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Segments Disclosures - Additions to non-current assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [line items]      
Property, plant and equipment expenditures $ 486 $ 417 $ 277
Purchase of intangible assets 14 14 20
Corporate      
Disclosure of operating segments [line items]      
Property, plant and equipment expenditures 13 1 2
Purchase of intangible assets 13 12 17
Operating segments | Hydro      
Disclosure of operating segments [line items]      
Property, plant and equipment expenditures 22 23 16
Purchase of intangible assets 0 0 0
Operating segments | Wind and Solar      
Disclosure of operating segments [line items]      
Property, plant and equipment expenditures 174 229 117
Purchase of intangible assets 0 0 0
Operating segments | North American Gas      
Disclosure of operating segments [line items]      
Property, plant and equipment expenditures 39 36 21
Purchase of intangible assets 0 0 0
Operating segments | Australian Gas      
Disclosure of operating segments [line items]      
Property, plant and equipment expenditures 10 6 6
Purchase of intangible assets 0 0 0
Operating segments | Alberta Thermal      
Disclosure of operating segments [line items]      
Property, plant and equipment expenditures 200 114 101
Purchase of intangible assets 1 2 3
Operating segments | Centralia      
Disclosure of operating segments [line items]      
Property, plant and equipment expenditures 28 8 14
Purchase of intangible assets 0 0 0
Operating segments | Energy Marketing      
Disclosure of operating segments [line items]      
Property, plant and equipment expenditures 0 0 0
Purchase of intangible assets $ 0 $ 0 $ 0