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Acquisitions - Summary of Transaction Costs (Details) - CAD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021
Business Combinations [Abstract]
Transaction Costs	$ 0	$ 65
Integration Related Costs	29	66
Severance Payments	16	171
Total transaction costs	$ 45	$ 302

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Business Combinations [Abstract]

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Integration-Related Costs For Transaction Recognized Separately From Acquisition Of Assets And Assumption Of Liabilities In Business Combination

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- Definition

Severance Costs Recognized Separately From Acquisition Of Assets And Assumption Of Liabilities In Business Combination

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- Definition

The amount of acquisition-related costs for transactions recognised separately from the acquisition of assets and the assumption of liabilities in business combinations. [Refer: Business combinations [member]]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The amounts recognised for transaction recognised separately from the acquisition of assets and the assumption of liabilities in business combinations. [Refer: Business combinations [member]]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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