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other long-term assets - Summary (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
other long-term assets      
Pension assets $ 503 $ 156 $ 358
Costs incurred to obtain or fulfill a contract with a customer 110 107 93
Portfolio investments 70 41 62
Prepaid maintenance 55 57 62
Real estate joint venture advances 69 47 21
Real estate joint ventures 5 15 30
Derivative assets 54 6 6
Other 120 99 101
Total $ 986 $ 528 $ 733