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Basis of Preparation of the Consolidated Financial Statements and Summary of Significant Accounting Policies and Practices - Summary of Retrospective Reclassification of Financial Statements (Detail) $ in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2018 MXN ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($)
Operating revenues: |  |  |  |
Revenues services |  |  | $ 878,411,323 | $ 831,885,365
Revenue from rendering of service | $ 863,647,642 | $ 43,878 | 878,411,323 | 831,885,365
Previous IFRS [member] |  |  |  |
Operating revenues: |  |  |  |
Mobile voice services |  |  | 221,751,600 | 242,302,380
Fixed voice services |  |  | 89,856,743 | 95,299,154
Mobile data services |  |  | 308,526,994 | 256,936,895
Fixed data services |  |  | 139,277,613 | 126,278,206
Pay television |  |  | 86,882,606 | 78,268,778
Other related services |  |  | 32,115,767 | 32,799,952
Revenue from rendering of service | $ 881,530,167 |  | 878,411,323 | 831,885,365
Retrospective reclassification [member] |  |  |  |
Operating revenues: |  |  |  |
Mobile voice services |  |  | (221,751,600) | (242,302,380)
Fixed voice services |  |  | (89,856,743) | (95,299,154)
Mobile data services |  |  | (308,526,994) | (256,936,895)
Fixed data services |  |  | (139,277,613) | (126,278,206)
Pay television |  |  | (86,882,606) | (78,268,778)
Other related services |  |  | (32,115,767) | (32,799,952)
Revenues services |  |  | $ 878,411,323 | $ 831,885,365

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