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Derivatives Instruments (Summary of Concentration Risk) (Details) - Credit Concentration Risk - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Concentration Risk [Line Items]
Concentration Risk, maximum exposure	$ 1,200,000	$ 1,900,000
Receivables, net | Other accounts receivable
Concentration Risk [Line Items]
Concentration Risk, maximum exposure	$ 151,000	$ 585,000
% of total exposure	10.00%	25.00%
Receivables, net | Trading group
Concentration Risk [Line Items]
Concentration Risk, maximum exposure	$ 188,000	$ 507,000
% of total exposure	12.00%	21.00%
Receivables, net | Receivables
Concentration Risk [Line Items]
Concentration Risk, maximum exposure	$ 1,290,000	$ 1,982,000
% of total exposure	84.00%	83.00%
Receivables, net | Credit rating of A- or above | Trading group
Concentration Risk [Line Items]
Concentration Risk, maximum exposure	$ 47,000	$ 125,000
% of total exposure	3.00%	5.00%
Receivables, net | Credit rating of BBB- to BBB+ | Trading group
Concentration Risk [Line Items]
Concentration Risk, maximum exposure	$ 33,000	$ 75,000
% of total exposure	2.00%	3.00%
Receivables, net | Not rated | Trading group
Concentration Risk [Line Items]
Concentration Risk, maximum exposure	$ 108,000	$ 307,000
% of total exposure	7.00%	13.00%
Derivative Instruments (current and long-term) | Derivatives
Concentration Risk [Line Items]
Concentration Risk, maximum exposure	$ 240,000	$ 396,000
% of total exposure	16.00%	17.00%
Derivative Instruments (current and long-term) | Receivables and Derivatives
Concentration Risk [Line Items]
Concentration Risk, maximum exposure	$ 1,530,000	$ 2,378,000
% 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	$ 138,000	$ 202,000
% of total exposure	9.00%	9.00%
Derivative Instruments (current and long-term) | Credit rating of BBB- to BBB+ | Derivatives
Concentration Risk [Line Items]
Concentration Risk, maximum exposure	$ 7,000	$ 8,000
% of total exposure	1.00%	0.00%
Derivative Instruments (current and long-term) | Not rated | Derivatives
Concentration Risk [Line Items]
Concentration Risk, maximum exposure	$ 95,000	$ 186,000
% of total exposure	6.00%	8.00%
Regulated utilities | Receivables, net
Concentration Risk [Line Items]
Concentration Risk, maximum exposure	$ 951,000	$ 890,000
% of total exposure	62.00%	37.00%
Regulated utilities | Receivables, net | Residential
Concentration Risk [Line Items]
Concentration Risk, maximum exposure	$ 476,000	$ 455,000
% of total exposure	31.00%	19.00%
Regulated utilities | Receivables, net | Commercial
Concentration Risk [Line Items]
Concentration Risk, maximum exposure	$ 194,000	$ 192,000
% of total exposure	13.00%	8.00%
Regulated utilities | Receivables, net | Industrial
Concentration Risk [Line Items]
Concentration Risk, maximum exposure	$ 84,000	$ 121,000
% of total exposure	5.00%	5.00%
Regulated utilities | Receivables, net | Other
Concentration Risk [Line Items]
Concentration Risk, maximum exposure	$ 103,000	$ 122,000
% of total exposure	7.00%	5.00%
Regulated utilities | Receivables, net | Cash Collateral
Concentration Risk [Line Items]
Concentration Risk, maximum exposure	$ 94,000	$ 0
% of total exposure	6.00%	0.00%

X

- 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.

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