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Related Party Transactions - Disclosure of Transactions with Associates (Details) - Associates - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of transactions between related parties [line items]      
Power sales $ 135 $ 127 $ 27
Purchased power 2 12 3
Asset management fees paid $ 1 $ 2 $ 2