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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2020
Disclosure of other provisions, contingent liabilities and contingent assets [Abstract]  
Disclosure of commitments and future payments
Skookumchuck's approximate future payments under contractual commitments are as follows:
 202120222023202420252026 and thereafterTotal
Long-term service agreements(1)
1 1 1 1 1 28 33 
(1) Refer to Note 36 for further details on long-term service agreements.
In addition to commitments disclosed elsewhere in the financial statements, the Corporation 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:
 202120222023202420252026 and thereafterTotal
Natural gas, transportation and
other contracts		141 149 137 134 134 1,353 2,048 
Transmission8 8 8 5 5 1 35 
Coal supply and mining
agreements		81 105 101 67 56 — 410 
Long-term service agreements31 37 22 18 10 55 173 
Operating leases4 2 2 1 1 26 36 
Growth509 411 93 — — — 1,013 
TransAlta Energy Transition Bill6 6 6 — — — 18 
Total780 718 369 225 206 1,435 3,733