Long-Term Debt (Detail) - CAD ($) $ in Millions		Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-term debt		$ 4,447	$ 4,447
Finance leases		522	514
Total long-term debt	[1]	$ 4,969	$ 4,961

[1] Long-term debt included amounts to related parties of $4,447 million (2019 - $4,447 million).