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Asset and Goodwill Impairment Testing - Additional Information (Detail) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Oct. 31, 2018
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Percentage of discount rate applied to cash flow projections | 6.00% | 5.90% |
Steelmaking Coal Operations [member] |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Description of periods when cash flows expected to occur | For our steelmaking coal operations, the cash flows cover periods of 9 to 51 years, with a steady state thereafter until reserves and resources are exhausted. |  |
Quebrada Blanca [member] |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Description of periods when cash flows expected to occur | For Quebrada Blanca, the cash flow covers 31 years, with our estimate of cash flows thereafter until reserves and resources are exhausted. |  |
Steelmaking coal CGU [member] | Pretax [member] |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Impairment reversal |  | $ 207 |
Steelmaking coal CGU [member] | After tax [member] |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Impairment reversal |  | 131 |
Other [member] |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Impairment charge | $ 41 |  |
Other [member] | Capitalized exploration expenditures [member] |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Impairment charge | 31 |  |
Other [member] | Quebrada Blanca assets [member] |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Impairment charge | $ 10 | $ 44 |
Steelmaking Coal [member] |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Recoverable amount of steelmaking coal CGU exceeding its carrying value |  |  | $ 6,700
Decrease in price percentage |  |  | 15.00%
Mining operations and goodwill [member] |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Percentage of discount rate applied to cash flow projections | 6.00% | 5.90% |
Percentage of nominal post-tax discount rate | 8.10% | 8.00% |

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- Definition The amount by which a cash-generating unit's (group of units') recoverable amount exceeds its carrying amount. [Refer: Carrying amount [member]; Cash-generating units [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2018-01-01 -Paragraph 134 -Subparagraph f -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_134_f_i&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2018-01-01 -Paragraph 135 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_135_e_i&doctype=Standard -URIDate 2018-03-16 + Details
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