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Expenses by Nature - Expenses Classified by Nature (Details) - CAD
CAD in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of products and services [line items]      
Mine depreciation CAD 73 CAD 63 CAD 59
Salaries and benefits 32 37 35
Total 1,016 963 1,008
Fuel and purchased power      
Disclosure of products and services [line items]      
Fuel 775 755 775
Coal inventory writedown (recovery) 0 (4) 22
Purchased power 162 143 147
Mine depreciation 73 63 59
Salaries and benefits 6 6 5
Other operating expenses 0 0 0
Total 1,016 963 1,008
Operations, maintenance, and administration      
Disclosure of products and services [line items]      
Fuel 0 0 0
Coal inventory writedown (recovery) 0 0 0
Purchased power 0 0 0
Mine depreciation 0 0 0
Salaries and benefits 248 249 250
Other operating expenses 269 240 242
Total CAD 517 CAD 489 CAD 492