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Risk Management Activities - Maturity Analysis of Financial Liabilities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Bank overdraft $ 1 $ 3  
Accounts payable, accrued liabilities and other current liabilities 756 809  
Principal repayments 3,808 3,466  
Exchangeable securities 750    
Interest on debt 197 203 $ 164
Dividends payable 49 $ 49  
Cost      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Bank overdraft 1    
Accounts payable, accrued liabilities and other current liabilities 756    
Principal repayments 3,692    
Exchangeable securities 750    
Other risk management (assets) liabilities 4    
Lease liabilities 151    
Interest on debt 1,488    
Dividends payable 49    
Total 7,281    
Cost | Credit Facilities      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 545    
Cost | Debentures      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 251    
Cost | Senior notes      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 1,006    
Cost | Non-recourse – Hydro      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 39    
Cost | Non-recourse – Wind & Solar      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 570    
Cost | Non-recourse and other – Gas      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 952    
Cost | Tax equity financing      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 105    
Cost | Interest on exchangeable securities      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Interest on debt 223    
Cost | Non-Recourse Heartland term facility      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 224    
Cost | Commodity risk management (assets) liabilities(3)      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Commodity risk management (assets) liabilities(3) 167    
Cost | 2025      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Bank overdraft 1    
Accounts payable, accrued liabilities and other current liabilities 756    
Principal repayments 566    
Exchangeable securities 0    
Other risk management (assets) liabilities 11    
Lease liabilities 4    
Interest on debt 205    
Dividends payable 49    
Total 1,590    
Cost | 2025 | Credit Facilities      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 400    
Cost | 2025 | Debentures      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 0    
Cost | 2025 | Senior notes      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 0    
Cost | 2025 | Non-recourse – Hydro      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 0    
Cost | 2025 | Non-recourse – Wind & Solar      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 69    
Cost | 2025 | Non-recourse and other – Gas      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 58    
Cost | 2025 | Tax equity financing      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 15    
Cost | 2025 | Interest on exchangeable securities      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Interest on debt 53    
Cost | 2025 | Non-Recourse Heartland term facility      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 24    
Cost | 2025 | Commodity risk management (assets) liabilities(3)      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Commodity risk management (assets) liabilities(3) (55)    
Cost | 2026      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Bank overdraft 0    
Accounts payable, accrued liabilities and other current liabilities 0    
Principal repayments 169    
Exchangeable securities 0    
Other risk management (assets) liabilities (1)    
Lease liabilities 5    
Interest on debt 178    
Dividends payable 0    
Total 418    
Cost | 2026 | Credit Facilities      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 0    
Cost | 2026 | Debentures      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 0    
Cost | 2026 | Senior notes      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 0    
Cost | 2026 | Non-recourse – Hydro      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 0    
Cost | 2026 | Non-recourse – Wind & Solar      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 68    
Cost | 2026 | Non-recourse and other – Gas      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 61    
Cost | 2026 | Tax equity financing      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 16    
Cost | 2026 | Interest on exchangeable securities      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Interest on debt 53    
Cost | 2026 | Non-Recourse Heartland term facility      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 24    
Cost | 2026 | Commodity risk management (assets) liabilities(3)      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Commodity risk management (assets) liabilities(3) 14    
Cost | 2027      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Bank overdraft 0    
Accounts payable, accrued liabilities and other current liabilities 0    
Principal repayments 331    
Exchangeable securities 0    
Other risk management (assets) liabilities 0    
Lease liabilities 5    
Interest on debt 169    
Dividends payable 0    
Total 571    
Cost | 2027 | Credit Facilities      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 0    
Cost | 2027 | Debentures      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 0    
Cost | 2027 | Senior notes      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 0    
Cost | 2027 | Non-recourse – Hydro      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 0    
Cost | 2027 | Non-recourse – Wind & Solar      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 69    
Cost | 2027 | Non-recourse and other – Gas      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 65    
Cost | 2027 | Tax equity financing      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 21    
Cost | 2027 | Interest on exchangeable securities      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Interest on debt 53    
Cost | 2027 | Non-Recourse Heartland term facility      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 176    
Cost | 2027 | Commodity risk management (assets) liabilities(3)      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Commodity risk management (assets) liabilities(3) 13    
Cost | 2028      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Bank overdraft 0    
Accounts payable, accrued liabilities and other current liabilities 0    
Principal repayments 309    
Exchangeable securities 0    
Other risk management (assets) liabilities (1)    
Lease liabilities 5    
Interest on debt 151    
Dividends payable 0    
Total 528    
Cost | 2028 | Credit Facilities      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 145    
Cost | 2028 | Debentures      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 0    
Cost | 2028 | Senior notes      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 0    
Cost | 2028 | Non-recourse – Hydro      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 0    
Cost | 2028 | Non-recourse – Wind & Solar      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 74    
Cost | 2028 | Non-recourse and other – Gas      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 66    
Cost | 2028 | Tax equity financing      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 24    
Cost | 2028 | Interest on exchangeable securities      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Interest on debt 52    
Cost | 2028 | Non-Recourse Heartland term facility      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 0    
Cost | 2028 | Commodity risk management (assets) liabilities(3)      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Commodity risk management (assets) liabilities(3) 12    
Cost | 2029      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Bank overdraft 0    
Accounts payable, accrued liabilities and other current liabilities 0    
Principal repayments 824    
Exchangeable securities 0    
Other risk management (assets) liabilities (1)    
Lease liabilities 5    
Interest on debt 136    
Dividends payable 0    
Total 982    
Cost | 2029 | Credit Facilities      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 0    
Cost | 2029 | Debentures      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 110    
Cost | 2029 | Senior notes      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 575    
Cost | 2029 | Non-recourse – Hydro      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 0    
Cost | 2029 | Non-recourse – Wind & Solar      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 42    
Cost | 2029 | Non-recourse and other – Gas      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 74    
Cost | 2029 | Tax equity financing      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 23    
Cost | 2029 | Interest on exchangeable securities      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Interest on debt 12    
Cost | 2029 | Non-Recourse Heartland term facility      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 0    
Cost | 2029 | Commodity risk management (assets) liabilities(3)      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Commodity risk management (assets) liabilities(3) 6    
Cost | 2030 and thereafter      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Bank overdraft 0    
Accounts payable, accrued liabilities and other current liabilities 0    
Principal repayments 1,493    
Exchangeable securities 750    
Other risk management (assets) liabilities (4)    
Lease liabilities 127    
Interest on debt 649    
Dividends payable 0    
Total 3,192    
Cost | 2030 and thereafter | Credit Facilities      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 0    
Cost | 2030 and thereafter | Debentures      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 141    
Cost | 2030 and thereafter | Senior notes      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 431    
Cost | 2030 and thereafter | Non-recourse – Hydro      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 39    
Cost | 2030 and thereafter | Non-recourse – Wind & Solar      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 248    
Cost | 2030 and thereafter | Non-recourse and other – Gas      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 628    
Cost | 2030 and thereafter | Tax equity financing      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 6    
Cost | 2030 and thereafter | Interest on exchangeable securities      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Interest on debt 0    
Cost | 2030 and thereafter | Non-Recourse Heartland term facility      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Principal repayments 0    
Cost | 2030 and thereafter | Commodity risk management (assets) liabilities(3)      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Commodity risk management (assets) liabilities(3) $ 177