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financial instruments - Derivative gains and losses (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Currency risk
Disclosure of detailed information about financial instruments
Amount of gain (loss) recognized in other comprehensive income (effective portion)	$ (117)	$ (34)
Gain (loss) reclassified from other comprehensive income to income (effective portion)	3	(151)
Derivatives
Disclosure of detailed information about financial instruments
Amount of gain (loss) recognized in other comprehensive income (effective portion)	(123)	(24)
Gain (loss) reclassified from other comprehensive income to income (effective portion)	4	(139)
Derivatives | Currency risk
Disclosure of detailed information about financial instruments
Amount of gain (loss) recognized in other comprehensive income (effective portion)	(117)	(34)
Gain (loss) reclassified from other comprehensive income to income (effective portion)	3	(151)
Derivatives held for hedging | Currency risk related to purchases | U.S. Dollars | Goods and services purchased
Disclosure of detailed information about financial instruments
Amount of gain (loss) recognized in other comprehensive income (effective portion)	(6)	(16)
Gain (loss) reclassified from other comprehensive income to income (effective portion)	(9)	11
Derivatives held for hedging | Currency risk related to long-term debt | U.S. Dollars | Financing costs
Disclosure of detailed information about financial instruments
Amount of gain (loss) recognized in other comprehensive income (effective portion)	(44)	(21)
Gain (loss) reclassified from other comprehensive income to income (effective portion)	12	(162)
Spread included in fair value of derivative instruments	63	9
Derivatives held for hedging | Currency risk related to investment in a foreign operation | Financing costs
Disclosure of detailed information about financial instruments
Amount of gain (loss) recognized in other comprehensive income (effective portion)	(67)	3
Derivatives held for hedging | Currency risk related to investment in a foreign operation | U.S. Dollars | Financing costs
Disclosure of detailed information about financial instruments
Spread included in fair value of derivative instruments	4
Derivatives held for hedging | Other market risk | Employee benefits expense
Disclosure of detailed information about financial instruments
Amount of gain (loss) recognized in other comprehensive income (effective portion)	(6)	10
Gain (loss) reclassified from other comprehensive income to income (effective portion)	1	12
Derivatives held for trading | Currency risk | Financing costs
Disclosure of detailed information about financial instruments
Gain recognized in income on derivatives	11	(7)
Cash flow hedging item (HFH) | Derivatives held for hedging
Disclosure of detailed information about financial instruments
Ineffective portion of derivative instruments classified as cash flow hedging items	$ 0	$ 0

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The gain (loss) recognised in profit or loss on hedge ineffectiveness. [Refer: Gain (loss) on hedge ineffectiveness]

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The gains (losses) recognised in other comprehensive income on cash flow hedges, before tax. [Refer: Cash flow hedges [member]]

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