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Cover Page
shares in Millions
 12 Months Ended
Dec. 31, 2019
shares
Document Information [Line Items]  
Document Type 20-F
Amendment Flag false
Document Period End Date Dec. 31, 2019
Document Fiscal Year Focus 2019
Document Fiscal Period Focus FY
Document Annual Report true
Document Transition Report false
Document Shell Company Report false
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
Entity Emerging Growth Company false
Entity Shell Company false
Entity Voluntary Filers No
Entity Interactive Data Current Yes
Entity Address, Country MX
AA Shares [member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 20,602
A Shares [member]  
Document Information [Line Items]  
Trading Symbol AMOV
Security Exchange Name NYSE
Entity Common Stock, Shares Outstanding 531
Title of 12(b) Security A Shares, without par value
L Shares [member]  
Document Information [Line Items]  
Trading Symbol AMX
Security Exchange Name NYSE
Entity Common Stock, Shares Outstanding 44,872
Title of 12(b) Security L Shares, without par value
3.125% Senior Notes Due 2022 [Member]  
Document Information [Line Items]  
Trading Symbol AMX22
Security Exchange Name NYSE
Title of 12(b) Security 3.125% Senior Notes Due 2022
3.625% Senior Notes Due 2029 [Member]  
Document Information [Line Items]  
Trading Symbol AMX29
Security Exchange Name NYSE
Title of 12(b) Security 3.625% Senior Notes Due 2029
6.375% Notes Due 2035 [Member]  
Document Information [Line Items]  
Trading Symbol AMX35
Security Exchange Name NYSE
Title of 12(b) Security 6.375% Notes Due 2035
6.125% Notes Due 2037 [Member]  
Document Information [Line Items]  
Trading Symbol AMX37
Security Exchange Name NYSE
Title of 12(b) Security 6.125% Notes Due 2037
6.125% Senior Notes Due 2040 [Member]  
Document Information [Line Items]  
Trading Symbol AMX40
Security Exchange Name NYSE
Title of 12(b) Security 6.125% Senior Notes Due 2040
4.375% Senior Notes Due 2042 [Member]  
Document Information [Line Items]  
Trading Symbol AMX42
Security Exchange Name NYSE
Title of 12(b) Security 4.375% Senior Notes Due 2042
4.375% Senior Notes Due 2049 [Member]  
Document Information [Line Items]  
Trading Symbol AMX49
Security Exchange Name NYSE
Title of 12(b) Security 4.375% Senior Notes Due 2049