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Supplementary Oil And Gas Information (Unaudited) - Capitalized Costs Related to Crude Oil and Natural Gas Activities (Details) - CAD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items] |  |  |
Capitalized costs, proved properties | $ 136,108 | $ 130,953 | $ 128,872
Capitalized costs, unproved properties | 2,250 | 2,436 | 2,579
Capitalized costs, gross | 138,358 | 133,389 | 131,451
Net capitalized costs | 68,253 | 67,784 | 70,203
Oil and gas assets |  |  |
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items] |  |  |
Less: accumulated depletion and depreciation | (70,105) | (65,605) | (61,248)
North America |  |  |
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items] |  |  |
Capitalized costs, proved properties | 124,690 | 119,707 | 117,643
Capitalized costs, unproved properties | 2,159 | 2,353 | 2,510
Capitalized costs, gross | 126,849 | 122,060 | 120,153
Net capitalized costs | 65,618 | 65,130 | 67,329
North America | Oil and gas assets |  |  |
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items] |  |  |
Less: accumulated depletion and depreciation | (61,231) | (56,930) | (52,824)
North Sea |  |  |
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items] |  |  |
Capitalized costs, proved properties | 7,438 | 7,283 | 7,296
Capitalized costs, unproved properties | 0 | 0 | 0
Capitalized costs, gross | 7,438 | 7,283 | 7,296
Net capitalized costs | 1,487 | 1,430 | 1,584
North Sea | Oil and gas assets |  |  |
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items] |  |  |
Less: accumulated depletion and depreciation | (5,951) | (5,853) | (5,712)
Offshore Africa |  |  |
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items] |  |  |
Capitalized costs, proved properties | 3,980 | 3,963 | 3,933
Capitalized costs, unproved properties | 91 | 83 | 69
Capitalized costs, gross | 4,071 | 4,046 | 4,002
Net capitalized costs | 1,148 | 1,224 | 1,290
Offshore Africa | Oil and gas assets |  |  |
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items] |  |  |
Less: accumulated depletion and depreciation | $ (2,923) | $ (2,822) | $ (2,712)

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