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Equity-accounted investees (Narrative) (Details) - CAD ($)
12 Months Ended
Nov. 07, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2014
JV Inkai [Member]        
Disclosure of significant investments in associates [Line Items]        
Ownership interest in associates   40.00% 40.00%  
Non-ownership interest in associate   60.00%    
Percent of joint venture results   100.00%    
Westinghouse Electric Company [Member]        
Disclosure of significant investments in associates [Line Items]        
Ownership stake 49.00% 49.00%    
Percent of optional ownership interest 100.00% 100.00%    
Westinghouse Electric Company [Member] | Brookfield Renewable Partners [Member]        
Disclosure of significant investments in associates [Line Items]        
Ownership stake 51.00%      
Global Laser Enrichment LLC [Member]        
Disclosure of significant investments in associates [Line Items]        
Ownership interest in associates   49.00%    
Percent of optional ownership interest   75.00%    
Impairment loss       $ 183,615,000