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Document and Entity Information
shares in Millions
 12 Months Ended
Dec. 31, 2017
shares
Document Information [Line Items]  
Document Type 20-F
Amendment Flag false
Document Period End Date Dec. 31, 2017
Document Fiscal Year Focus 2017
Document Fiscal Period Focus FY
Trading Symbol AMX
Entity Registrant Name AMERICA MOVIL SAB DE CV/
Entity Central Index Key 0001129137
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer Yes
Entity Current Reporting Status Yes
Entity Filer Category Large Accelerated Filer
AA Shares [member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 20,602
A Shares [member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 567
L Shares [member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 44,901