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Income Taxes - Deferred Income Tax Assets and Liabilities (Details) - CAD
CAD in Millions
Dec. 31, 2017
Dec. 31, 2016
Deferred income tax assets    
Amount related to tax losses carried forward CAD 12 CAD 18
Liabilities carrying value in excess of tax basis 88 149
Environmental remediation costs 16 30
Other 11 58
Total deferred income tax assets 127 255
Deferred income tax liabilities    
Properties carrying value in excess of tax basis 3,181 3,796
Pensions carrying value in excess of tax basis 226 0
Other 41 30
Total deferred income tax liabilities 3,448 3,826
Total net deferred income tax liabilities CAD 3,321 CAD 3,571