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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
Jul. 20, 2018
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Analysis of income and expense [abstract]        
Alberta Off-Coal Agreement $ (40) $ (40) $ (40) $ (40)
Liquidated damages recoverable   (12) 0 0
Insurance recoveries   (7) 0 0
Supplier and other contract settlements   5 34 0
Onerous contract provisions   0 14 29
Retail power contract amortization   (4) 0 0
Net other operating (income) loss   $ (58) $ 8 $ (11)