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SUPPLEMENTARY OIL & GAS INFORMATION (Unaudited) - Capitalized Costs Related to Crude Oil and Natural Gas Activities (Details) - CAD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items] |  |  |
Capitalized costs, proved properties | $ 128,872 | $ 122,946 | $ 118,907
Capitalized costs, unproved properties | 2,579 | 2,637 | 2,632
Capitalized costs, gross | 131,451 | 125,583 | 121,539
Net capitalized costs | 70,203 | 66,783 | 67,388
Oil and gas assets |  |  |
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items] |  |  |
Less: accumulated depletion and depreciation | (61,248) | (58,800) | (54,151)
North America |  |  |
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items] |  |  |
Capitalized costs, proved properties | 117,643 | 110,154 | 106,900
Capitalized costs, unproved properties | 2,510 | 2,600 | 2,541
Capitalized costs, gross | 120,153 | 112,754 | 109,441
Net capitalized costs | 67,329 | 63,892 | 64,662
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 | (52,824) | (48,862) | (44,779)
North Sea |  |  |
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items] |  |  |
Capitalized costs, proved properties | 7,296 | 7,321 | 7,126
Capitalized costs, unproved properties | 0 | 0 | 0
Capitalized costs, gross | 7,296 | 7,321 | 7,126
Net capitalized costs | 1,584 | 1,586 | 1,473
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 | (5,712) | (5,735) | (5,653)
Offshore Africa |  |  |
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items] |  |  |
Capitalized costs, proved properties | 3,933 | 5,471 | 4,881
Capitalized costs, unproved properties | 69 | 37 | 91
Capitalized costs, gross | 4,002 | 5,508 | 4,972
Net capitalized costs | 1,290 | 1,305 | 1,253
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 | $ (2,712) | $ (4,203) | $ (3,719)

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