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Expenses by Nature - Expenses Classified by Nature (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of products and services [line items]      
Mine depreciation $ 0 $ 0 $ 190
Total     511
Adjustments for impairment loss (reversal of impairment loss) recognised in profit or loss, inventories     17
Fuel and purchased power      
Disclosure of products and services [line items]      
Gas fuel costs 384 578 306
Coal fuel costs 177 146 164
Royalty, land lease, other direct costs 25 25 19
Purchased power 474 514 339
Mine depreciation 0 0 190
Salaries and benefits 0 0 36
Other operating expenses 0 0 0
Total 1,060 1,263 1,054
Fuel and purchased power | Coal      
Disclosure of products and services [line items]      
Mine depreciation     48
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 254 263 234
Other operating expenses 285 258 277
Total 539 $ 521 511
Write-downs $ 14   $ 28