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Expenses by Nature - Expenses Classified by Nature (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of products and services [line items]      
Mine depreciation $ 119 $ 136 $ 73
Salaries and benefits(1) 28 32 32
Other operating expenses 2 0 0
Total 1,086 1,100 1,016
Adjustments for increase (decrease) in employee benefit liabilities     90
Fuel and purchased power      
Disclosure of products and services [line items]      
Fuel(1) 669 656 685
Purchased power 246 210 162
Mine depreciation 119 136 73
Salaries and benefits(1) 52 98 96
Other operating expenses 0 0 0
Total 1,086 1,100 1,016
Operations, maintenance and administration      
Disclosure of products and services [line items]      
Fuel(1) 0 0 0
Purchased power 0 0 0
Mine depreciation 0 0 0
Salaries and benefits(1) 228 245 248
Other operating expenses 247 270 269
Total $ 475 $ 515 $ 517