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Cover
 12 Months Ended
Dec. 31, 2022
shares
Document Information [Line Items]  
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Document Period End Date Dec. 31, 2022
Current Fiscal Year End Date --12-31
Document Transition Report false
Document Shell Company Report false
Entity File Number 001-38763
Entity Incorporation, State or Country Code N4
Entity Address, Address Line One 2, Rue du Fort Bourbon
Entity Address, Postal Zip Code -1249
Entity Address, City or Town Luxembourg
Entity Address, Country LU
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 Accounting Standard International Financial Reporting Standards
Entity Shell Company false
Entity Registrant Name MILLICOM INTERNATIONAL CELLULAR SA
Entity Central Index Key 0000912958
Amendment Flag false
Document Fiscal Year Focus 2022
Document Fiscal Period Focus FY
Business Contact  
Document Information [Line Items]  
Contact Personnel Name Mauricio Ramos
Entity Address, Address Line One 2, Rue du Fort Bourbon
Entity Address, Postal Zip Code -1249
Entity Address, City or Town Luxembourg
Entity Address, Country LU
City Area Code 352
Local Phone Number 277-59018; +1 786 628 5270; +1 786 628 5303
Contact Personnel Email Address investors@millicom.com