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Commitments and Contingencies - Commitments (Details)
$ in Millions, $ in Millions
Dec. 31, 2020
CAD ($)
Jul. 30, 2015
USD ($)
Disclosure of Commitments [Line Items]    
Coal supply and mining agreements $ 410  
Long-term service agreements 173  
Operating leases 36  
Growth 1,013  
TransAlta Energy Transition Bill 18 $ 55
Total 3,733  
Natural gas, transportation and other contracts    
Disclosure of Commitments [Line Items]    
Purchase obligations 2,048  
Transmission    
Disclosure of Commitments [Line Items]    
Purchase obligations 35  
2021    
Disclosure of Commitments [Line Items]    
Coal supply and mining agreements 81  
Long-term service agreements 31  
Operating leases 4  
Growth 509  
TransAlta Energy Transition Bill 6  
Total 780  
2021 | Natural gas, transportation and other contracts    
Disclosure of Commitments [Line Items]    
Purchase obligations 141  
2021 | Transmission    
Disclosure of Commitments [Line Items]    
Purchase obligations 8  
2022    
Disclosure of Commitments [Line Items]    
Coal supply and mining agreements 105  
Long-term service agreements 37  
Operating leases 2  
Growth 411  
TransAlta Energy Transition Bill 6  
Total 718  
2022 | Natural gas, transportation and other contracts    
Disclosure of Commitments [Line Items]    
Purchase obligations 149  
2022 | Transmission    
Disclosure of Commitments [Line Items]    
Purchase obligations 8  
2023    
Disclosure of Commitments [Line Items]    
Coal supply and mining agreements 101  
Long-term service agreements 22  
Operating leases 2  
Growth 93  
TransAlta Energy Transition Bill 6  
Total 369  
2023 | Natural gas, transportation and other contracts    
Disclosure of Commitments [Line Items]    
Purchase obligations 137  
2023 | Transmission    
Disclosure of Commitments [Line Items]    
Purchase obligations 8  
2024    
Disclosure of Commitments [Line Items]    
Coal supply and mining agreements 67  
Long-term service agreements 18  
Operating leases 1  
Growth 0  
TransAlta Energy Transition Bill 0  
Total 225  
2024 | Natural gas, transportation and other contracts    
Disclosure of Commitments [Line Items]    
Purchase obligations 134  
2024 | Transmission    
Disclosure of Commitments [Line Items]    
Purchase obligations 5  
2025    
Disclosure of Commitments [Line Items]    
Coal supply and mining agreements 56  
Long-term service agreements 10  
Operating leases 1  
Growth 0  
TransAlta Energy Transition Bill 0  
Total 206  
2025 | Natural gas, transportation and other contracts    
Disclosure of Commitments [Line Items]    
Purchase obligations 134  
2025 | Transmission    
Disclosure of Commitments [Line Items]    
Purchase obligations 5  
2026    
Disclosure of Commitments [Line Items]    
Coal supply and mining agreements 0  
Long-term service agreements 55  
Operating leases 26  
Growth 0  
TransAlta Energy Transition Bill 0  
Total 1,435  
2026 | Natural gas, transportation and other contracts    
Disclosure of Commitments [Line Items]    
Purchase obligations 1,353  
2026 | Transmission    
Disclosure of Commitments [Line Items]    
Purchase obligations $ 1