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Transactions - SMM/SC Subscription (Detail) $ in Millions, $ in Millions | Mar. 29, 2019 CAD ($) tonnes | Mar. 29, 2019 USD ($) tonnes | Dec. 31, 2020 CAD ($) | Dec. 31, 2019 CAD ($) | Mar. 29, 2019 USD ($)
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Disclosure of significant transactions [line items] |  |  |  |  |
Finance fees paid |  | $ 6 |  |  |
Preferential Dividend |  |  |  |  |
Disclosure of significant transactions [line items] |  |  |  |  |
Financial liabilities, at fair value |  |  | $ 30 | $ 82 |
Preferential Dividend | Quebrada Blanca |  |  |  |  |
Disclosure of significant transactions [line items] |  |  |  |  |
Financial liabilities, at fair value | $ 118 |  |  |  |
SSM/SC | Quebrada Blanca |  |  |  |  |
Disclosure of significant transactions [line items] |  |  |  |  |
Percent of effective ownership acquired | 30.00% | 30.00% |  |  |
Contingent consideration | $ 900 | $ 673 |  |  |
Finance fees paid | 7 |  |  |  |
Equity issued | 797 | $ 600 |  |  |
Consideration transferred, acquisition-date fair value | $ 1,704 |  |  |  | $ 1,279
Contingent liabilities recognized as of acquisition date |  |  |  |  | $ 50
Contingent consideration liability, triggering event, amount of tonnes per day | tonnes | 154,000,000 | 154,000,000 |  |  |
Contingent consideration, additional capital expansion contribution, percent | 8.00% | 8.00% |  |  |
Teck Resources |  |  |  |  |
Disclosure of significant transactions [line items] |  |  |  |  |
Proportion of ownership interest in associate | 60.00% | 60.00% |  |  |
Empresa Nacional De Mineria |  |  |  |  |
Disclosure of significant transactions [line items] |  |  |  |  |
Proportion of ownership interest in associate | 10.00% | 10.00% |  |  |

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