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Business Acquisitions - Heartland Generation (Details)
$ in Millions
 1 Months Ended 12 Months Ended
Dec. 31, 2024
CAD ($)
Dec. 31, 2024
CAD ($)
Dec. 04, 2024
CAD ($)
MW
Heartland Generation      
Disclosure of detailed information about business combination [line items]      
Total purchase consideration transferred     $ 574
Working capital adjustments     2
Cash and cash equivalents     276
Cash consideration     493
Contingent consideration payable     81
Goodwill arising on acquisition (Note 22)     $ 51
Transaction costs   $ 24  
Revenue of acquiree since acquisition date $ 34    
Net loss of acquiree since acquisition date $ (11)    
Revenue of combined entity as if combination occurred at beginning of period   598  
Profit (loss) of combined entity as if combination occurred at beginning of period   $ 66  
Heartland Generation | Cogeneration      
Disclosure of detailed information about business combination [line items]      
Capacity of facility (in megawatts) | MW     507
Heartland Generation | Contracted And Merchant Peaking Generation      
Disclosure of detailed information about business combination [line items]      
Capacity of facility (in megawatts) | MW     387
Heartland Generation | Natural Gas-Fired Thermal Generation      
Disclosure of detailed information about business combination [line items]      
Capacity of facility (in megawatts) | MW     950
Heartland Generation | Battle River Carbon Hub      
Disclosure of detailed information about business combination [line items]      
Capacity of facility (in megawatts) | MW     400
Heartland Generation | Poplar Hill and Rainbow Lake Assets      
Disclosure of detailed information about business combination [line items]      
Capacity of facility (in megawatts) | MW     97
Heartland Generation, Post Adjustments      
Disclosure of detailed information about business combination [line items]      
Total purchase consideration transferred     $ 542
Consideration reduction, amount     $ (95)