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share-based compensation - Employee share purchase plan (Details) - Employee share purchase plan - CAD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
share-based compensation
Dividend reinvestment in Common Shares		$ 37	$ 34
Purchase plan discount	0.00%			0.00%	0.00%

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- Definition

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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- Definition

The amount of dividends reinvested in common shares.

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- Definition

Discount rate from fair value on purchase date that participants pay for shares.

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