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Other Assets - Narrative (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
CAD ($)
Dec. 31, 2022
CAD ($)
Jul. 30, 2015
USD ($)
Disclosure of joint operations [line items]      
TransAlta Energy Transition Bill     $ 55
Loans receivable $ 26 $ 37  
Kent Hills Wind L.P.      
Disclosure of joint operations [line items]      
Loans receivable $ 25    
Ownership interests 17.00%    
Interest 4.55%    
Repayments received $ 12 $ 18