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Commitments and Contingencies - Commitments (Details)
$ in Millions, $ in Millions
Dec. 31, 2021
CAD ($)
Jul. 30, 2015
USD ($)
Disclosure of Commitments [Line Items]    
Coal supply and mining agreements1 $ 339  
Long-term service agreements 289  
Operating leases 43  
Growth 1,217  
TransAlta Energy Transition Bill 12 $ 55
Total 2,675  
Natural gas, transportation and other contracts    
Disclosure of Commitments [Line Items]    
Purchase obligations 743  
Transmission    
Disclosure of Commitments [Line Items]    
Purchase obligations 32  
2022    
Disclosure of Commitments [Line Items]    
Coal supply and mining agreements1 76  
Long-term service agreements 89  
Operating leases 4  
Growth 941  
TransAlta Energy Transition Bill 6  
Total 1,172  
2022 | Natural gas, transportation and other contracts    
Disclosure of Commitments [Line Items]    
Purchase obligations 47  
2022 | Transmission    
Disclosure of Commitments [Line Items]    
Purchase obligations 9  
2023    
Disclosure of Commitments [Line Items]    
Coal supply and mining agreements1 98  
Long-term service agreements 46  
Operating leases 3  
Growth 276  
TransAlta Energy Transition Bill 6  
Total 492  
2023 | Natural gas, transportation and other contracts    
Disclosure of Commitments [Line Items]    
Purchase obligations 54  
2023 | Transmission    
Disclosure of Commitments [Line Items]    
Purchase obligations 9  
2024    
Disclosure of Commitments [Line Items]    
Coal supply and mining agreements1 90  
Long-term service agreements 43  
Operating leases 3  
Growth 0  
TransAlta Energy Transition Bill 0  
Total 187  
2024 | Natural gas, transportation and other contracts    
Disclosure of Commitments [Line Items]    
Purchase obligations 45  
2024 | Transmission    
Disclosure of Commitments [Line Items]    
Purchase obligations 6  
2025    
Disclosure of Commitments [Line Items]    
Coal supply and mining agreements1 75  
Long-term service agreements 32  
Operating leases 1  
Growth 0  
TransAlta Energy Transition Bill 0  
Total 158  
2025 | Natural gas, transportation and other contracts    
Disclosure of Commitments [Line Items]    
Purchase obligations 44  
2025 | Transmission    
Disclosure of Commitments [Line Items]    
Purchase obligations 6  
2026    
Disclosure of Commitments [Line Items]    
Coal supply and mining agreements1 0  
Long-term service agreements 25  
Operating leases 1  
Growth 0  
TransAlta Energy Transition Bill 0  
Total 73  
2026 | Natural gas, transportation and other contracts    
Disclosure of Commitments [Line Items]    
Purchase obligations 45  
2026 | Transmission    
Disclosure of Commitments [Line Items]    
Purchase obligations 2  
2027    
Disclosure of Commitments [Line Items]    
Coal supply and mining agreements1 0  
Long-term service agreements 54  
Operating leases 31  
Growth 0  
TransAlta Energy Transition Bill 0  
Total 593  
2027 | Natural gas, transportation and other contracts    
Disclosure of Commitments [Line Items]    
Purchase obligations 508  
2027 | Transmission    
Disclosure of Commitments [Line Items]    
Purchase obligations $ 0