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Asset Impairment Charges (Reversals) - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
CAD ($)
Dec. 31, 2023
CAD ($)
asset
facility
Dec. 31, 2022
CAD ($)
facility
asset
Disclosure of impairment loss recognised or reversed [line items]      
Asset impairment charges (reversals) $ 46 $ (48) $ 9
Assets 9,499 8,659  
Reversal of impairment loss 17 $ 21  
Wind Facilities      
Disclosure of impairment loss recognised or reversed [line items]      
Number of assets | asset   2  
Impairment charges   $ 13  
Hydro      
Disclosure of impairment loss recognised or reversed [line items]      
Number of facilities | facility   2 4
Asset impairment charges (reversals) 0 $ (10) $ 21
Hydro | Hydro Facilities      
Disclosure of impairment loss recognised or reversed [line items]      
Number of assets | asset     4
Hydro | Level III | Non-recurring fair value measurement | Hydro Facilities      
Disclosure of impairment loss recognised or reversed [line items]      
Assets   70 $ 89
Wind and Solar      
Disclosure of impairment loss recognised or reversed [line items]      
Asset impairment charges (reversals) $ 0 $ (4) $ 43
Wind and Solar | Wind and Solar Facilities      
Disclosure of impairment loss recognised or reversed [line items]      
Number of assets | asset     6
Wind and Solar | Wind Facilities      
Disclosure of impairment loss recognised or reversed [line items]      
Number of facilities | facility   3  
Wind and Solar | Level III | Non-recurring fair value measurement | Wind and Solar Facilities      
Disclosure of impairment loss recognised or reversed [line items]      
Assets   $ 540 $ 754
Reversal of impairment loss   17  
Wind and Solar | Level III | Non-recurring fair value measurement | Wind Facilities      
Disclosure of impairment loss recognised or reversed [line items]      
Assets   $ 130  
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