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Components of Deferred Income Tax Liabilities and Assets (Detail) - CAD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Components Of Deferred Tax Assets And Liabilities [Line Items] |  |  |
Depreciation and amortization | $ 5,164 | $ 5,726 | $ 5,564
Successful drilling and land acquisitions | 750 | 856 | 762
Pension and benefits | (469) | (336) | (422)
Asset retirement obligation | (336) | (381) | (376)
Capitalized interest | 117 | 121 | 118
LIFO inventory valuation | (276) | (107) | (318)
Tax loss carryforwards | (141) | (658) | (936)
Other | (161) | (150) | (196)
Net deferred income tax liabilities | $ 4,648 | $ 5,071 | $ 4,196

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