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Expenses by Nature - Expenses Classified by Nature (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of products and services [line items]      
Mine depreciation $ 190 $ 144 $ 119
Salaries and benefits 14 24 28
Total 511 472  
Adjustments for impairment loss (reversal of impairment loss) recognised in profit or loss, inventories 17 15  
Write-downs 28 0  
Coal      
Disclosure of products and services [line items]      
Write-downs 65 37  
Fuel and purchased power      
Disclosure of products and services [line items]      
Gas fuel costs 306 159 133
Coal fuel costs 164 269 310
Royalty, land lease, other direct costs 19 20 21
Purchased power 339 163 246
Mine depreciation 190 144 119
Salaries and benefits 36 50 52
Other expenses 0 0 0
Total 1,054 805 881
Fuel and purchased power | Coal      
Disclosure of products and services [line items]      
Mine depreciation 48 22  
OM&A      
Disclosure of products and services [line items]      
Gas fuel costs 0 0 0
Coal fuel costs 0 0 0
Royalty, land lease, other direct costs 0 0 0
Purchased power 0 0 0
Mine depreciation 0 0 0
Salaries and benefits 234 235 228
Other expenses 277 237 247
Total 511 $ 472 $ 475
Write-downs $ 28