v3.26.1
Cover
 12 Months Ended
Dec. 31, 2025
shares
Entity Addresses [Line Items]  
Document Type 20-F
Amendment Flag false
Document Registration Statement false
Document Annual Report true
Document Transition Report false
Document Shell Company Report false
Document Period End Date Dec. 31, 2025
Document Fiscal Period Focus FY
Document Fiscal Year Focus 2025
Current Fiscal Year End Date --12-31
Entity File Number 001-39570
Entity Registrant Name TIM S.A.
Entity Central Index Key 0001826168
Entity Incorporation, State or Country Code D5
Entity Address, Address Line One João Cabral de Melo Neto Avenue, 850 – South Tower – 12th floor
Entity Address, City or Town Rio de Janeiro
Entity Address, Country BR
Entity Address, Postal Zip Code 22775-057
Title of 12(b) Security American Depositary Shares
Trading Symbol TIMB
Security Exchange Name NYSE
Entity Well-known Seasoned Issuer Yes
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Large Accelerated Filer
Entity Emerging Growth Company false
Document Accounting Standard International Financial Reporting Standards
Entity Shell Company false
Entity Common Stock, Shares Outstanding 2,392,125,889
ICFR Auditor Attestation Flag true
Document Financial Statement Error Correction Flag false
Auditor Firm ID 1448
Auditor Name Ernst & Young Auditores Independentes S/S Ltda.
Auditor Location Rio de Janeiro
Business Contact [Member]  
Entity Addresses [Line Items]  
Entity Address, Address Line One João Cabral de Melo Neto Avenue, 850 – South Tower – 12th floor
Entity Address, City or Town Rio de Janeiro
Entity Address, Country BR
Entity Address, Postal Zip Code 22775-057
City Area Code 55
Local Phone Number 4109-4167
Contact Personnel Name Vicente de Moraes Ferreira