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SUPPLEMENTARY OIL & GAS INFORMATION (Unaudited) - Results of Operations from Crude Oil and Natural Gas Producing Activities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Supplementary Oil & Gas Information [Line Items]      
Crude oil and natural gas revenue, net of royalties, blending and feedstock costs $ 22,871 $ 21,027 $ 17,342
Production (6,277) (6,464) (5,675) [1]
Transportation (4,699) (4,189) (3,529) [1]
Depletion, depreciation and amortization (5,546) (5,161) (5,186)
Asset retirement obligation accretion (190) (186) (164)
Income tax (434) (374) 164
Oil And Gas      
Supplementary Oil & Gas Information [Line Items]      
Crude oil and natural gas revenue, net of royalties, blending and feedstock costs 18,944 17,603 14,445
Production (6,201) (6,385) (5,588)
Transportation (989) (953) (822)
Depletion, depreciation and amortization (5,532) (5,147) (5,177)
Asset retirement obligation accretion (190) (186) (164)
Petroleum revenue tax 88 12 78
Income tax (1,652) (1,350) (726)
Results of operations 4,468 3,594 2,046
Oil And Gas | North America      
Supplementary Oil & Gas Information [Line Items]      
Crude oil and natural gas revenue, net of royalties, blending and feedstock costs 17,348 16,065 13,083
Production (5,701) (5,772) (4,962)
Transportation (968) (929) (790)
Depletion, depreciation and amortization (4,982) (4,689) (4,463)
Asset retirement obligation accretion (156) (148) (128)
Petroleum revenue tax 0 0 0
Income tax (1,468) (1,223) (740)
Results of operations 4,073 3,304 2,000
Oil And Gas | North Sea      
Supplementary Oil & Gas Information [Line Items]      
Crude oil and natural gas revenue, net of royalties, blending and feedstock costs 920 891 784
Production (391) (405) (400)
Transportation (19) (22) (31)
Depletion, depreciation and amortization (308) (257) (509)
Asset retirement obligation accretion (28) (29) (27)
Petroleum revenue tax 88 12 78
Income tax (105) (76) 42
Results of operations 157 114 (63)
Oil And Gas | Offshore Africa      
Supplementary Oil & Gas Information [Line Items]      
Crude oil and natural gas revenue, net of royalties, blending and feedstock costs 676 647 578
Production (109) (208) (226)
Transportation (2) (2) (1)
Depletion, depreciation and amortization (242) (201) (205)
Asset retirement obligation accretion (6) (9) (9)
Petroleum revenue tax 0 0 0
Income tax (79) (51) (28)
Results of operations $ 238 $ 176 $ 109
[1] In connection with adoption of IFRS 15 on January 1, 2018, the Company has reclassified certain comparative amounts in a manner consistent with the presentation adopted for the year ended December 31, 2018.