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Intangible Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about intangible assets [abstract]      
Project development costs $ 10 $ 29 $ 25
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance 256 313  
Change in foreign exchange rates 2    
Transfers (19) 0  
Ending balance 252 256  
Project development costs 10 29 $ 25
US Wind Projects      
Disclosure of detailed information about intangible assets [abstract]      
Project development costs 19    
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Project development costs 19    
Cost      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance 827 833  
Additions 31 9  
Impairment charges   (17)  
Change in foreign exchange rates 7 (2)  
Transfers 3 4  
Ending balance 868 827  
Accumulated amortization      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance (571) (520)  
Change in foreign exchange rates 2    
Amortization 43 51  
Ending balance (616) (571)  
Power sale contracts      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance 129 146  
Ending balance 114 129  
Power sale contracts | Cost      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance 269 269  
Additions 0 0  
Impairment charges   0  
Change in foreign exchange rates 3 0  
Transfers 0 0  
Ending balance 272 269  
Power sale contracts | Accumulated amortization      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance (140) (123)  
Change in foreign exchange rates 1    
Amortization 17 17  
Ending balance (158) (140)  
Software and other      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance 123 140  
Ending balance 111 123  
Software and other | Cost      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance 422 412  
Additions 0 0  
Impairment charges   0  
Change in foreign exchange rates 3 (2)  
Transfers 12 12  
Ending balance 437 422  
Software and other | Accumulated amortization      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance (299) (272)  
Change in foreign exchange rates 1    
Amortization 26 27  
Ending balance (326) (299)  
Intangibles under development      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance 4 3  
Ending balance 27 4  
Intangibles under development | Cost      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance 4 3  
Additions 31 9  
Impairment charges   0  
Change in foreign exchange rates 1 0  
Transfers (9) (8)  
Ending balance 27 4  
Intangibles under development | Accumulated amortization      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance 0 0  
Change in foreign exchange rates 0    
Amortization 0 0  
Ending balance 0 0  
Coal rights      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance 0 24  
Ending balance 0 0  
Coal rights | Cost      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance 132 149  
Additions 0 0  
Impairment charges   (17)  
Change in foreign exchange rates 0 0  
Transfers 0 0  
Ending balance 132 132  
Coal rights | Accumulated amortization      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance (132) (125)  
Change in foreign exchange rates 0    
Amortization 0 7  
Ending balance $ (132) $ (132)