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Cover
 12 Months Ended
Dec. 31, 2024
shares
Document Information [Line Items]  
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Document Period End Date Dec. 31, 2024
Current Fiscal Year End Date --12-31
Document Transition Report false
Document Shell Company Report false
Entity File Number 001-38763
Entity Registrant Name MILLICOM INTERNATIONAL CELLULAR SA
Entity Incorporation, State or Country Code N4
Entity Address, Address Line One 8400 NW 36th Street, Suite 530
Entity Address, City or Town Doral
Entity Address, State or Province FL
Entity Address, Postal Zip Code 33166
Entity Address, Country US
Title of 12(b) Security Common Shares, par value $1.50 per share
Trading Symbol TIGO
Security Exchange Name NASDAQ
Entity Common Stock, Shares Outstanding 172,096,305
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
ICFR Auditor Attestation Flag true
Document Financial Statement Error Correction [Flag] false
Document Accounting Standard International Financial Reporting Standards
Entity Shell Company false
Entity Central Index Key 0000912958
Amendment Flag false
Document Fiscal Year Focus 2024
Document Fiscal Period Focus FY
Business Contact  
Document Information [Line Items]  
Entity Address, Address Line One 8400 NW 36th Street, Suite 530
Entity Address, City or Town Doral
Entity Address, State or Province FL
Entity Address, Postal Zip Code 33166
Entity Address, Country US
Contact Personnel Name Bart Vanhaeren
City Area Code 305
Local Phone Number 302 4907
Contact Personnel Email Address investors@millicom.com