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Risk Management Activities - Maturity Analysis of Financial Liabilities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Accounts payable and accrued liabilities $ 689 $ 599
Borrowings 3,267 3,361
Exchangeable securities 735 730
Dividends payable 62 59
Other    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 4 $ 7
2022    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Lease commitments for short-term leases for which recognition exemption has been used 13  
Gross carrying amount    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Accounts payable and accrued liabilities 689  
Borrowings 3,198  
Exchangeable securities 750  
Derivative financial assets 8  
Lease liabilities 100  
Interest expense on borrowings 1,384  
Dividends payable 62  
Liabilities 6,050  
Gross carrying amount | Debentures    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 251  
Gross carrying amount | Senior notes    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 894  
Gross carrying amount | Non-Recourse - Hydro    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 45  
Gross carrying amount | Non-Recourse - Wind & Solar    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 752  
Gross carrying amount | Non-Recourse - Gas    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 1,111  
Gross carrying amount | Tax Equity Financing    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 141  
Gross carrying amount | Other    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 4  
Gross carrying amount | 7% Unsecured Subordinated Debentures Due May 1, 2039    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Interest expense on borrowings 168  
Gross carrying amount | Commodity risk management    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative financial liabilities (293)  
Gross carrying amount | 2022    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Accounts payable and accrued liabilities 689  
Borrowings 836  
Exchangeable securities 0  
Derivative financial assets 2  
Lease liabilities (6)  
Interest expense on borrowings 149  
Dividends payable 62  
Liabilities 1,736  
Gross carrying amount | 2022 | Debentures    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 0  
Gross carrying amount | 2022 | Senior notes    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 511  
Gross carrying amount | 2022 | Non-Recourse - Hydro    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 0  
Gross carrying amount | 2022 | Non-Recourse - Wind & Solar    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 263  
Gross carrying amount | 2022 | Non-Recourse - Gas    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 44  
Gross carrying amount | 2022 | Tax Equity Financing    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 15  
Gross carrying amount | 2022 | Other    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 3  
Gross carrying amount | 2022 | 7% Unsecured Subordinated Debentures Due May 1, 2039    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Interest expense on borrowings 53  
Gross carrying amount | 2022 | Commodity risk management    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative financial liabilities (45)  
Gross carrying amount | 2023    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Accounts payable and accrued liabilities 0  
Borrowings 155  
Exchangeable securities 0  
Derivative financial assets 3  
Lease liabilities 4  
Interest expense on borrowings 120  
Dividends payable 0  
Liabilities 294  
Gross carrying amount | 2023 | Debentures    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 0  
Gross carrying amount | 2023 | Senior notes    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 0  
Gross carrying amount | 2023 | Non-Recourse - Hydro    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 45  
Gross carrying amount | 2023 | Non-Recourse - Wind & Solar    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 49  
Gross carrying amount | 2023 | Non-Recourse - Gas    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 45  
Gross carrying amount | 2023 | Tax Equity Financing    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 15  
Gross carrying amount | 2023 | Other    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 1  
Gross carrying amount | 2023 | 7% Unsecured Subordinated Debentures Due May 1, 2039    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Interest expense on borrowings 53  
Gross carrying amount | 2023 | Commodity risk management    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative financial liabilities (35)  
Gross carrying amount | 2024    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Accounts payable and accrued liabilities 0  
Borrowings 113  
Exchangeable securities 0  
Derivative financial assets 3  
Lease liabilities 3  
Interest expense on borrowings 115  
Dividends payable 0  
Liabilities 173  
Gross carrying amount | 2024 | Debentures    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 0  
Gross carrying amount | 2024 | Senior notes    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 0  
Gross carrying amount | 2024 | Non-Recourse - Hydro    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 0  
Gross carrying amount | 2024 | Non-Recourse - Wind & Solar    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 52  
Gross carrying amount | 2024 | Non-Recourse - Gas    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 47  
Gross carrying amount | 2024 | Tax Equity Financing    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 14  
Gross carrying amount | 2024 | Other    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 0  
Gross carrying amount | 2024 | 7% Unsecured Subordinated Debentures Due May 1, 2039    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Interest expense on borrowings 62  
Gross carrying amount | 2024 | Commodity risk management    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative financial liabilities (117)  
Gross carrying amount | 2025    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Accounts payable and accrued liabilities 0  
Borrowings 127  
Exchangeable securities 750  
Derivative financial liabilities 1  
Lease liabilities 3  
Interest expense on borrowings 109  
Dividends payable 0  
Liabilities 895  
Gross carrying amount | 2025 | Debentures    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 0  
Gross carrying amount | 2025 | Senior notes    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 0  
Gross carrying amount | 2025 | Non-Recourse - Hydro    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 0  
Gross carrying amount | 2025 | Non-Recourse - Wind & Solar    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 54  
Gross carrying amount | 2025 | Non-Recourse - Gas    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 59  
Gross carrying amount | 2025 | Tax Equity Financing    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 14  
Gross carrying amount | 2025 | Other    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 0  
Gross carrying amount | 2025 | 7% Unsecured Subordinated Debentures Due May 1, 2039    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Interest expense on borrowings 0  
Gross carrying amount | 2025 | Commodity risk management    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative financial liabilities (95)  
Gross carrying amount | 2026    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Accounts payable and accrued liabilities 0  
Borrowings 127  
Exchangeable securities 0  
Derivative financial assets 0  
Lease liabilities 3  
Interest expense on borrowings 104  
Dividends payable 0  
Liabilities 235  
Gross carrying amount | 2026 | Debentures    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 0  
Gross carrying amount | 2026 | Senior notes    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 0  
Gross carrying amount | 2026 | Non-Recourse - Hydro    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 0  
Gross carrying amount | 2026 | Non-Recourse - Wind & Solar    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 51  
Gross carrying amount | 2026 | Non-Recourse - Gas    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 61  
Gross carrying amount | 2026 | Tax Equity Financing    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 15  
Gross carrying amount | 2026 | Other    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 0  
Gross carrying amount | 2026 | 7% Unsecured Subordinated Debentures Due May 1, 2039    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Interest expense on borrowings 0  
Gross carrying amount | 2026 | Commodity risk management    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative financial assets (1)  
Gross carrying amount | More than five years    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Accounts payable and accrued liabilities 0  
Borrowings 1,840  
Exchangeable securities 0  
Derivative financial assets 1  
Lease liabilities 93  
Interest expense on borrowings 787  
Dividends payable 0  
Liabilities 2,717  
Gross carrying amount | More than five years | Debentures    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 251  
Gross carrying amount | More than five years | Senior notes    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 383  
Gross carrying amount | More than five years | Non-Recourse - Hydro    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 0  
Gross carrying amount | More than five years | Non-Recourse - Wind & Solar    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 283  
Gross carrying amount | More than five years | Non-Recourse - Gas    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 855  
Gross carrying amount | More than five years | Tax Equity Financing    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 68  
Gross carrying amount | More than five years | Other    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Borrowings 0  
Gross carrying amount | More than five years | 7% Unsecured Subordinated Debentures Due May 1, 2039    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Interest expense on borrowings 0  
Gross carrying amount | More than five years | Commodity risk management    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative financial liabilities $ (2)