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Risk Management Activities - Maturity Analysis of Financial Liabilities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Bank overdraft $ 16 $ 0
Accounts payable and accrued liabilities 1,346 689
Principal repayments 3,653 3,267
Exchangeable securities 739 735
Dividends payable 68 62
Other    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 1 $ 4
2023    
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 16  
Accounts payable and accrued liabilities 1,346  
Principal repayments 3,563  
Exchangeable securities 750  
Other risk management (assets) liabilities (6)  
Lease liabilities 135  
Interest expense on borrowings 1,707  
Dividends payable 68  
Total 8,291  
Cost | Credit Facilities    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 433  
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 949  
Cost | Non-recourse — Hydro    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 45  
Cost | Non-recourse — Wind & Solar    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 698  
Cost | Non-recourse — Gas    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 1,057  
Cost | Tax equity financing    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 129  
Cost | Other    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 1  
Cost | Interest on exchangeable securities    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Interest expense on borrowings 114  
Cost | Commodity risk management (assets) liabilities    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Commodity risk management (assets) liabilities 586  
Cost | 2023    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Bank overdraft 16  
Accounts payable and accrued liabilities 1,346  
Principal repayments 170  
Exchangeable securities 0  
Other risk management (assets) liabilities (7)  
Lease liabilities (7)  
Interest expense on borrowings 205  
Dividends payable 68  
Total 2,272  
Cost | 2023 | Credit Facilities    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 0  
Cost | 2023 | Debentures    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 0  
Cost | 2023 | Senior notes    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 0  
Cost | 2023 | Non-recourse — Hydro    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 45  
Cost | 2023 | Non-recourse — Wind & Solar    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 63  
Cost | 2023 | Non-recourse — Gas    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 45  
Cost | 2023 | Tax equity financing    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 16  
Cost | 2023 | Other    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 1  
Cost | 2023 | Interest on exchangeable securities    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Interest expense on borrowings 52  
Cost | 2023 | Commodity risk management (assets) liabilities    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Commodity risk management (assets) liabilities 415  
Cost | 2024    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Bank overdraft 0  
Accounts payable and accrued liabilities 0  
Principal repayments 527  
Exchangeable securities 0  
Other risk management (assets) liabilities 1  
Lease liabilities 4  
Interest expense on borrowings 192  
Dividends payable 0  
Total 966  
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 — 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 15  
Cost | 2024 | Other    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 0  
Cost | 2024 | Interest on exchangeable securities    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Interest expense on borrowings 62  
Cost | 2024 | Commodity risk management (assets) liabilities    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Commodity risk management (assets) liabilities 182  
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 750  
Other risk management (assets) liabilities (1)  
Lease liabilities 4  
Interest expense on borrowings 166  
Dividends payable 0  
Total 1,021  
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 — 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 | Other    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 0  
Cost | 2025 | Interest on exchangeable securities    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Interest expense on borrowings 0  
Cost | 2025 | Commodity risk management (assets) liabilities    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Commodity risk management (assets) liabilities (42)  
Cost | 2026    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Bank overdraft 0  
Accounts payable and accrued liabilities 0  
Principal repayments 177  
Exchangeable securities 0  
Other risk management (assets) liabilities 0  
Lease liabilities 3  
Interest expense on borrowings 158  
Dividends payable 0  
Total 353  
Cost | 2026 | Credit Facilities    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 33  
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 — 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 | Other    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 0  
Cost | 2026 | Interest on exchangeable securities    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Interest expense on borrowings 0  
Cost | 2026 | Commodity risk management (assets) liabilities    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Commodity risk management (assets) 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 154  
Exchangeable securities 0  
Other risk management (assets) liabilities 0  
Lease liabilities 4  
Interest expense on borrowings 150  
Dividends payable 0  
Total 316  
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 — 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 19  
Cost | 2027 | Other    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 0  
Cost | 2027 | Interest on exchangeable securities    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Interest expense on borrowings 0  
Cost | 2027 | Commodity risk management (assets) liabilities    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Commodity risk management (assets) liabilities 8  
Cost | 2028    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Bank overdraft 0  
Accounts payable and accrued liabilities 0  
Principal repayments 2,393  
Exchangeable securities 0  
Other risk management (assets) liabilities 1  
Lease liabilities 127  
Interest expense on borrowings 836  
Dividends payable 0  
Total 3,363  
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 251  
Cost | 2028 | Senior notes    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 949  
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 363  
Cost | 2028 | Non-recourse — Gas    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 782  
Cost | 2028 | Tax equity financing    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 48  
Cost | 2028 | Other    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Principal repayments 0  
Cost | 2028 | Interest on exchangeable securities    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Interest expense on borrowings 0  
Cost | 2028 | Commodity risk management (assets) liabilities    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Commodity risk management (assets) liabilities $ 8