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Summary of Significant Accounting Policies - Income Taxes (Details) - CAD ($) $ in Billions	Dec. 31, 2024	Dec. 31, 2023
Accounting Policies [Abstract]
Undistributed earnings on foreign subsidiaries	$ 8.1	$ 6.3

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- References

No definition available.

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- Definition

Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 740
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482603/740-30-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 25
-Paragraph 3
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482620/740-10-25-3

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-Name Accounting Standards Codification
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-Paragraph 1
-Subparagraph (b)
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-Name Accounting Standards Codification
-Section 50
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-SubTopic 740
-Topic 944
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478822/944-740-50-1

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