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Discontinued operations - Cash Flows (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disclosure of analysis of single amount of discontinued operations [line items]
Cash flows from operating activities	$ 0	$ 54
Cash flows from investing activities	0	892
Cash flows used in financing activities	0	(7)
Net increase in cash	$ (17)	83
Discontinued operations
Disclosure of analysis of single amount of discontinued operations [line items]
Net increase in cash		$ 939

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- Definition

Increase (Decrease) In Cash

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- Definition

The cash flows from (used in) the entity's financing activities, related to discontinued operations. [Refer: Discontinued operations [member]; Cash flows from (used in) financing activities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 5
-IssueDate 2021-01-01
-Paragraph 33
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- Definition

The cash flows from (used in) the entity's investing activities, related to discontinued operations. [Refer: Discontinued operations [member]; Cash flows from (used in) investing activities]

+ References

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-Name IFRS
-Number 5
-IssueDate 2021-01-01
-Paragraph 33
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- Definition

The cash flows from (used in) the entity's operating activities, related to discontinued operations. [Refer: Discontinued operations [member]; Cash flows from (used in) operating activities]

+ References

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