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Income Taxes - Additional Information (Detail) $ in Millions, $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2018 CAD ($) | Jan. 01, 2019 CAD ($) | Dec. 31, 2017 CAD ($)
Disclosure of Income Taxes [line items] |  |  |  |  |
Deferred income tax liabilities (Note 21) |  | $ 5,902 | $ 6,331 |  | $ 5,579
Unrecognized deferred tax assets |  | 293 | 300 |  |
Unrecognized deferred tax liabilities |  | 759 | 745 |  |
Unused tax losses |  | 2,560 | 2,910 |  |
Deferred tax recovery |  | 39 |  |  |
Adjustments for income tax expense |  | $ 120 | $ 1,365 |  |
IFRS 16 |  |  |  |  |
Disclosure of Income Taxes [line items] |  |  |  |  |
Deferred income tax liabilities (Note 21) |  |  |  | $ 20 |
Antamina |  |  |  |  |
Disclosure of Income Taxes [line items] |  |  |  |  |
Proportion of ownership interest in joint operation | 22.50% | 22.50% |  |  |
Adjustments for income tax expense | $ 2 |  |  |  |

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- Definition Adjustments for income tax expense to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 35 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amounts of income taxes payable in future periods in respect of taxable temporary differences. [Refer: Temporary differences [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2019-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph o -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_o&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 56 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_56&doctype=Standard -URIDate 2019-03-27 + Details
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