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Related Party Transactions (Notes)
12 Months Ended
Dec. 31, 2019
Related Party [Abstract]  
Related Party Transactions Related-Party Transactions
Details of the Corporation’s principal operating subsidiaries at Dec. 31, 2019, are as follows:

SubsidiaryCountryOwnership
(per cent)
Principal activity
TransAlta Generation PartnershipCanada100  Generation and sale of electricity
TransAlta Cogeneration, L.P.Canada50.01  Generation and sale of electricity
TransAlta Centralia Generation, LLCUS100  Generation and sale of electricity
TransAlta Energy Marketing Corp.Canada100  Energy marketing
TransAlta Energy Marketing (U.S.), Inc.US100  Energy marketing
TransAlta Energy (Australia), Pty Ltd.Australia100  Generation and sale of electricity
TransAlta RenewablesCanada60.4  Generation and sale of electricity
Transactions between the Corporation and its subsidiaries have been eliminated on consolidation and are not disclosed.
Transactions with Key Management Personnel 
TransAlta’s key management personnel include the President and CEO and members of the senior management team that report directly to the President and CEO, and the members of the Board. Key management personnel compensation is as follows:
Year ended Dec. 31201920182017
Total compensation30  17  24  
Comprised of:   
  Short-term employee benefits13  11  14  
  Post-employment benefits   
  Termination benefits —  —  
  Share-based payments13