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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2022
Disclosure of other provisions, contingent liabilities and contingent assets [Abstract]  
Disclosure of commitments and future payments
In addition to commitments disclosed elsewhere in the financial statements, the Company has incurred the following additional contractual commitments, either directly or through its interests in joint operations.
Approximate future payments under these agreements are as follows:
 202320242025202620272028 and thereafterTotal
Natural gas, transportation and other contracts56 47 45 45 46 457 696 
Transmission10 7 7 3 1 39 67 
Coal supply agreements83 87 71 — — — 241 
Long-term service agreements51 49 35 32 21 140 328 
Operating leases3 3 3 2 2 29 42 
Growth446 — — — — — 446 
TransAlta Energy Transition Bill6 — — — — — 6 
Total655 193 161 82 70 665 1,826