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Goodwill (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Balance, January 1	$ 5,835	$ 6,313
Additions	0	3
GBPC impairment charge	0	(30)
Classified as assets held for sale	0	(148)
Change in foreign exchange rate	(115)	(303)
Balance, December 31	5,720	5,835
GBPC
Goodwill [Roll Forward]
Balance, January 1	70
GBPC impairment charge		(30)
Balance, December 31	$ 68	$ 70

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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