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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Supplementary Oil & Gas Information [Line Items] |  |  |
Crude oil and natural gas revenue, net of royalties, blending and feedstock costs | $ 30,057 | $ 16,893 | $ 22,871
Production | (7,152) | (6,280) | (6,277)
Transportation | (6,604) | (4,498) | (4,699)
Depletion, depreciation and amortization | (5,724) | (6,046) | (5,546)
Asset retirement obligation accretion | (185) | (205) | (190)
Income tax | (1,848) | 257 | (434)
Oil And Gas |  |  |
Supplementary Oil & Gas Information [Line Items] |  |  |
Crude oil and natural gas revenue, net of royalties, blending and feedstock costs | 24,160 | 13,306 | 18,944
Production | (6,851) | (6,048) | (6,201)
Transportation | (1,184) | (1,274) | (989)
Depletion, depreciation and amortization | (5,709) | (6,031) | (5,532)
Asset retirement obligation accretion | (185) | (205) | (190)
Petroleum revenue tax | 33 | 31 | 88
Income tax | (2,396) | 82 | (1,652)
Results of operations | 7,868 | (139) | 4,468
Oil And Gas | North America |  |  |
Supplementary Oil & Gas Information [Line Items] |  |  |
Crude oil and natural gas revenue, net of royalties, blending and feedstock costs | 23,111 | 12,520 | 17,348
Production | (6,377) | (5,624) | (5,701)
Transportation | (1,176) | (1,258) | (968)
Depletion, depreciation and amortization | (5,407) | (5,564) | (4,982)
Asset retirement obligation accretion | (158) | (169) | (156)
Petroleum revenue tax | 0 | 0 | 0
Income tax | (2,317) | 23 | (1,468)
Results of operations | 7,676 | (72) | 4,073
Oil And Gas | North Sea |  |  |
Supplementary Oil & Gas Information [Line Items] |  |  |
Crude oil and natural gas revenue, net of royalties, blending and feedstock costs | 611 | 432 | 920
Production | (383) | (321) | (391)
Transportation | (7) | (15) | (19)
Depletion, depreciation and amortization | (160) | (277) | (308)
Asset retirement obligation accretion | (21) | (30) | (28)
Petroleum revenue tax | 33 | 31 | 88
Income tax | (29) | 72 | (105)
Results of operations | 44 | (108) | 157
Oil And Gas | Offshore Africa |  |  |
Supplementary Oil & Gas Information [Line Items] |  |  |
Crude oil and natural gas revenue, net of royalties, blending and feedstock costs | 438 | 354 | 676
Production | (91) | (103) | (109)
Transportation | (1) | (1) | (2)
Depletion, depreciation and amortization | (142) | (190) | (242)
Asset retirement obligation accretion | (6) | (6) | (6)
Petroleum revenue tax | 0 | 0 | 0
Income tax | (50) | (13) | (79)
Results of operations | $ 148 | $ 41 | $ 238

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