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SUPPLEMENTAL CASH FLOW INFORMATION - Additions to property, plant and equipment, net (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash Flow Statement [Abstract]
Capital expenditures before proceeds on disposition	$ 2,312	$ 2,845
Proceeds on disposition	0	(38)
Capital expenditures	$ 2,312	$ 2,807

X

- Definition

The cash inflow from sales of property, plant and equipment, classified as investing activities. [Refer: Property, plant and equipment]

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- Definition

The cash outflow for the purchases of property, plant and equipment, classified as investing activities. [Refer: Property, plant and equipment]

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Cash Flow Statement [Abstract]

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Proceeds From Sales (Purchase Of) Property, Plant and Equipment, Classified As Investing Activities

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