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Segments Disclosures - Depreciation and Amortization on the Consolidated Statements of Cash Flows (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of operating segments [abstract]      
Depreciation and amortization expense on the Consolidated Statements of Earnings (Loss) $ 621 $ 599 $ 529
Depreciation included in fuel and purchased power (Note 6) 0 0 190
Depreciation and amortization on the Consolidated Statements of Cash Flows $ 621 $ 599 $ 719