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Income Taxes (Net Operating Loss ("NOL"), Capital Loss and Tax Credit Carryforwards and Their Expiration Periods) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 CAD ($)
Canada | Capital loss
Composition of taxes on income from continuing operations [Line items]
Gross Tax Carryforwards	$ 73
Subject to Valuation Allowance	(73)
Net Tax Credit Carryforwards	$ 0
Expiration period	Indefinite
Canada | NOL
Composition of taxes on income from continuing operations [Line items]
Gross Tax Carryforwards	$ 2,914
Subject to Valuation Allowance	(1,164)
Net Tax Credit Carryforwards	$ 1,750
Expiration period	2026 - 2043
United States | NOL
Composition of taxes on income from continuing operations [Line items]
Gross Tax Carryforwards	$ 1,360
Subject to Valuation Allowance	(1)
Net Tax Credit Carryforwards	$ 1,359
Expiration period	2036 - Indefinite
United States | Tax credit
Composition of taxes on income from continuing operations [Line items]
Gross Tax Carryforwards	$ 454
Subject to Valuation Allowance	(3)
Net Tax Credit Carryforwards	$ 451
Expiration period	2025 - 2043
State | NOL
Composition of taxes on income from continuing operations [Line items]
Gross Tax Carryforwards	$ 1,003
Subject to Valuation Allowance	(1)
Net Tax Credit Carryforwards	$ 1,002
Expiration period	2026 - Indefinite
Other | NOL
Composition of taxes on income from continuing operations [Line items]
Gross Tax Carryforwards	$ 81
Subject to Valuation Allowance	(28)
Net Tax Credit Carryforwards	$ 53
Expiration period	2024 - 2030

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- Definition

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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

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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Amount of valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from tax credit carryforwards for which it is more likely than not that a tax benefit will not be realized.

+ References

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-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-2

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