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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