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Business Acquisitions and Divestitures - Fair values of the identifiable assets and liabilities of the acquired entity in the business combination (Details) - CAD ($)
$ in Millions
Nov. 05, 2021
May 19, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about business combination [line items]          
Right-of-use assets     $ 95 $ 141 $ 146
North Carolina Solar          
Disclosure of detailed information about business combination [line items]          
Cash and cash equivalents $ 4        
Accounts receivable 4        
Property, plant and equipment 146        
Right-of-use assets 13        
Accounts payable and accrued liabilities (4)        
Lease liabilities (13)        
Tax equity liability (20)        
Deferred taxes (3)        
Decommissioning provisions (4)        
Net assets acquired 123        
Aggregate value of business combination 120        
Working capital consideration 3        
Consideration received $ 123        
Ada Facility          
Disclosure of detailed information about business combination [line items]          
Cash and cash equivalents   $ 1      
Accounts receivable   3      
Property, plant and equipment   1      
Intangible assets   37      
Inventory recognised as of acquisition date   1      
Prepaid Expense Recognised As Of Acquisition Date   1      
Current Derivative Financial Liabilities Recognised As Of Acquisition Date   (5)      
Decommissioning provisions   (1)      
Net assets acquired   38      
Aggregate value of business combination   32      
Working capital consideration   6      
Consideration received   $ 38