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Cover
 12 Months Ended
Dec. 31, 2022
shares
Entity Addresses [Line Items]  
Document Type 40-F
Document Registration Statement false
Document Annual Report true
Document Period End Date Dec. 31, 2022
Current Fiscal Year End Date --12-31
Entity File Number 001-15214
Entity Registrant Name TRANSALTA CORPORATION
Entity Incorporation, State or Country Code Z4
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
Annual Information Form true
Audited Annual Financial Statements true
Entity Common Stock, Shares Outstanding 268,290,896
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Emerging Growth Company false
ICFR Auditor Attestation Flag true
Amendment Flag false
Document Fiscal Year Focus 2022
Document Fiscal Period Focus FY
Entity Central Index Key 0001144800
Business Contact  
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