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Property, Plant and Equipment - Summary of Property Plant and Equipment (Detail) - CAD CAD in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening net book value | CAD 27,595 | CAD 26,791 |  |  |
Additions | 2,933 | 1,887 |  |  |
Disposals | (67) | (10) |  |  |
Impairment reversal and (asset impairments) (Note 6) | 163 | (294) |  |  |
Depreciation and amortization | (1,574) | (1,513) |  |  |
Decommissioning and restoration provision change in estimate | 525 | 659 |  |  |
Capitalized borrowing costs | 333 | 266 |  |  |
Reclass of Waneta Dam and other | (354) |  |  |  |
Other |  | (15) |  |  |
Changes in foreign exchange rates | (509) | (176) |  |  |
Closing net book value | 29,045 | 27,595 |  |  |
Cost |  |  | CAD 43,873 | CAD 41,973 | CAD 39,756
Accumulated depreciation |  |  | (14,828) | (14,378) | (12,965)
Net book value | 27,595 | 26,791 | 29,045 | 27,595 | 26,791
Exploration and Evaluation [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening net book value | 1,613 | 1,600 |  |  |
Additions | 171 | 24 |  |  |
Other |  | (9) |  |  |
Changes in foreign exchange rates | (10) | (2) |  |  |
Closing net book value | 1,774 | 1,613 |  |  |
Cost |  |  | 1,774 | 1,613 | 1,600
Net book value | 1,613 | 1,600 | 1,774 | 1,613 | 1,600
Mineral Properties [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening net book value | 13,562 | 13,225 |  |  |
Additions | 174 | 47 |  |  |
Impairment reversal and (asset impairments) (Note 6) | 207 |  |  |  |
Depreciation and amortization | (368) | (356) |  |  |
Transfers between classifications | (8) |  |  |  |
Decommissioning and restoration provision change in estimate | 501 | 633 |  |  |
Capitalized borrowing costs | 102 | 91 |  |  |
Reclass of Waneta Dam and other | 40 |  |  |  |
Changes in foreign exchange rates | (240) | (78) |  |  |
Closing net book value | 13,970 | 13,562 |  |  |
Cost |  |  | 19,329 | 18,667 | 18,001
Accumulated depreciation |  |  | (5,359) | (5,105) | (4,776)
Net book value | 13,562 | 13,225 | 13,970 | 13,562 | 13,225
Land, Buildings, Plant and Equipment [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening net book value | 6,352 | 6,634 |  |  |
Additions | 562 | 173 |  |  |
Disposals | (67) | (10) |  |  |
Impairment reversal and (asset impairments) (Note 6) | (44) |  |  |  |
Asset impairments (Note 6) |  | (26) |  |  |
Depreciation and amortization | (640) | (657) |  |  |
Transfers between classifications | 104 | 276 |  |  |
Decommissioning and restoration provision change in estimate | 24 | 26 |  |  |
Reclass of Waneta Dam and other | (394) |  |  |  |
Other |  | (6) |  |  |
Changes in foreign exchange rates | (155) | (58) |  |  |
Closing net book value | 5,742 | 6,352 |  |  |
Cost |  |  | 12,948 | 13,517 | 13,208
Accumulated depreciation |  |  | (7,206) | (7,165) | (6,574)
Net book value | 6,352 | 6,634 | 5,742 | 6,352 | 6,634
Capitalized Production Stripping Costs [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening net book value | 2,161 | 2,146 |  |  |
Additions | 742 | 531 |  |  |
Depreciation and amortization | (566) | (500) |  |  |
Changes in foreign exchange rates | (39) | (16) |  |  |
Closing net book value | 2,298 | 2,161 |  |  |
Cost |  |  | 4,561 | 4,269 | 3,761
Accumulated depreciation |  |  | (2,263) | (2,108) | (1,615)
Net book value | 2,161 | 2,146 | 2,298 | 2,161 | 2,146
Construction In Progress [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening net book value | 3,907 | 3,186 |  |  |
Additions | 1,284 | 1,112 |  |  |
Asset impairments (Note 6) |  | (268) |  |  |
Transfers between classifications | (96) | (276) |  |  |
Capitalized borrowing costs | 231 | 175 |  |  |
Changes in foreign exchange rates | (65) | (22) |  |  |
Closing net book value | 5,261 | 3,907 |  |  |
Cost |  |  | 5,261 | 3,907 | 3,186
Net book value | CAD 3,907 | CAD 3,186 | CAD 5,261 | CAD 3,907 | CAD 3,186

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