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Segmented Information - Geographical information (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of operating segments [line items] |  |
Operating revenues, net of royalties | $ 38,542.0 | $ 31,954.0
Non-current assets excluding deferred income tax assets | 80,751.0 | 79,817.0
Canada |  |
Disclosure of operating segments [line items] |  |
Operating revenues, net of royalties | 30,418.0 | 25,551.0
Non-current assets excluding deferred income tax assets | 76,708.0 | 76,091.0
United States |  |
Disclosure of operating segments [line items] |  |
Operating revenues, net of royalties | 5,999.0 | 4,252.0
Non-current assets excluding deferred income tax assets | 1,889.0 | 1,712.0
Other foreign |  |
Disclosure of operating segments [line items] |  |
Operating revenues, net of royalties | 2,125.0 | 2,151.0
Non-current assets excluding deferred income tax assets | $ 2,154.0 | $ 2,014.0

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