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Asset Impairment Charges (Reversals) - Narrative (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2022
CAD ($)
Mar. 31, 2021
CAD ($)
Dec. 31, 2023
CAD ($)
facility
asset
MW
Dec. 31, 2022
CAD ($)
facility
asset
Dec. 31, 2021
CAD ($)
MW
Disclosure of impairment loss recognised or reversed [line items]          
Asset impairment charges (reversals)     $ (48) $ 9 $ 648
Recoverable amounts $ 10,741   8,659 10,741  
Estimated salvage value         33
Reversal of impairment loss     $ 21 $ 102  
Energy Transition          
Disclosure of impairment loss recognised or reversed [line items]          
Asset impairment charges (reversals)         191
Discount rate, measurement input          
Disclosure of impairment loss recognised or reversed [line items]          
Discount rates 5.0     5.0  
Wind Facilities          
Disclosure of impairment loss recognised or reversed [line items]          
Impairment charges       $ 13 10
Number of assets | asset     2    
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
Keephills Unit 1 | Energy Transition          
Disclosure of impairment loss recognised or reversed [line items]          
Asset impairment charges (reversals)         $ 94
Sundance Unit 4 | Energy Transition          
Disclosure of impairment loss recognised or reversed [line items]          
Asset impairment charges (reversals)         56
Kaybob Cogeneration Project | Corporate          
Disclosure of impairment loss recognised or reversed [line items]          
Asset impairment charges (reversals)     $ 0 (2) 27
Impairment charges   $ 27      
Reversal of impairment loss $ 2        
Hydro          
Disclosure of impairment loss recognised or reversed [line items]          
Asset impairment charges (reversals)     $ (10) $ 21 5
Number of facilities | facility     2 4  
Hydro | Hydro Facilities          
Disclosure of impairment loss recognised or reversed [line items]          
Number of assets | asset       4  
Hydro | Hydro Facilities | Level III | Non-recurring fair value measurement          
Disclosure of impairment loss recognised or reversed [line items]          
Recoverable amounts 89   $ 70 $ 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 (reversals)     $ (4) $ 43 12
Wind and Solar | Wind and Solar Facilities          
Disclosure of impairment loss recognised or reversed [line items]          
Number of assets | asset     3 6  
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   $ 540 $ 754  
Reversal of impairment loss     17    
Wind and Solar | Wind Facilities | Level III | Non-recurring fair value measurement          
Disclosure of impairment loss recognised or reversed [line items]          
Recoverable amounts     $ 130    
Mining assets | Highvale Mine          
Disclosure of impairment loss recognised or reversed [line items]          
Impairment charges         $ 195