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Other Long-Term Liabilities (Details) - CAD
CAD in Millions
Dec. 31, 2017
Dec. 31, 2016
Other Liabilities Disclosure [Abstract]    
Provision for environmental remediation, net of current portion CAD 70 CAD 76
Stock-based compensation liabilities, net of current portion 67 72
Deferred revenue on rights-of-way license agreements, net of current portion 26 29
Deferred retirement compensation 4 29
Deferred gains on sale leaseback transactions 16 19
Other, net of current portion 48 59
Total other long-term liabilities 231 284
Aggregate provision for environmental remediation, including current portion CAD 78 CAD 85