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Income Taxes - Tax Carryforward (Details) $ in Millions	Dec. 31, 2023 CAD ($)
Tax Credit Carryforward [Line Items]
Total income tax carryforwards recognized	$ 600
Canadian
Tax Credit Carryforward [Line Items]
Total income tax carryforwards recognized
Foreign
Tax Credit Carryforward [Line Items]
Federal and state net operating loss	345
Tax carryforward, gross	470
Non-capital loss | Canadian
Tax Credit Carryforward [Line Items]
Tax credit carryforward	130
Other tax credits | Foreign
Tax Credit Carryforward [Line Items]
Tax credit carryforward	$ 125

X

- Definition

Tax Carryforward, Amount

+ References

No definition available.

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- Definition

Tax Carryforward, Net

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X

- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-3

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- Definition

The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

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-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-3

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