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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2021
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:
 202220232024202520262027 and thereafterTotal
Natural gas, transportation and
  other contracts		47 54 45 44 45 508 743 
Transmission9 9 6 6 2 — 32 
Coal supply and mining
   agreements1
76 98 90 75 — — 339 
Long-term service agreements89 46 43 32 25 54 289 
Operating leases4 3 3 1 1 31 43 
Growth941 276 — — — — 1,217 
TransAlta Energy Transition Bill6 6 — — — — 12 
Total1,172 492 187 158 73 593 2,675 
(1) Relates to coal supply and mining agreements for Centralia Unit 2.