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Commitments and Contingencies - Commitments (Details)
$ in Millions, $ in Millions
Dec. 31, 2022
CAD ($)
Jul. 30, 2015
USD ($)
Disclosure of Commitments [Line Items]    
Coal supply agreements $ 241  
Long-term service agreements 328  
Operating leases 42  
Growth 446  
TransAlta Energy Transition Bill 6 $ 55
Total 1,826  
Natural gas, transportation and other contracts    
Disclosure of Commitments [Line Items]    
Purchase obligations 696  
Transmission    
Disclosure of Commitments [Line Items]    
Purchase obligations 67  
2023    
Disclosure of Commitments [Line Items]    
Coal supply agreements 83  
Long-term service agreements 51  
Operating leases 3  
Growth 446  
TransAlta Energy Transition Bill 6  
Total 655  
2023 | Natural gas, transportation and other contracts    
Disclosure of Commitments [Line Items]    
Purchase obligations 56  
2023 | Transmission    
Disclosure of Commitments [Line Items]    
Purchase obligations 10  
2024    
Disclosure of Commitments [Line Items]    
Coal supply agreements 87  
Long-term service agreements 49  
Operating leases 3  
Growth 0  
TransAlta Energy Transition Bill 0  
Total 193  
2024 | Natural gas, transportation and other contracts    
Disclosure of Commitments [Line Items]    
Purchase obligations 47  
2024 | Transmission    
Disclosure of Commitments [Line Items]    
Purchase obligations 7  
2025    
Disclosure of Commitments [Line Items]    
Coal supply agreements 71  
Long-term service agreements 35  
Operating leases 3  
Growth 0  
TransAlta Energy Transition Bill 0  
Total 161  
2025 | Natural gas, transportation and other contracts    
Disclosure of Commitments [Line Items]    
Purchase obligations 45  
2025 | Transmission    
Disclosure of Commitments [Line Items]    
Purchase obligations 7  
2026    
Disclosure of Commitments [Line Items]    
Coal supply agreements 0  
Long-term service agreements 32  
Operating leases 2  
Growth 0  
TransAlta Energy Transition Bill 0  
Total 82  
2026 | Natural gas, transportation and other contracts    
Disclosure of Commitments [Line Items]    
Purchase obligations 45  
2026 | Transmission    
Disclosure of Commitments [Line Items]    
Purchase obligations 3  
2027    
Disclosure of Commitments [Line Items]    
Coal supply agreements 0  
Long-term service agreements 21  
Operating leases 2  
Growth 0  
TransAlta Energy Transition Bill 0  
Total 70  
2027 | Natural gas, transportation and other contracts    
Disclosure of Commitments [Line Items]    
Purchase obligations 46  
2027 | Transmission    
Disclosure of Commitments [Line Items]    
Purchase obligations 1  
2028    
Disclosure of Commitments [Line Items]    
Coal supply agreements 0  
Long-term service agreements 140  
Operating leases 29  
Growth 0  
TransAlta Energy Transition Bill 0  
Total 665  
2028 | Natural gas, transportation and other contracts    
Disclosure of Commitments [Line Items]    
Purchase obligations 457  
2028 | Transmission    
Disclosure of Commitments [Line Items]    
Purchase obligations $ 39