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Asset and Goodwill Impairment Testing (Tables) | 12 Months Ended
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Dec. 31, 2020
Impairment of Assets [Abstract] |
Summary of Pre-tax Impairment Reversal and (Asset Impairments) Recorded in Statement of Income | The following pre-tax asset impairments were recorded in the statement of income (loss): Asset Impairments
(CAD$ in millions) |  | 2020 |  | 2019
Fort Hills CGU |  | $ | 1,244 |  |  | $ | 1,241 |
Frontier oil sands project |  | — |  |  | 1,129 |
Steelmaking coal CGU |  | — |  |  | 289 |
Other |  | — |  |  | 31 |
Total |  | $ | 1,244 |  |  | $ | 2,690 |
Summary of Key Assumptions Used in Our Asset Impairment Reversal and Goodwill Impairment Analyses | The following are the key assumptions used in our impairment testing calculations for the years ended December 31, 2020 and 2019:
| 2020 |  | 2019
WCS heavy oil prices per barrel | Long-term real price in 2025 of US$46 |  | Long-term real price in 2024 of US$50
Steelmaking coal prices per tonne | Long-term real price in 2025 of US$150 |  | Long-term real price in 2024 of US$150
Copper prices per pound | Long-term real price in 2025 of US$3.00 |  | Long-term real price in 2024 of US$3.00
Post-tax real discount rates | 6%—8% |  | 5.4%—6.0%
Long-term foreign exchange rates | 1 U.S. to 1.30 Canadian dollars |  | 1 U.S. to 1.30 Canadian dollars

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- Definition The disclosure of information for an individual asset, including goodwill, or a cash-generating unit, for which an impairment loss has been recognised or reversed. [Refer: Goodwill; Impairment loss; Reversal of impairment loss; Cash-generating units [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2020-01-01 -Paragraph 130 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2020-en-r&anchor=para_130&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The disclosure of information for cash-generating units. [Refer: Cash-generating units [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2020-01-01 -Paragraph 134 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2020-en-r&anchor=para_134&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Impairment of Assets [Abstract] + References No definition available. + Details
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