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Segmented Information - Disaggregation of Revenue (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Gross revenues $ 39,592 $ 32,885
North America    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Gross revenues 37,467 30,734
International    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Gross revenues 2,125 2,151
Elimination of intersegment amounts    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Gross revenues (3,744) (3,580)
Elimination of intersegment amounts | North America    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Gross revenues (3,744) (3,580)
Oil Sands | Operating segments    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Gross revenues 15,743 13,274
Oil Sands | Operating segments | SCO And Diesel    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Gross revenues 11,659 11,244
Oil Sands | Operating segments | Bitumen    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Gross revenues 4,084 2,030
Oil Sands | Operating segments | North America    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Gross revenues 15,743 13,274
Oil Sands | Operating segments | North America | SCO And Diesel    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Gross revenues 11,659 11,244
Oil Sands | Operating segments | North America | Bitumen    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Gross revenues 4,084 2,030
Exploration and Production | Operating segments    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Gross revenues 3,869 3,487
Exploration and Production | Operating segments | Crude Oil And Natural Gas Liquids    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Gross revenues 3,853 3,459
Exploration and Production | Operating segments | Natural Gas    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Gross revenues 16 28
Exploration and Production | Operating segments | North America    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Gross revenues 1,744 1,336
Exploration and Production | Operating segments | North America | Crude Oil And Natural Gas Liquids    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Gross revenues 1,741 1,326
Exploration and Production | Operating segments | North America | Natural Gas    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Gross revenues 3 10
Exploration and Production | Operating segments | International    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Gross revenues 2,125 2,151
Exploration and Production | Operating segments | International | Crude Oil And Natural Gas Liquids    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Gross revenues 2,112 2,133
Exploration and Production | Operating segments | International | Natural Gas    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Gross revenues 13 18
Refining and Marketing | Operating segments    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Gross revenues 23,724 19,704
Refining and Marketing | Operating segments | Gasoline    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Gross revenues 10,819 9,075
Refining and Marketing | Operating segments | Distillate    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Gross revenues 9,698 7,800
Refining and Marketing | Operating segments | Other Product and Services    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Gross revenues 3,207 2,829
Refining and Marketing | Operating segments | North America    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Gross revenues 23,724 19,704
Refining and Marketing | Operating segments | North America | Gasoline    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Gross revenues 10,819 9,075
Refining and Marketing | Operating segments | North America | Distillate    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Gross revenues 9,698 7,800
Refining and Marketing | Operating segments | North America | Other Product and Services    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Gross revenues $ 3,207 $ 2,829