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Basis of Preparation of the Consolidated Financial Statements and Summary of Significant Accounting Policies and Practices (Tables) | 12 Months Ended
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Dec. 31, 2019
Text block [abstract] |
Summary of Reconciliation of Operating Lease Commitments to Lease liabilities | The lease liabilities as of January 1, 2019 can be reconciled to the operating lease commitments as of December 31, 2018, as follows:
Operating lease commitments as of December 31, 2018 |  |  | Ps. 137,949,821 |
Lease commitments not in scope of IFRS 16 |  |  | (29,624,063 | )
Lease payments not included in the operating lease commitments as at 31 December 2018, resulting from differences between IAS 17 and IFRS 16 at implementation date |  |  | 60,064,406 |
Short-term leases and leases of low-value assets |  |  | (5,498,423 | )
Effect of discounting |  |  | (43,504,081 | )
Lease liabilities as of January 1, 2019 |  |  | Ps. 119,387,660 |
Summary of Equity Interest in Most Significant Subsidiaries | The equity interest in the most significant subsidiaries at December 31, 2018 and 2019 is as follows:
Company name |  | Country |  |  | Equity interest at December 31 |
| 2018 |  |  | 2019 |
Subsidiaries: |  |  |  |  |  |  |  |  |  |  |  |
América Móvil B.V. a) |  |  | Netherlands |  |  |  | 100.0 | % |  |  | 100.0 | %
Compañía Dominicana de Teléfonos, S.A. (“Codetel”) b) |  |  | Dominican Republic |  |  |  | 100.0 | % |  |  | 100.0 | %
Sercotel, S.A. de C.V. a) |  |  | Mexico |  |  |  | 100.0 | % |  |  | 100.0 | %
Radiomóvil Dipsa, S.A. de C.V. and subsidiaries (“Telcel”) b) |  |  | Mexico |  |  |  | 100.0 | % |  |  | 100.0 | %
Puerto Rico Telephone Company, Inc. b) |  |  | Puerto Rico |  |  |  | 100.0 | % |  |  | 100.0 | %
Servicios de Comunicaciones de Honduras, S.A. de C.V. (“Sercom Honduras”) b) |  |  | Honduras |  |  |  | 100.0 | % |  |  | 100.0 | %
TracFone Wireless, Inc. (“TracFone”) b) |  |  | USA |  |  |  | 100.0 | % |  |  | 100.0 | %
Claro S.A. (Claro Brasil) b) |  |  | Brazil |  |  |  | 98.2 | % |  |  | 98.2 | %
NII Brazil Holding S.A.R.L a) |  |  | Luxembourg |  |  |  | — |  |  |  | 100.0 | %
Nextel Telecomunicações Ltda b) |  |  | Brazil |  |  |  | — |  |  |  | 100.0 | %
Telecomunicaciones de Guatemala, S.A. (“Telgua”) b) |  |  | Guatemala |  |  |  | 99.3 | % |  |  | 99.3 | %
Claro Guatemala, S.A. b) |  |  | Guatemala |  |  |  | — |  |  |  | 100 | %
Empresa Nicaragüense de Telecomunicaciones, S.A. (“Enitel”) b) |  |  | Nicaragua |  |  |  | 99.6 | % |  |  | 99.6 | %
Compañía de Telecomunicaciones de El Salvador, S.A. de C.V. (“CTE”) b) |  |  | El Salvador |  |  |  | 95.8 | % |  |  | 95.8 | %
Comunicación Celular, S.A. (“Comcel”) b) |  |  | Colombia |  |  |  | 99.4 | % |  |  | 99.4 | %
Telmex Colombia, S.A. |  |  | Colombia |  |  |  | 99.3 | % |  |  | — |
Consorcio Ecuatoriano de Telecomunicaciones, S.A. (“Conecel”) b) |  |  | Ecuador |  |  |  | 100.0 | % |  |  | 100.0 | %
AMX Argentina, S.A. b) |  |  | Argentina |  |  |  | 100.0 | % |  |  | 100.0 | %
AMX Paraguay, S.A. b) |  |  | Paraguay |  |  |  | 100.0 | % |  |  | 100.0 | %
AM Wireless Uruguay, S.A. b) |  |  | Uruguay |  |  |  | 100.0 | % |  |  | 100.0 | %
Claro Chile, S.A. b) |  |  | Chile |  |  |  | 100.0 | % |  |  | 100.0 | %
América Móvil Perú, S.A.C b) |  |  | Peru |  |  |  | 100.0 | % |  |  | 100.0 | %
Claro Panamá, S.A. b) |  |  | Panamá |  |  |  | 100.0 | % |  |  | 100.0 | %
Teléfonos de México, S.A.B. de C.V. b) |  |  | Mexico |  |  |  | 98.8 | % |  |  | 98.8 | %
Telekom Austria AG b) |  |  | Austria |  |  |  | 51.0 | % |  |  | 51.0 | %
a) | Holding companies
b) | Operating companies of mobile and fixed services
Summary of Annual Depreciation Rates | Annual depreciation rates are as follows:
Network infrastructure |  |  | 5 | %-33%
Buildings and leasehold improvement |  |  | 2 | %-33%
Other assets |  |  | 10 | %-50%
Summary of Most Significant Forward Looking Estimates Used for Impairment Evaluations | The most significant forward-looking estimates used for the 2018 and 2019 impairment evaluations are shown below:
|  | Average margin on EBIDTA |  | Average margin on CAPEX |  | Average pre-tax discount rate (WACC)
2018: |  |  |  |  |  |
Europe (7 countries) |  | 22.13% - 41.51% |  | 8.13% - 19.40% |  | 8.36% - 22.08%
Brazil (fixed line, wireless and TV) |  | 36.43% |  | 21.88% |  | 10.38%
Puerto Rico |  | 23.86% |  | 9.89% |  | 4.81%
Dominican Republic |  | 48.64% |  | 18.43% |  | 17.66%
Mexico (fixed line and wireless) |  | 36.33% |  | 7.93% |  | 16.30%
Ecuador |  | 39.83% |  | 11.26% |  | 24.45%
Peru |  | 30.29% |  | 19.95% |  | 11.52%
El Salvador |  | 45.36% |  | 22.61% |  | 18.01%
Chile |  | 25.91% |  | 14.99% |  | 6.62%
Colombia |  | 45.01% |  | 17.14% |  | 20.29%
Other countries |  | 7.90% - 45.91% |  | 0.61% - 23.96% |  | 9.97% - 31.63%
|  | Average margin on EBIDTA |  |  | Average margin on CAPEX |  |  | Average pre-tax discount rate (WACC) |
2019: |  |  |  |  |  |  |  |  |  |  |  |
Europe (7 countries) |  |  | 29.40% - 44.50% |  |  |  | 10.90% - 19.30% |  |  |  | 5.77% - 14.96% |
Brazil (fixed line, wireless and TV) |  |  | 40.43% |  |  |  | 23.50% |  |  |  | 11.00% |
Puerto Rico |  |  | 21.94% |  |  |  | 17.94% |  |  |  | 4.39% |
Dominican Republic |  |  | 47.23% |  |  |  | 16.17% |  |  |  | 13.84% |
Mexico (fixed line and wireless) |  |  | 38.81% |  |  |  | 9.84% |  |  |  | 11.85% |
Ecuador |  |  | 44.98% |  |  |  | 11.65% |  |  |  | 19.85% |
Peru |  |  | 32.51% |  |  |  | 18.51% |  |  |  | 8.86% |
El Salvador |  |  | 44.04% |  |  |  | 25.03% |  |  |  | 16.05% |
Chile |  |  | 26.85% |  |  |  | 18.00% |  |  |  | 4.16% |
Colombia |  |  | 45.58% |  |  |  | 19.25% |  |  |  | 17.27% |
Other countries |  |  | 7.40% - 52.40% |  |  |  | 0.57% - 31.0% |  |  |  | 6.41% - 34.75% |
Summary of quantitative information about right-of-use assets | Right-of-use assets are depreciated on a straight-line basis over the shorter of the lease term and the estimated useful lives of the assets, as follows:
Assets |  | Useful life
Towers and sites |  | 5 to 12 years
Property |  | 10 to 25 years
Other equipment |  | 5 to 15 years
Summary of Exchange Rates Used forTranslation of Foreign Currencies | The exchange rates used for the translation of foreign currencies against the Mexican peso are as follows:
|  |  |  | Average exchange rate |  |  | Closing exchange rate at December 31, |
Country or Zone |  | Currency |  | 2017 |  |  | 2018 |  |  | 2019 |  |  | 2018 |  |  | 2019 |
Argentina (1) |  | Argentine Peso (AR$) |  |  | 1.1489 |  |  |  | 0.7311 |  |  |  | 0.4110 |  |  |  | 0.5221 |  |  |  | 0.3147 |
Brazil |  | Real (R$) |  |  | 5.9346 |  |  |  | 5.2937 |  |  |  | 4.8907 |  |  |  | 5.0797 |  |  |  | 4.6754 |
Colombia |  | Colombian Peso (COP$) |  |  | 0.0064 |  |  |  | 0.0065 |  |  |  | 0.0059 |  |  |  | 0.0061 |  |  |  | 0.0058 |
Guatemala |  | Quetzal |  |  | 2.5755 |  |  |  | 2.5591 |  |  |  | 2.5023 |  |  |  | 2.5440 |  |  |  | 2.4478 |
U.S.A. (2) |  | US Dollar |  |  | 18.9400 |  |  |  | 19.2397 |  |  |  | 19.2641 |  |  |  | 19.6829 |  |  |  | 18.8452 |
Uruguay |  | Uruguay Peso |  |  | 0.6606 |  |  |  | 0.6274 |  |  |  | 0.5479 |  |  |  | 0.6074 |  |  |  | 0.5051 |
Nicaragua |  | Cordoba |  |  | 0.6307 |  |  |  | 0.6097 |  |  |  | 0.5817 |  |  |  | 0.6088 |  |  |  | 0.5569 |
Honduras |  | Lempira |  |  | 0.8007 |  |  |  | 0.7994 |  |  |  | 0.7806 |  |  |  | 0.8031 |  |  |  | 0.7597 |
Chile |  | Chilean Peso |  |  | 0.0292 |  |  |  | 0.0300 |  |  |  | 0.0275 |  |  |  | 0.0283 |  |  |  | 0.0252 |
Paraguay |  | Guaraní |  |  | 0.0034 |  |  |  | 0.0034 |  |  |  | 0.0031 |  |  |  | 0.0033 |  |  |  | 0.0029 |
Peru |  | Sol (PEN$) |  |  | 5.8054 |  |  |  | 5.8517 |  |  |  | 5.7708 |  |  |  | 5.8406 |  |  |  | 5.6814 |
Dominican Republic |  | Dominican Peso |  |  | 0.3983 |  |  |  | 0.3876 |  |  |  | 0.3737 |  |  |  | 0.3898 |  |  |  | 0.3542 |
Costa Rica |  | Colon |  |  | 0.0331 |  |  |  | 0.0332 |  |  |  | 0.0326 |  |  |  | 0.0322 |  |  |  | 0.0327 |
European Union |  | Euro |  |  | 21.3649 |  |  |  | 22.7101 |  |  |  | 21.5642 |  |  |  | 22.5586 |  |  |  | 21.1311 |
Bulgaria |  | Lev |  |  | 10.9223 |  |  |  | 11.6110 |  |  |  | 11.0257 |  |  |  | 11.5327 |  |  |  | 10.8076 |
Belarus |  | New Belarusian Ruble |  |  | 9.8087 |  |  |  | 9.4451 |  |  |  | 9.2159 |  |  |  | 9.1319 |  |  |  | 8.9420 |
Croatia |  | Croatian Kuna |  |  | 2.8619 |  |  |  | 3.0613 |  |  |  | 2.9069 |  |  |  | 3.0435 |  |  |  | 2.8406 |
Macedonia |  | Macedonian Denar |  |  | 0.3471 |  |  |  | 0.3688 |  |  |  | 0.3504 |  |  |  | 0.3667 |  |  |  | 0.3431 |
Serbia |  | Serbian Denar |  |  | 0.1762 |  |  |  | 0.1920 |  |  |  | 0.1830 |  |  |  | 0.1907 |  |  |  | 0.1795 |
(1) | Year-end rates are used for the translation of revenues and expenses if IAS 29 “Financial Reporting in Hyperinflationary Economies” is applied.
| Financial reporting in hyperinflationary economies
| Financial statements of Argentina subsidiaries are restated before translation to the reporting currency of the Company and before consolidation in order to reflect the same value of money for all items. Items recognized in the statements of financial position which are not measured at the applicable year-end measuring unit are restated based on the general price index. All non-monetary items measured at cost or amortized cost is restated for the changes in the general price index from the date of transaction or the last hyperinflationary calculation to the reporting date. Monetary items are not restated. All items of shareholders’ equity are restated for the changes in the general price index since their addition or the last hyperinflationary calculation until the end of the reporting period. All items of comprehensive income are restated for the change in a general price index from the date of initial recognition to the reporting date. Gains and losses resulting from the net-position of monetary items are reported in the consolidated statements of operations in financial result in exchange differences. In accordance with IFRS, prior year financial statements were not restated.
(2) | Includes U.S.A., Ecuador, El Salvador, Puerto Rico and Panama.

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