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Income Taxes - Narrative (Details) - CAD ($) $ in Millions	Sep. 30, 2021	Jan. 01, 2021	Dec. 31, 2020
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred Income Taxes	$ 93		$ 36
Subsidiary Issuer
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred Income Taxes		$ 942
Canada
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred Income Taxes		862
United States
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred Income Taxes		58
Asia Pacific
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred Income Taxes		$ 22

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No definition available.

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- Definition

The amount of deferred tax assets net of deferred tax liabilities, when the absolute amount of deferred tax assets is greater than the absolute amount of deferred tax liabilities. [Refer: Deferred tax assets; Deferred tax liabilities]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 12
-IssueDate 2021-01-01
-Paragraph 81
-Subparagraph g
-Clause i
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-URIDate 2021-03-24

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