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Expenses by Nature - Expenses Classified by Nature (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of products and services [line items]      
Total $ 655   $ 521
Fuel and purchased power      
Disclosure of products and services [line items]      
Gas fuel costs 369 $ 384 578
Coal fuel costs 123 177 146
Royalty, land lease, other direct costs 28 25 25
Purchased power 419 474 514
Salaries and benefits 0 0 0
Other operating expenses 0 0 0
Total 939 1,060 1,263
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
Salaries and benefits 296 254 263
Other operating expenses 359 285 258
Total $ 655 539 $ 521
Write-downs   $ 14