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Segmented Information (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Mar. 23, 2018
Revenues and Other Income      
Less : Royalties $ (1,050.0) $ (931.0)  
Operating revenues, net of royalties 38,542.0 31,954.0  
Other income (loss) 444.0 125.0  
Total revenue 38,986.0 32,079.0  
Expenses      
Purchases of crude oil and products 14,133.0 11,121.0  
Operating, selling and general 10,573.0 9,188.0  
Transportation 1,319.0 997.0  
Depreciation, depletion, amortization and impairment 5,738.0 5,601.0  
Exploration 122.0 104.0  
(Gain) loss on asset exchange and disposal of assets (24.0) (602.0)  
Financing expenses (income) 2,142.0 (246.0)  
Total expenses 34,003.0 26,163.0  
Earnings before Income Taxes 4,983.0 5,916.0  
Income Tax Expense (Recovery)      
Current 1,250.0 1,209.0  
Deferred income tax expense (recovery) 440.0 249.0  
Total tax expense (income) 1,690.0 1,458.0  
Net Earnings (Loss) 3,293.0 4,458.0  
Capital and exploration expenditures 5,406.0 6,551.0  
Operating segments      
Revenues and Other Income      
Gross revenues 39,592.0 32,885.0  
Elimination of intersegment amounts      
Revenues and Other Income      
Gross revenues (3,773.0) (3,643.0)  
Corporate Energy Trading And Eliminations      
Revenues and Other Income      
Gross revenues 29.0 63.0  
Operating revenues, net of royalties (3,744.0) (3,580.0)  
Other income (loss) 206.0 (20.0)  
Total revenue (3,538.0) (3,600.0)  
Expenses      
Purchases of crude oil and products (4,086.0) (3,513.0)  
Operating, selling and general 521.0 559.0  
Transportation (47.0) (26.0)  
Depreciation, depletion, amortization and impairment 64.0 106.0  
(Gain) loss on asset exchange and disposal of assets   (97.0)  
Financing expenses (income) 1,769.0 (477.0)  
Total expenses (1,779.0) (3,448.0)  
Earnings before Income Taxes (1,759.0) (152.0)  
Income Tax Expense (Recovery)      
Current (400.0) (541.0)  
Deferred income tax expense (recovery) 162.0 330.0  
Total tax expense (income) (238.0) (211.0)  
Net Earnings (Loss) (1,521.0) 59.0  
Capital and exploration expenditures 58.0 34.0  
Oil Sands      
Revenues and Other Income      
Less : Royalties (398.0) (355.0)  
Operating revenues, net of royalties 15,345.0 12,919.0  
Other income (loss) 288.0 86.0  
Total revenue 15,633.0 13,005.0  
Expenses      
Purchases of crude oil and products 1,563.0 623.0  
Operating, selling and general 7,570.0 6,257.0  
Transportation 1,144.0 827.0  
Depreciation, depletion, amortization and impairment 4,024.0 3,782.0  
Exploration 44.0 15.0  
(Gain) loss on asset exchange and disposal of assets (108.0) (50.0)  
Financing expenses (income) 320.0 180.0  
Total expenses 14,557.0 11,634.0  
Earnings before Income Taxes 1,076.0 1,371.0  
Income Tax Expense (Recovery)      
Current (128.0) 192.0  
Deferred income tax expense (recovery) 351.0 170.0  
Total tax expense (income) 223.0 362.0  
Net Earnings (Loss) 853.0 1,009.0  
Capital and exploration expenditures 3,546.0 5,059.0  
Oil Sands | Operating segments      
Revenues and Other Income      
Gross revenues 12,039.0 9,723.0  
Oil Sands | Elimination of intersegment amounts      
Revenues and Other Income      
Gross revenues 3,704.0 3,551.0  
Exploration and Production      
Revenues and Other Income      
Less : Royalties (652.0) (576.0)  
Operating revenues, net of royalties 3,217.0 2,911.0  
Other income (loss) (71.0) (14.0)  
Total revenue 3,146.0 2,897.0  
Expenses      
Operating, selling and general 503.0 422.0  
Transportation 85.0 86.0  
Depreciation, depletion, amortization and impairment 967.0 1,028.0  
Exploration 78.0 89.0  
(Gain) loss on asset exchange and disposal of assets 91.0    
Financing expenses (income) 46.0 36.0  
Total expenses 1,770.0 1,661.0  
Earnings before Income Taxes 1,376.0 1,236.0  
Income Tax Expense (Recovery)      
Current 680.0 617.0  
Deferred income tax expense (recovery) (112.0) (113.0)  
Total tax expense (income) 568.0 504.0  
Net Earnings (Loss) 808.0 732.0  
Capital and exploration expenditures 946.0 824.0  
Exploration and Production | Operating segments      
Revenues and Other Income      
Gross revenues 3,869.0 3,487.0  
Refining and Marketing      
Revenues and Other Income      
Operating revenues, net of royalties 23,724.0 19,704.0  
Other income (loss) 21.0 73.0  
Total revenue 23,745.0 19,777.0  
Expenses      
Purchases of crude oil and products 16,656.0 14,011.0  
Operating, selling and general 1,979.0 1,950.0  
Transportation 137.0 110.0  
Depreciation, depletion, amortization and impairment 683.0 685.0  
(Gain) loss on asset exchange and disposal of assets (7.0) (455.0)  
Financing expenses (income) 7.0 15.0  
Total expenses 19,455.0 16,316.0  
Earnings before Income Taxes 4,290.0 3,461.0  
Income Tax Expense (Recovery)      
Current 1,098.0 941.0  
Deferred income tax expense (recovery) 39.0 (138.0)  
Total tax expense (income) 1,137.0 803.0  
Net Earnings (Loss) 3,153.0 2,658.0  
Capital and exploration expenditures 856.0 634.0  
Refining and Marketing | Operating segments      
Revenues and Other Income      
Gross revenues 23,655.0 19,612.0  
Refining and Marketing | Elimination of intersegment amounts      
Revenues and Other Income      
Gross revenues $ 69.0 $ 92.0  
Canbriam Energy, Inc.      
Disclosure of operating segments [line items]      
Interest purchased (as a percent)     37.00%