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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
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Dec. 31, 2024 CAD ($)
Canada | Capital loss |
Composition of taxes on income from continuing operations [Line items] |
Gross Tax Carryforwards | $ 55
Subject to Valuation Allowance | (55)
Net Tax Credit Carryforwards | $ 0
Expiration period | Indefinite
Canada | NOL |
Composition of taxes on income from continuing operations [Line items] |
Gross Tax Carryforwards | $ 2,420
Subject to Valuation Allowance | (967)
Net Tax Credit Carryforwards | $ 1,453
Expiration period | 2026 - 2044
Canada | Tax credit |
Composition of taxes on income from continuing operations [Line items] |
Gross Tax Carryforwards | $ 2
Subject to Valuation Allowance | (1)
Net Tax Credit Carryforwards | $ 1
Expiration period | 2028 - 2042
United States | NOL |
Composition of taxes on income from continuing operations [Line items] |
Gross Tax Carryforwards | $ 1,587
Subject to Valuation Allowance | (1)
Net Tax Credit Carryforwards | $ 1,586
Expiration period | 2036 - Indefinite
United States | Tax credit |
Composition of taxes on income from continuing operations [Line items] |
Gross Tax Carryforwards | $ 533
Subject to Valuation Allowance | (3)
Net Tax Credit Carryforwards | $ 530
Expiration period | 2025 - 2044
State | NOL |
Composition of taxes on income from continuing operations [Line items] |
Gross Tax Carryforwards | $ 1,351
Subject to Valuation Allowance | (1)
Net Tax Credit Carryforwards | $ 1,350
Expiration period | 2026 - Indefinite
Other | NOL |
Composition of taxes on income from continuing operations [Line items] |
Gross Tax Carryforwards | $ 91
Subject to Valuation Allowance | (23)
Net Tax Credit Carryforwards | $ 68
Expiration period | 2025 - 2031

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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://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-3 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-3 + Details
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