XML 164 R130.htm IDEA: XBRL DOCUMENT
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Commitments - Additional Information (Detail) $ in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2007 | Dec. 31, 2018 CAD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2017 USD ($)
Disclosure of commitments [line items] |  |  |  |  |  |
Amount expected to be incurred |  |  | $ 724 |  |  |
Expected period |  |  | 1 year | 1 year |  |
Amount on lease rentals |  |  | $ 118 |  | $ 113 |
Royalty expense |  |  | 370 |  | 453 |
Within one year [member] |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |
Amount expected to be incurred |  |  | 638 |  |  |
Within two to five years [member] |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |
Amount expected to be incurred |  |  | 86 |  |  |
Office premises [member] |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |
Amount on lease rentals |  |  | 13 |  | 13 |
Mining equipment [member] |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |
Amount on lease rentals |  |  | 66 |  | 60 |
Rail facilities [member] |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |
Amount on lease rentals |  |  | 6 |  | 12 |
Road and port facilities [member] |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |
Amount on lease rentals |  |  | $ 33 |  | 28 |
Trail Operations [member] |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |
Purchase commitment per year |  |  |  | $ 75 |  |
Purchase commitment percentage increase per year |  |  | 2.00% | 2.00% |  |
QB2 [member] |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |
Amount expected to be incurred |  |  | $ 562 |  |  |
Steelmaking Coal Operations [member] |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |
Amount expected to be incurred |  |  | 113 |  |  |
Antamina [member] |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |
Amount expected to be incurred |  |  | $ 49 |  |  |
Ownership interest in joint operation |  |  | 22.50% | 22.50% |  |
Royalty percentage |  |  | 7.40% | 7.40% |  |
Royalty expense |  |  | $ 25 |  | $ 28 |
Red Dog Road and Port lease [member] | Over Next Four Years [member] |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |
Minimum annual user fee |  |  |  | $ 18 |  |
Red Dog Road and Port lease [member] | Over next eighteen years [member] |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |
Minimum annual user fee |  |  |  | 6 |  |
Red Dog Road and Port lease [member] | Over twenty two years [member] |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |
Total remaining user fee |  |  |  | $ 173 |  |
Red Dog Royalty [member] |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |
Royalty percentage | 35.00% | 25.00% | 35.00% | 35.00% |  |
Maximum net proceeds of production royalty |  |  | 50.00% | 50.00% |  |
Increase in net proceeds of production royalty |  |  | 5.00% | 5.00% |  |
Royalty expense |  |  |  | $ 252 |  | $ 324
Top of range [member] |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |
Capital expenditure commitments expected period |  |  | 5 years | 5 years |  |
Lease term |  |  | 17 years | 17 years |  |
Bottom of range [member] |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |
Capital expenditure commitments expected period |  |  | 2 years | 2 years |  |

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