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Goodwill (Details) - CAD ($)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Goodwill [Roll Forward]    
Balance, beginning of year $ 12,184,000,000 $ 12,464,000,000
Disposition of Aitken Creek (Note 21) 0 (27,000,000)
Foreign currency translation impacts 928,000,000 (253,000,000)
Balance, end of year 13,112,000,000 12,184,000,000
Goodwill impairment loss $ 0 $ 0