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Document and Entity Information
 12 Months Ended
Dec. 31, 2020
shares
Document And Entity Information [Abstract]  
Document Type 40-F
Document Period End Date Dec. 31, 2020
Amendment Flag false
Entity Registrant Name TransAlta Corporation
Entity Central Index Key 0001144800
Entity Current Reporting Status Yes
Current Fiscal Year End Date --12-31
Document Fiscal Year Focus 2020
Document Fiscal Period Focus FY
Entity Common Shares Outstanding 270,244,741
Entity Emerging Growth Company false
Entity Incorporation, State or Country Code A0
Annual Information Form true
Audited Annual Financial Statements true
Entity Interactive Data Current Yes
Entity Address, Address Line One 110-12th Avenue S.W., Box 1900, Station “M”
Entity Address, City or Town Calgary
Entity File Number 001-15214
Entity Address, State or Province AB
Entity Address, Postal Zip Code T2P 2M1
City Area Code 403
Local Phone Number 267-7110
Document Annual Report true
Document Registration Statement false
Entity Addresses [Line Items]  
Entity Address, Address Line One 110-12th Avenue S.W., Box 1900, Station “M”
Entity Address, City or Town Calgary
Entity Address, State or Province AB
Entity Address, Postal Zip Code T2P 2M1
City Area Code 403
Local Phone Number 267-7110
Business Contact  
Document And Entity Information [Abstract]  
Contact Personnel Name TransAlta Centralia Generation LLC
Entity Address, Address Line One 913 Big Hanaford Road
Entity Address, City or Town Centralia
Entity Address, State or Province WA
Entity Address, Postal Zip Code 98531
City Area Code 360
Local Phone Number 736-9901
Entity Addresses [Line Items]  
Contact Personnel Name TransAlta Centralia Generation LLC
Entity Address, Address Line One 913 Big Hanaford Road
Entity Address, City or Town Centralia
Entity Address, State or Province WA
Entity Address, Postal Zip Code 98531
City Area Code 360
Local Phone Number 736-9901