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Commitments - Additional Information (Detail) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2017 | Sep. 30, 2007 | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 CAD ($)
Disclosure of commitments [line items] |  |  |  |  |  |  |
Purchase commitment per year |  |  |  |  | $ 2,860,000,000 |  |
Expected period |  |  |  | 1 year | 1 year |  |
Royalty expense |  |  |  |  | $ 343,000,000 |  | $ 370,000,000
Less than one year |  |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |  |
Purchase commitment per year |  |  |  |  | 2,400,000,000 |  |
Within two to five years |  |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |  |
Purchase commitment per year |  |  |  |  | 460,000,000 |  |
Antamina |  |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |  |
Purchase commitment per year |  |  |  |  | $ 93,000,000 |  |
Ownership interest in joint operation | 22.50% |  |  | 22.50% | 22.50% |  |
Royalty percentage |  |  |  | 7.40% | 7.40% |  |
Royalty expense |  |  |  |  | $ 16,000,000 |  | 25,000,000
Steelmaking Coal Operations |  |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |  |
Purchase commitment per year |  |  |  |  | 224,000,000 |  |
QB2 |  |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |  |
Purchase commitment per year |  |  |  |  | $ 2,540,000,000 |  |
TAK |  |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |  |
Royalty percentage |  | 35.00% | 25.00% |  |  |  |
Increase in net proceeds of production royalty |  |  |  | 5.00% | 5.00% |  |
Maximum royalty percentage |  |  |  | 50.00% | 50.00% |  |
Royalty expense |  |  |  | $ 231 |  | $ 252 |
TML |  |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |  |
Purchase commitment per year |  |  |  |  |  |  | $ 75,000,000
Purchase period |  |  |  |  |  | 20 years | 20 years
Optional purchase period extension |  |  |  |  |  | 10 years | 10 years
Purchase commitment percentage increase per year |  |  |  |  |  | 2.00% | 2.00%

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- Definition The amount of capital commitments for which the entity has entered into a contract. [Refer: Capital commitments] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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