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Asset and Goodwill Impairment Testing (Tables) | 12 Months Ended
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Dec. 31, 2019
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: Asset Impairments
(CAD$ in millions) |  | 2019 |  |  | 2018 |
Fort Hills CGU |  | $ | (1,241 | ) |  | $ | — |
Frontier oil sands project |  | (1,129 | ) |  | — |
Steelmaking coal CGU |  | (289 | ) |  | — |
Other |  | (31 | ) |  | (41 | )
Total |  | $ | (2,690 | ) |  | $ | (41 | )
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 during the years ended December 31, 2019 and 2018:
| 2019 |  |  | 2018 |
WCS heavy oil prices | Current price used in initial year, increased to a real long-term price in 2024 of US$50 per barrel |  |  | N/A |
Steelmaking coal prices | Current price used in initial year, increased to a real long-term price in 2024 of US$150 per tonne |  |  | Current price used in initial year, decreased to a real long-term price in 2023 of US$150 per tonne |
Copper prices | Current price used in initial year, increased to a real long-term price in 2024 of US$3.00 per pound |  |  | Current price used in initial year, increased to a real long-term price in 2023 of US$3.00 per pound |
Discount rate | 5.4%—6.0% |  |  | 6.0 | %
Long-term foreign exchange rate | 1 U.S. to 1.30 Canadian dollars |  |  | 1 U.S. to 1.25 Canadian dollars |
Inflation rate | 2 | % |  | 2 | %

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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 2019-01-01 -Paragraph 130 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2019-en-r&anchor=para_130&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 134 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2019-en-r&anchor=para_134&doctype=Standard -URIDate 2019-03-27 + Details
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