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Asset Impairment Charges - Narrative (Details)
$ in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2022
CAD ($)
MW
Mar. 31, 2021
CAD ($)
Dec. 31, 2022
CAD ($)
asset
numberOfAssets
facility
MW
Dec. 31, 2021
CAD ($)
MW
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
USD ($)
Disclosure of impairment loss recognised or reversed [line items]            
Impairment charges     $ 0 $ 10    
Recoverable amounts $ 10,741   10,741 9,226    
Asset impairment charges     9 648 $ 84  
Estimated salvage value       33    
Reversal of impairment loss     $ 102 0    
Energy Transition            
Disclosure of impairment loss recognised or reversed [line items]            
Asset impairment charges       $ 191    
Discount rate, measurement input            
Disclosure of impairment loss recognised or reversed [line items]            
Discount rates       5.0    
Wind Facilities            
Disclosure of impairment loss recognised or reversed [line items]            
Impairment charges       $ 10    
Wind Facilities | Level III | Non-recurring fair value measurement | Investment property            
Disclosure of impairment loss recognised or reversed [line items]            
Recoverable amounts       65    
Kent Hills Wind L.P.            
Disclosure of impairment loss recognised or reversed [line items]            
Impairment charges       $ 2    
Capacity of facility (in megawatts) | MW 167   167 167    
Keephills Unit 1 | Energy Transition            
Disclosure of impairment loss recognised or reversed [line items]            
Asset impairment charges       $ 94    
Sundance Unit 4 | Energy Transition            
Disclosure of impairment loss recognised or reversed [line items]            
Asset impairment charges       56    
Kaybob Cogeneration Project | Corporate            
Disclosure of impairment loss recognised or reversed [line items]            
Impairment charges   $ 27        
Asset impairment charges     $ (2) 27 0  
Reversal of impairment loss $ 2          
Hydro            
Disclosure of impairment loss recognised or reversed [line items]            
Number of facilities | facility     4      
Number of assets | asset     2      
Asset impairment charges     $ 21 5 2  
Hydro | Hydro Facilities            
Disclosure of impairment loss recognised or reversed [line items]            
Number of assets | numberOfAssets     4      
Carrying value 88   $ 88      
Hydro | Hydro Facilities | Level III | Non-recurring fair value measurement            
Disclosure of impairment loss recognised or reversed [line items]            
Recoverable amounts 89   $ 89      
Wind            
Disclosure of impairment loss recognised or reversed [line items]            
Number of facilities | facility     5      
Solar            
Disclosure of impairment loss recognised or reversed [line items]            
Number of facilities | facility     1      
Wind and Solar            
Disclosure of impairment loss recognised or reversed [line items]            
Asset impairment charges     $ 43 12 0  
Wind and Solar | Wind and Solar Facilities            
Disclosure of impairment loss recognised or reversed [line items]            
Number of assets | asset     6      
Carrying value 748   $ 748      
Wind and Solar | Wind and Solar Facilities | Level III | Non-recurring fair value measurement            
Disclosure of impairment loss recognised or reversed [line items]            
Recoverable amounts $ 754   $ 754      
Mining assets | Highvale Mine            
Disclosure of impairment loss recognised or reversed [line items]            
Impairment charges       $ 195    
Property, plant and equipment | Sundance Unit 4            
Disclosure of impairment loss recognised or reversed [line items]            
Impairment charges         70  
Land            
Disclosure of impairment loss recognised or reversed [line items]            
Impairment loss         $ 9 $ 7