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Net Other Operating (Income) Loss - Narrative (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
CAD ($)
Dec. 31, 2022
CAD ($)
Dec. 31, 2021
CAD ($)
Dec. 31, 2021
USD ($)
Analysis of income and expenses [Line Items]        
Alberta Off-Coal Agreement $ (40) $ (40) $ (40)  
Annual cash payments, net 37      
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  
Sundance Unit 5        
Analysis of income and expenses [Line Items]        
Net deferred tax assets     $ 10 $ 8
Windrise Wind Facility        
Analysis of income and expenses [Line Items]        
Liquidated damages recoverable $ 3 $ 0