Property, Plant and Equipment, Net - Summary of Property, Plant and Equipment (Parenthetical) (Detail) $ in Millions	Dec. 31, 2018 CAD ($)
FCCL [Member]
Disclosure Of Property Plant And Equipment [Line Items]
Carrying value of the pre-existing interest in FCCL	$ 8,602

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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