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Revenues - Summary of Revenue Disaggregated by Major Product Type and by Business Unit (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2019
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CAD ($)
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue $ 11,934   $ 12,564
Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 12,453   13,214
Intra-segment      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 519   650
Steelmaking Coal      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 5,522   6,349
Steelmaking Coal | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 5,522   6,349
Steelmaking Coal | Intra-segment      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0   0
Copper      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 2,469   2,714
Copper | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 2,469   2,714
Copper | Intra-segment      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0   0
Zinc      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 2,968   3,094
Zinc | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 3,487   3,744
Zinc | Intra-segment      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 519   650
Energy      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 975   407
Energy | Intra-segment      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0   0
Steelmaking coal | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 5,522   6,349
Steelmaking coal | Steelmaking Coal | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 5,522   6,349
Steelmaking coal | Copper | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0   0
Steelmaking coal | Zinc | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0   0
Steelmaking coal | Energy | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0   0
Copper | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 2,158   2,242
Copper | Steelmaking Coal | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0   0
Copper | Copper | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 2,158   2,242
Copper | Zinc | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0   0
Copper | Energy | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0   0
Zinc | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 2,529   2,980
Zinc | Steelmaking Coal | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0   0
Zinc | Copper | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 163   279
Zinc | Zinc | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 2,366 $ 2,701  
Zinc | Energy | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0   0
Blended bitumen | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 975   407
Blended bitumen | Steelmaking Coal | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0   0
Blended bitumen | Copper | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0   0
Blended bitumen | Zinc | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0 $ 0  
Blended bitumen | Energy | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 975   407
Silver | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 400   324
Silver | Steelmaking Coal | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0   0
Silver | Copper | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 24   18
Silver | Zinc | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 376   306
Silver | Energy | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0   0
Lead | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 400   419
Lead | Steelmaking Coal | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0   0
Lead | Copper | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 5   0
Lead | Zinc | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 395   419
Lead | Energy | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0   0
Other | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 469   493
Other | Steelmaking Coal | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0   0
Other | Copper | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 119   175
Other | Zinc | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 350   318
Other | Energy | Segment revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue $ 0   $ 0