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Derivatives Instruments (Summary of Concentration Risk) (Details) - Credit Concentration Risk - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Concentration Risk [Line Items] |  |
Concentration Risk, maximum exposure | $ 1,300,000 | $ 1,200,000
Receivables, net | Classification as assets held for sale |  |
Concentration Risk [Line Items] |  |
Concentration Risk, maximum exposure | $ 118,000 | $ 0
% of total exposure | 7.00% | 0.00%
Receivables, net | Other accounts receivable |  |
Concentration Risk [Line Items] |  |
Concentration Risk, maximum exposure | $ 331,000 | $ 151,000
% of total exposure | 20.00% | 10.00%
Receivables, net | Trading group |  |
Concentration Risk [Line Items] |  |
Concentration Risk, maximum exposure | $ 295,000 | $ 188,000
% of total exposure | 17.00% | 12.00%
Receivables, net | Receivables |  |
Concentration Risk [Line Items] |  |
Concentration Risk, maximum exposure | $ 1,528,000 | $ 1,290,000
% of total exposure | 90.00% | 84.00%
Receivables, net | Credit rating of A- or above | Trading group |  |
Concentration Risk [Line Items] |  |
Concentration Risk, maximum exposure | $ 88,000 | $ 47,000
% of total exposure | 5.00% | 3.00%
Receivables, net | Credit rating of BBB- to BBB+ | Trading group |  |
Concentration Risk [Line Items] |  |
Concentration Risk, maximum exposure | $ 42,000 | $ 33,000
% of total exposure | 2.00% | 2.00%
Receivables, net | Not rated | Trading group |  |
Concentration Risk [Line Items] |  |
Concentration Risk, maximum exposure | $ 165,000 | $ 108,000
% of total exposure | 10.00% | 7.00%
Derivative Instruments (current and long-term) | Derivatives |  |
Concentration Risk [Line Items] |  |
Concentration Risk, maximum exposure | $ 166,000 | $ 240,000
% of total exposure | 10.00% | 16.00%
Derivative Instruments (current and long-term) | Receivables and Derivatives |  |
Concentration Risk [Line Items] |  |
Concentration Risk, maximum exposure | $ 1,694,000 | $ 1,530,000
% of total exposure | 100.00% | 100.00%
Derivative Instruments (current and long-term) | Credit rating of A- or above | Derivatives |  |
Concentration Risk [Line Items] |  |
Concentration Risk, maximum exposure | $ 91,000 | $ 138,000
% of total exposure | 5.00% | 9.00%
Derivative Instruments (current and long-term) | Credit rating of BBB- to BBB+ | Derivatives |  |
Concentration Risk [Line Items] |  |
Concentration Risk, maximum exposure | $ 1,000 | $ 7,000
% of total exposure | 0.00% | 1.00%
Derivative Instruments (current and long-term) | Not rated | Derivatives |  |
Concentration Risk [Line Items] |  |
Concentration Risk, maximum exposure | $ 74,000 | $ 95,000
% of total exposure | 5.00% | 6.00%
Regulated utilities | Receivables, net |  |
Concentration Risk [Line Items] |  |
Concentration Risk, maximum exposure | $ 784,000 | $ 951,000
% of total exposure | 46.00% | 62.00%
Regulated utilities | Receivables, net | Residential |  |
Concentration Risk [Line Items] |  |
Concentration Risk, maximum exposure | $ 376,000 | $ 476,000
% of total exposure | 22.00% | 31.00%
Regulated utilities | Receivables, net | Commercial |  |
Concentration Risk [Line Items] |  |
Concentration Risk, maximum exposure | $ 184,000 | $ 194,000
% of total exposure | 11.00% | 13.00%
Regulated utilities | Receivables, net | Industrial |  |
Concentration Risk [Line Items] |  |
Concentration Risk, maximum exposure | $ 73,000 | $ 84,000
% of total exposure | 4.00% | 5.00%
Regulated utilities | Receivables, net | Other |  |
Concentration Risk [Line Items] |  |
Concentration Risk, maximum exposure | $ 105,000 | $ 103,000
% of total exposure | 6.00% | 7.00%
Regulated utilities | Receivables, net | Cash Collateral |  |
Concentration Risk [Line Items] |  |
Concentration Risk, maximum exposure | $ 46,000 | $ 94,000
% of total exposure | 3.00% | 6.00%

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- Definition Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-21 + Details
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