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Asset and Goodwill Impairment Testing (Tables) | 12 Months Ended
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Dec. 31, 2017
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Summary of Pre-tax Impairment Reversal and (Asset Impairments) Recorded in Statement of Profit and Loss | The following pre-tax impairment reversal and (asset impairments) were recorded in the statement of profit and loss: Impairment Reversal and (Asset Impairments)
(CAD$ in millions) |  | 2017 |  |  | 2016 |
Steelmaking coal CGU |  | $ | 207 |  |  | $ | — |
Fort Hills oil sands project |  |  | — |  |  |  | (222 | )
Other |  |  | (44 | ) |  |  | (72 | )
Total |  | $ | 163 |  |  | $ | (294 | )
Summary of Key Assumptions Used in Our Asset Impairment, Asset Impairment Reversal and Goodwill Impairment Analyses | The following are the key assumptions used in our asset impairment, asset impairment reversal and goodwill impairment analyses during the years ended December 31, 2017 and 2016:
|  | 2017 |  | 2016
Steelmaking coal prices |  | Current price used in initial year, decreased to a long-term price in 2022 of US$140 per tonne |  | Current price used in initial year, decreased to a long-term price in 2021 of US$130 per tonne
Copper prices |  | Current price used in initial year, decreased to a long-term price in 2022 of US$3.00 per pound |  | Current price used in initial year, increased to a long-term price in 2021 of US$3.00 per pound
Western Canadian Select (WCS) Oil prices |  | Current price used in initial year, increased to a long-term price in 2022 of US$57 per barrel |  | Current price used in initial year, increased to a long-term price in 2021 of US$57 per barrel
Discount rate |  | 5.2% — 5.9% |  | 5.5% — 6.0%
Long-term foreign exchange rate |  | 1 U.S. to 1.25 Canadian dollars |  | 1 U.S. to 1.25 Canadian dollars
Inflation rate |  | 2% |  | 2%

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- Definition The disclosure of impairment loss and the reversal of impairment loss. [Refer: Impairment loss; Reversal of impairment loss] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 126 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_126&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 134 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_134&doctype=Standard -URIDate 2017-03-09 + Details
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