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Expenses by Nature - Expenses Classified by Nature (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of products and services [line items]      
Mine depreciation $ 144 $ 119 $ 136
Salaries and benefits 24 28 32
Other operating expenses 0 1 0
Total 968 1,086 1,100
Total 472 475 515
Fuel, carbon compliance and purchased power      
Disclosure of products and services [line items]      
Fuel and carbon compliance 574 669 656
Coal inventory writedown (Note 17) 37 0 0
Purchased power 163 246 210
Mine depreciation 144 119 136
Salaries and benefits 50 52 98
Other operating expenses 0 0 0
Total 968 1,086 1,100
Operations, maintenance and administration      
Disclosure of products and services [line items]      
Fuel and carbon compliance 0 0 0
Coal inventory writedown (Note 17) 0 0 0
Purchased power 0 0 0
Mine depreciation 0 0 0
Salaries and benefits 235 228 245
Other operating expenses 237 247 270
Total $ 472 $ 475 $ 515