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Segmented Information - Geographical information (Details) - CAD CAD in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of operating segments [line items] |  |
Operating revenues, net of royalties | CAD 32,051.0 | CAD 26,807.0
Non-current assets excluding deferred income tax assets | 79,817.0 | 77,620.0
Canada |  |
Disclosure of operating segments [line items] |  |
Operating revenues, net of royalties | 25,629.0 | 21,555.0
Non-current assets excluding deferred income tax assets | 76,091.0 | 73,704.0
United States |  |
Disclosure of operating segments [line items] |  |
Operating revenues, net of royalties | 4,252.0 | 3,695.0
Non-current assets excluding deferred income tax assets | 1,712.0 | 1,509.0
Other foreign |  |
Disclosure of operating segments [line items] |  |
Operating revenues, net of royalties | 2,170.0 | 1,557.0
Non-current assets excluding deferred income tax assets | CAD 2,014.0 | CAD 2,407.0

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