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Supplementary Oil And Gas Information (Unaudited) - Results of Operations from Crude Oil and Natural Gas Producing Activities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Supplementary Oil & Gas Information [Line Items]      
Crude oil and natural gas revenue, net of royalties, blending and feedstock costs $ 16,893 $ 22,871 $ 21,027
Production (6,280) (6,277) (6,464)
Transportation (4,498) (4,699) (4,189)
Depletion, depreciation and amortization (6,046) (5,546) (5,161)
Asset retirement obligation accretion (205) (190) (186)
Income tax 257 (434) (374)
Oil And Gas      
Supplementary Oil & Gas Information [Line Items]      
Crude oil and natural gas revenue, net of royalties, blending and feedstock costs 13,306 18,944 17,603
Production (6,048) (6,201) (6,385)
Transportation (1,274) (989) (953)
Depletion, depreciation and amortization (6,031) (5,532) (5,147)
Asset retirement obligation accretion (205) (190) (186)
Petroleum revenue tax 31 88 12
Income tax 82 (1,652) (1,350)
Results of operations (139) 4,468 3,594
Oil And Gas | North America      
Supplementary Oil & Gas Information [Line Items]      
Crude oil and natural gas revenue, net of royalties, blending and feedstock costs 12,520 17,348 16,065
Production (5,624) (5,701) (5,772)
Transportation (1,258) (968) (929)
Depletion, depreciation and amortization (5,564) (4,982) (4,689)
Asset retirement obligation accretion (169) (156) (148)
Petroleum revenue tax 0 0 0
Income tax 23 (1,468) (1,223)
Results of operations (72) 4,073 3,304
Oil And Gas | North Sea      
Supplementary Oil & Gas Information [Line Items]      
Crude oil and natural gas revenue, net of royalties, blending and feedstock costs 432 920 891
Production (321) (391) (405)
Transportation (15) (19) (22)
Depletion, depreciation and amortization (277) (308) (257)
Asset retirement obligation accretion (30) (28) (29)
Petroleum revenue tax 31 88 12
Income tax 72 (105) (76)
Results of operations (108) 157 114
Oil And Gas | Offshore Africa      
Supplementary Oil & Gas Information [Line Items]      
Crude oil and natural gas revenue, net of royalties, blending and feedstock costs 354 676 647
Production (103) (109) (208)
Transportation (1) (2) (2)
Depletion, depreciation and amortization (190) (242) (201)
Asset retirement obligation accretion (6) (6) (9)
Petroleum revenue tax 0 0 0
Income tax (13) (79) (51)
Results of operations $ 41 $ 238 $ 176