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Segments Disclosures - Selected Consolidated Statements of Financial Position Information (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [line items]      
PP&E $ 5,822 $ 6,207 $ 6,164
Right-of-use assets 141 146 52
Intangible assets 313 318 $ 373
Goodwill 463 464  
Wind and Solar      
Disclosure of operating segments [line items]      
Goodwill 175 176  
Energy Marketing      
Disclosure of operating segments [line items]      
Goodwill 30 30  
Corporate      
Disclosure of operating segments [line items]      
PP&E 16 17  
Right-of-use assets 22 12  
Intangible assets 41 45  
Goodwill 0 0  
Operating segments | Hydro      
Disclosure of operating segments [line items]      
PP&E 467 469  
Right-of-use assets 6 6  
Intangible assets 4 5  
Goodwill 258 258  
Operating segments | Wind and Solar      
Disclosure of operating segments [line items]      
PP&E 2,005 1,947  
Right-of-use assets 55 56  
Intangible assets 159 173  
Goodwill 175 176  
Operating segments | North American Gas      
Disclosure of operating segments [line items]      
PP&E 382 392  
Right-of-use assets 1 0  
Intangible assets 32 2  
Goodwill 0 0  
Operating segments | Australian Gas      
Disclosure of operating segments [line items]      
PP&E 421 489  
Right-of-use assets 4 4  
Intangible assets 34 37  
Goodwill 0 0  
Operating segments | Alberta Thermal      
Disclosure of operating segments [line items]      
PP&E 2,271 2,540  
Right-of-use assets 53 68  
Intangible assets 31 41  
Goodwill 0 0  
Operating segments | Centralia      
Disclosure of operating segments [line items]      
PP&E 260 352  
Right-of-use assets 0 0  
Intangible assets 5 6  
Goodwill 0 0  
Operating segments | Energy Marketing      
Disclosure of operating segments [line items]      
PP&E 0 1  
Right-of-use assets 0 0  
Intangible assets 7 9  
Goodwill $ 30 $ 30