications | (4,357) | (96) |  |  |  |
Capitalized borrowing costs | 185 | 231 |  |  |  |
Changes in foreign exchange rates | 121 | (65) |  |  |  |
Closing net book value | $ 2,345 | $ 5,261 |  |  |  |

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- Definition The amount of interest and other costs that an entity incurs in connection with the borrowing of funds that are directly attributable to the acquisition, construction or production of a qualifying asset and which form part of the cost of that asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 23 -IssueDate 2018-01-01 -Paragraph 26 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=23&date=2018-03-01&anchor=para_26_a&doctype=Standard -URIDate 2018-03-16 + Details
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