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Credit Facilities, Long-Term Debt and Lease Liabilities - Other (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Oct. 22, 2020
Jul. 20, 2018
Disclosure of detailed information about borrowings [line items]          
Interest rate       4.07% 4.509%
US Wind Projects - Big Level          
Disclosure of detailed information about borrowings [line items]          
Borrowing costs incurred $ 112 $ 122      
Tax equity funding     $ 85    
Lakeswind          
Disclosure of detailed information about borrowings [line items]          
Borrowing costs incurred $ 22 23      
US Wind Projects - Antrim          
Disclosure of detailed information about borrowings [line items]          
Tax equity funding     $ 41    
Accelerated tax depreciation   $ 35      
Other | 5.9% Unsecured Commercial Loan Obligation due 2023          
Disclosure of detailed information about borrowings [line items]          
Interest rate   5.90% 5.90%