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Net Other Operating Income - Narrative (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of attribution of expenses by nature to their function [line items]      
Annual cash payments, net $ 37    
Other income 9 $ 1 $ 6
Heartland Generation      
Disclosure of attribution of expenses by nature to their function [line items]      
Annual cash payments, net $ 44