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Discontinued operations - Cash Flows (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of analysis of single amount of discontinued operations [line items]
Cash from discontinued operations	$ 54	$ 94
Cash from (used in) discontinued operations	892	(18)
Cash used in discontinued operations	(7)	(6)
Net increase in cash	83	(284)
Discontinued operations
Disclosure of analysis of single amount of discontinued operations [line items]
Net increase in cash	$ 939	$ 70

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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
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-IssueDate 2020-01-01
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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]

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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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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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