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Revenue (Remaining Performance Obligations) (Narrative) (Details) - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items] |  |
Revenue, Remaining Performance Obligation, Amount | $ 495 | $ 488
Revenue, Remaining Performance Obligation, Expected Timing Of Satisfaction (Year) | 2044 |
New Mexico Gas Company [Member] |  |
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items] |  |
Revenue, Remaining Performance Obligation, Amount | $ 3 |
SeaCoast Gas Transmission, LLC | PGS |  |
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items] |  |
Revenue, Remaining Performance Obligation, Amount | $ 135 |
Revenue, Remaining Performance Obligation, Expected Timing Of Satisfaction (Year) | 2040 |

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- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -SubTopic 10 -Topic 606 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-13 + Details
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- Definition Year in which remaining performance obligation is expected to be recognized, in YYYY format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b)(1) -SubTopic 10 -Topic 606 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-13 + Details
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