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Property, Plant, and Equipment (Details) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 01, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Disclosure of detailed information about property, plant and equipment [line items]          
Right-of-use assets   $ 146 $ 0    
Property, plant and equipment expenditures   417 277 $ 338  
Gains (losses) on disposals of property, plant and equipment   17      
Other cash and cash equivalents   15      
Interest costs capitalised   $ 6 $ 2 $ 9  
Capitalisation rate of borrowing costs eligible for capitalisation   5.90% 4.50%    
US Wind Projects          
Disclosure of detailed information about property, plant and equipment [line items]          
Property, plant and equipment expenditures   $ 169      
Pioneer Pipeline          
Disclosure of detailed information about property, plant and equipment [line items]          
Property, plant and equipment expenditures   100      
Genesee Unit 3          
Disclosure of detailed information about property, plant and equipment [line items]          
Additions other than through business combinations, property, plant and equipment   5      
Keephills 3          
Disclosure of detailed information about property, plant and equipment [line items]          
Additions other than through business combinations, property, plant and equipment $ 308 308      
IFRS 16          
Disclosure of detailed information about property, plant and equipment [line items]          
Assets under finance leases         $ (29)
Right-of-use assets   146 $ 52   $ 85
Mining property and equipment          
Disclosure of detailed information about property, plant and equipment [line items]          
Assets under finance leases   0 65    
Gains (losses) on disposals of property, plant and equipment   18      
Coal generation | Keephills 3          
Disclosure of detailed information about property, plant and equipment [line items]          
Additions other than through business combinations, property, plant and equipment   300      
Property, plant and equipment subject to operating leases | IFRS 16          
Disclosure of detailed information about property, plant and equipment [line items]          
Right-of-use assets   33      
Gross carrying amount          
Disclosure of detailed information about property, plant and equipment [line items]          
Additions other than through business combinations, property, plant and equipment   522 284    
Gross carrying amount | Mining property and equipment          
Disclosure of detailed information about property, plant and equipment [line items]          
Additions other than through business combinations, property, plant and equipment   0 0    
Gross carrying amount | Coal generation          
Disclosure of detailed information about property, plant and equipment [line items]          
Additions other than through business combinations, property, plant and equipment   0 0    
Gross carrying amount | Assets under construction          
Disclosure of detailed information about property, plant and equipment [line items]          
Additions other than through business combinations, property, plant and equipment   $ 407 275    
Gross carrying amount | Assets under construction | US Wind Projects - Big Level          
Disclosure of detailed information about property, plant and equipment [line items]          
Additions other than through business combinations, property, plant and equipment     $ 7