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Expenses by Nature - Expenses Classified by Nature (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of products and services [line items]      
Mine depreciation $ 136 $ 73 $ 63
Salaries and benefits(1) 32 32 37
Total 1,100 1,016 963
Adjustments for increase (decrease) in employee benefit liabilities   90 90
Fuel and purchased power      
Disclosure of products and services [line items]      
Fuel(1) 656 685 665
Coal inventory writedown (recovery) 0 0 (4)
Purchased power 210 162 143
Mine depreciation 136 73 63
Salaries and benefits(1) 98 96 96
Other operating expenses 0 0 0
Total 1,100 1,016 963
Operations, maintenance and administration      
Disclosure of products and services [line items]      
Fuel(1) 0 0 0
Coal inventory writedown (recovery) 0 0 0
Purchased power 0 0 0
Mine depreciation 0 0 0
Salaries and benefits(1) 245 248 249
Other operating expenses 270 269 240
Total $ 515 $ 517 $ 489