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Property, Plant and Equipment - Narrative (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2021 CAD ($) property | Dec. 31, 2020 CAD ($) | Dec. 31, 2019 CAD ($) | Dec. 17, 2021 CAD ($) | Oct. 06, 2020 CAD ($) | Jun. 27, 2019 CAD ($)
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |
Interest costs capitalized | $ 0 | $ 24,000,000 | $ 53,000,000 |  |  |
Weighted average capitalization rate |  | 3.50% | 4.00% |  |  |
British Columbia - Gas Producing Assets And Processing Infrastructure Segment |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |
Number of acquisitions | property | 2 |  |  |  |  |
Property, plant and equipment | $ 257,000,000 |  |  |  |  |
Exploration and evaluation assets | 13,000,000 |  |  |  |  |
Total purchase consideration | 131,000,000 |  |  |  |  |
Asset retirement obligations | 58,000,000 |  |  |  |  |
Non-current liabilities recognised as of acquisition date | 65,000,000 |  |  |  |  |
Deferred tax asset | 462,000,000 |  |  |  |  |
Gains on acquisitions of property, plant and equipment, pre-tax | 478,000,000 |  |  |  |  |
North America |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |
Asset retirement obligations |  |  | $ 20,000,000 |  |  |
Gains on acquisitions of property, plant and equipment, pre-tax |  |  | 0 |  |  |
Net cash paid for consideration for acquisition of exploration and evaluation assets |  |  | 80,000,000 |  |  |
Deferred tax liability |  |  | 0 |  |  |
Oil Sands Mining and Upgrading |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |
Project costs not subject to depletion and depreciation | 118,000,000 | $ 117,000,000 |  |  |  |
STORM Resources Ltd |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |
Less: cash consideration |  |  |  | $ 771,000,000 |  |
Pro forma revenue | 294,000,000 |  |  |  |  |
Pro forma net operating income | 205,000,000 |  |  |  |  |
Property, plant and equipment |  |  |  | 1,114,000,000 |  |
Exploration and evaluation assets |  |  |  | 13,000,000 |  |
Total purchase consideration | $ 771,000,000 |  |  |  |  |
Asset retirement obligations |  |  |  | 18,000,000 |  |
Non-current liabilities recognised as of acquisition date |  |  |  | 35,000,000 |  |
Deferred tax liability |  |  |  | $ 140,000,000 |  |
Devon |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  | $ 3,325,000,000
Exploration and evaluation assets |  |  | 91,000,000 |  |  | 91,000,000
Total purchase consideration |  |  | 3,412,000,000 |  |  | 3,412,000,000
Asset retirement obligations |  |  |  |  |  | 178,000,000
Revenue of acquiree since acquisition date |  |  | 1,540,000,000 |  |  |
Revenue net of blending, production, transportation, and feedstock expense |  |  | 590,000,000 |  |  |
Painted Pony Energy Ltd |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |
Less: cash consideration |  |  |  |  | $ 111,000,000 |
Property, plant and equipment |  |  |  |  | 750,000,000 |
Exploration and evaluation assets |  | 15,000,000 |  |  | 15,000,000 |
Total purchase consideration |  | $ 111,000,000 |  |  |  |
Asset retirement obligations |  |  |  |  | 13,000,000 |
Non-current liabilities recognised as of acquisition date |  |  |  |  | 442,000,000 |
Deferred tax asset |  |  |  |  | $ 211,000,000 |
Non-revolving term credit facility maturing June 2022 |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |
Maximum credit facility |  |  | $ 3,250,000,000 |  |  | $ 3,250,000,000

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