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Other Assets - Disclosure of Components in Other Assets (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of financial assets [line items]    
South Hedland prepaid transmission access and distribution costs $ 58 $ 60
TransAlta Energy Transition Bill commitment 30 32
Long-term prepaids and other assets 35 9
Project development costs 15 35
Transmission infrastructure 17 18
Total other assets 180 180
Total current other assets 1 1
Total long-term other assets 179 179
Amortized cost | Loans And Notes Receivable    
Disclosure of financial assets [line items]    
Loans receivable $ 25 $ 26