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Employee Future Benefits - Defined Contribution Plan (Narrative) (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items] |  |
Defined contribution plan cost recognized | $ 58 | $ 53
DBP Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Expected contributions for next fiscal year | 49 |
OPEB Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Expected contributions for next fiscal year | $ 12 |

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- Definition Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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