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Net Other Operating (Income) Loss - Disclosure of Components of Net Other Operating (Income) Expense (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Analysis of income and expense [abstract]      
Alberta Off-Coal Agreement $ (40) $ (40) $ (40)
Liquidated damages recoverable (6) (12) 0
Insurance recoveries (1) (7) 0
Supplier, other contract settlements and other 0 1 34
Onerous contract provisions 0 0 14
Net other operating (income) loss $ (47) $ (58) $ 8