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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2019
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 Corporation has other contractual commitments, either directly or through its interests in joint operations. Approximate future payments under these agreements are as follows:
 202020212022202320242025 and thereafterTotal
Natural gas, transportation and
other contracts		125  125  120  128  131  1,493  2,122  
Transmission9  5  4  3  —  —  21  
Coal supply and mining
agreements		147  16  16  16  8  14  217  
Long-term service agreements50  22  32  17  15  14  150  
Operating leases4  2  2  2  3  64  77  
Growth535  254  196  270  13  —  1,268  
TransAlta Energy Transition Bill6  6  6  6  —  —  24  
Total876  430  376  442  170  1,585  3,879