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Risk Management Activities - Maturity Analysis of Financial Liabilities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Bank overdraft $ 3 $ 16
Accounts payable and accrued liabilities 797 1,346
Principal repayments 3,466 3,653
Exchangeable securities 744 739
Dividends payable 49 68
Other    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 0 $ 1
2024    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Lease incentive 12  
Cost    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Bank overdraft 3  
Accounts payable and accrued liabilities 797  
Principal repayments 3,363  
Exchangeable securities 750  
Other risk management assets (19)  
Lease liabilities 143  
Interest expense on borrowings 1,516  
Dividends payable 49  
Total 7,284  
Cost | Credit Facilities    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 400  
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 924  
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 636  
Cost | Non-recourse and other – Gas    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 1,003  
Cost | Tax equity financing    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 110  
Cost | Interest on exchangeable securities    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Interest expense on borrowings 278  
Cost | Commodity risk management liabilities    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Commodity risk management liabilities 404  
Cost | 2024    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Bank overdraft 3  
Accounts payable and accrued liabilities 797  
Principal repayments 526  
Exchangeable securities 0  
Other risk management assets (16)  
Lease liabilities 4  
Interest expense on borrowings 186  
Dividends payable 49  
Total 1,771  
Cost | 2024 | Credit Facilities    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 400  
Cost | 2024 | Debentures    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 0  
Cost | 2024 | Senior notes    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 0  
Cost | 2024 | Non-recourse – Hydro    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 0  
Cost | 2024 | Non-recourse – Wind & Solar    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 66  
Cost | 2024 | Non-recourse and other – Gas    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 46  
Cost | 2024 | Tax equity financing    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 14  
Cost | 2024 | Interest on exchangeable securities    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Interest expense on borrowings 53  
Cost | 2024 | Commodity risk management liabilities    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Commodity risk management liabilities 169  
Cost | 2025    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Bank overdraft 0  
Accounts payable and accrued liabilities 0  
Principal repayments 142  
Exchangeable securities 0  
Other risk management assets (3)  
Lease liabilities 4  
Interest expense on borrowings 167  
Dividends payable 0  
Total 486  
Cost | 2025 | Credit Facilities    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 0  
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 expense on borrowings 53  
Cost | 2025 | Commodity risk management liabilities    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Commodity risk management liabilities 123  
Cost | 2026    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Bank overdraft 0  
Accounts payable and accrued liabilities 0  
Principal repayments 143  
Exchangeable securities 0  
Other risk management assets 0  
Lease liabilities 4  
Interest expense on borrowings 158  
Dividends payable 0  
Total 373  
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 67  
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 15  
Cost | 2026 | Interest on exchangeable securities    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Interest expense on borrowings 53  
Cost | 2026 | Commodity risk management liabilities    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Commodity risk management liabilities 15  
Cost | 2027    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Bank overdraft 0  
Accounts payable and accrued liabilities 0  
Principal repayments 153  
Exchangeable securities 0  
Other risk management assets 0  
Lease liabilities 4  
Interest expense on borrowings 151  
Dividends payable 0  
Total 373  
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 70  
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 18  
Cost | 2027 | Interest on exchangeable securities    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Interest expense on borrowings 53  
Cost | 2027 | Commodity risk management liabilities    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Commodity risk management liabilities 12  
Cost | 2028    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Bank overdraft 0  
Accounts payable and accrued liabilities 0  
Principal repayments 162  
Exchangeable securities 0  
Other risk management assets 0  
Lease liabilities 4  
Interest expense on borrowings 143  
Dividends payable 0  
Total 374  
Cost | 2028 | Credit Facilities    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 0  
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 75  
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 21  
Cost | 2028 | Interest on exchangeable securities    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Interest expense on borrowings 53  
Cost | 2028 | Commodity risk management liabilities    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Commodity risk management liabilities 12  
Cost | 2029 and thereafter    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Bank overdraft 0  
Accounts payable and accrued liabilities 0  
Principal repayments 2,237  
Exchangeable securities 750  
Other risk management assets 0  
Lease liabilities 123  
Interest expense on borrowings 711  
Dividends payable 0  
Total 3,907  
Cost | 2029 and thereafter | Credit Facilities    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 0  
Cost | 2029 and thereafter | Debentures    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 251  
Cost | 2029 and thereafter | Senior notes    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 924  
Cost | 2029 and thereafter | Non-recourse – Hydro    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 39  
Cost | 2029 and thereafter | Non-recourse – Wind & Solar    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 289  
Cost | 2029 and thereafter | Non-recourse and other – Gas    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 707  
Cost | 2029 and thereafter | Tax equity financing    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 27  
Cost | 2029 and thereafter | Interest on exchangeable securities    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Interest expense on borrowings 13  
Cost | 2029 and thereafter | Commodity risk management liabilities    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Commodity risk management liabilities $ 73