América Móvil, S.A.B. de C.V. (AMX) 20-F 29 Apr 21 2020 FY Annual report (foreign) Financial data

Cover Page

Cover Page shares in Millions	12 Months Ended
	Dec. 31, 2020shares
Document Information [Line Items]
Document Type	20-F
Amendment Flag	false
Document Period End Date	Dec. 31, 2020
Document Fiscal Year Focus	2020
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
ICFR Auditor Attestation Flag	false
Document Accounting Standard	International Financial Reporting Standards
AA Shares [member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding	20,578
A Shares [member]
Document Information [Line Items]
Trading Symbol	AMOV
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding	520
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	45,764
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
2.875% Senior Notes Due 2030 [Member]
Document Information [Line Items]
Trading Symbol	AMX30
Security Exchange Name	NYSE
Title of 12(b) Security	2.875% Senior Notes Due 2030
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

Consolidated Statements of Fina

Consolidated Statements of Financial Position $ in Thousands, $ in Millions	Dec. 31, 2020MXN ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019MXN ($)
Current assets:
Cash and cash equivalents	$ 35,917,907	$ 1,801	$ 19,745,656
Equity investments at fair value through other comprehensive income (OCI) and other short-term investments	54,636,395	2,739	47,718,025
Accounts receivable:
Subscribers, distributors, recoverable taxes, contract assets and other, net	207,977,954	10,426	204,706,296
Related parties	1,391,300	70	1,273,140
Derivative financial instruments	20,928,335	1,049	6,825,760
Inventories, net	30,377,439	1,523	41,102,012
Other current assets, net	8,993,907	451	9,473,434
Total current assets	360,223,237	18,059	330,844,323
Non-current assets:
Property, plant and equipment, net	722,929,631	36,239	639,343,370
Intangibles, net	133,456,967	6,690	125,169,389
Goodwill	143,052,859	7,171	152,899,801
Investments in associated companies	1,829,760	92	2,474,193
Deferred income taxes	115,370,240	5,783	106,167,897
Accounts receivable, subscriber, distributors and contract assets, net	7,792,863	391	15,139,442
Other assets, net	38,415,826	1,926	41,892,019
Right-of-use assets	101,976,844	5,112	118,003,223
Total assets	1,625,048,227	81,463	1,531,933,657
Current liabilities:
Short-term debt and current portion of long-term debt	148,083,184	7,423	129,172,033
Short-term liability related to right-of-use of assets	25,067,905	1,257	25,894,711
Accounts payable	186,995,472	9,374	216,112,824
Accrued liabilities	50,291,851	2,521	52,371,252
Income tax	14,644,979	734	33,026,606
Other taxes payable	27,969,739	1,402	24,373,400
Derivative financial instruments	14,230,249	713	9,596,751
Related parties	3,999,916	201	3,460,419
Deferred revenues	36,027,383	1,806	31,391,749
Total current liabilities	507,310,678	25,431	525,399,745
Non-current-liabilities:
Long-term debt	480,299,772	24,077	495,082,444
Long-term liability related to right-of-use of assets	84,259,336	4,224	94,702,022
Deferred income taxes	49,067,163	2,460	18,093,041
Deferred revenues	2,875,467	144	3,425,738
Asset retirement obligations	17,887,991	897	15,816,744
Employee benefits	168,230,202	8,433	152,507,058
Total non-current liabilities	802,619,931	40,235	779,627,047
Total liabilities	1,309,930,609	65,666	1,305,026,792
Equity:
Capital stock	96,341,695	4,829	96,338,262
Retained earnings:
Prior years	267,865,420	13,428	213,719,236
Profit for the year	46,852,605	2,349	67,730,891
Total retained earnings	314,718,025	15,777	281,450,127
Other comprehensive loss items	(160,580,917)	(8,049)	(199,878,430)
Equity attributable to equity holders of the parent	250,478,803	12,557	177,909,959
Non-controlling interests	64,638,815	3,240	48,996,906
Total equity	315,117,618	15,797	226,906,865
Total liabilities and equity	$ 1,625,048,227	$ 81,463	$ 1,531,933,657

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income $ in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2020MXN ($)$ / shares	Dec. 31, 2020USD ($)$ / shares	Dec. 31, 2019MXN ($)$ / shares	Dec. 31, 2018MXN ($)$ / shares
Operating revenues:
Service revenues	$ 857,860,234	$ 43,003	$ 834,365,232	$ 863,647,642
Sales of equipment	159,026,296	7,972	172,982,637	174,560,039
Operating revenues	1,016,886,530	50,975	1,007,347,869	1,038,207,681
Operating costs and expenses:
Cost of sales and services	470,427,476	23,582	471,736,157	508,822,430
Commercial, administrative and general expenses	212,135,830	10,634	215,993,865	227,192,478
Other expenses	4,724,630	237	5,862,102	6,923,022
Depreciation and amortization	164,243,683	8,233	158,915,210	155,712,580
Operating costs and expenses	851,531,619	42,686	852,507,334	898,650,510
Operating income	165,354,911	8,289	154,840,535	139,557,171
Interest income	5,062,036	254	6,284,672	10,646,169
Interest expense	(38,661,740)	(1,938)	(37,911,339)	(31,771,433)
Foreign currency exchange (loss) gain, net	(65,366,200)	(3,277)	5,226,071	(7,261,956)
Valuation of derivatives, interest cost from labor obligations and other financial items, net	1,291,108	65	(7,075,342)	(10,176,316)
Equity interest in net result of associated companies	(287,006)	(14)	(17,609)	267
Profit before income tax	67,393,109	3,379	121,346,988	100,993,902
Income tax	16,366,152	820	51,033,533	46,477,079
Net profit for the year	51,026,957	2,559	70,313,455	54,516,823
Net profit for the year attributable to:
Equity holders of the parent	46,852,605	2,349	67,730,891	52,566,197
Non-controlling interests	4,174,352	210	2,582,564	1,950,626
Net profit for the year	$ 51,026,957	$ 2,559	$ 70,313,455	$ 54,516,823
Basic and diluted earnings per share attributable to equity holders of the parent | (per share)	$ 0.71	$ 0.04	$ 1.03	$ 0.79
Net other comprehensive loss that may be reclassified to profit or loss in subsequent years:
Effect of translation of foreign entities	$ (11,515,297)	$ (579)	$ (35,536,252)	$ (64,314,032)
Items that will not be reclassified to (loss) or profit in subsequent years:
Re-measurement of defined benefit plan, net of deferred taxes	(10,299,558)	(516)	(29,535,672)	757,278
Unrealized (loss) gain on equity investments at fair value, net of deferred taxes	(1,952,414)	(98)	883,408	(3,765,688)
Revaluation surplus, net of deferred taxes	77,230,031	3,871
Total other comprehensive (loss) income items for the year, net of deferred taxes	53,462,762	2,678	(64,188,516)	(67,322,442)
Total comprehensive (loss) income for the year	104,489,719	5,237	6,124,939	(12,805,619)
Comprehensive (loss) income for the year attributable to:
Equity holders of the parent	86,150,118	4,319	5,450,679	(11,770,227)
Non-controlling interests	18,339,601	918	674,260	(1,035,392)
Total comprehensive (loss) income for the year	$ 104,489,719	$ 5,237	$ 6,124,939	$ (12,805,619)

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity $ in Thousands, $ in Millions	MXN ($)	USD ($)	Capital stock [member]MXN ($)	Legal reserve [member]MXN ($)	Retained earnings [member]MXN ($)	Unrealized (loss) gain on equity investment at fair value [member]MXN ($)	Re-measurements of defined benefit plans [member]MXN ($)	Cumulative translation adjustment [member]MXN ($)	Revaluation surplus [member]MXN ($)	Total equity attributable to equity holders of the parent [member]MXN ($)	Non- controlling interests [member]MXN ($)
Beginning balance (Effect of adoption of new accounting standards [member]) at Dec. 31, 2017	$ 20,116,789				$ 19,598,349					$ 19,598,349	$ 518,440
Beginning balance (Restated balance [member]) at Dec. 31, 2017	280,750,306		$ 96,338,508	$ 358,440	190,327,507	$ (6,047,296)	$ (75,080,656)	$ 7,866,158		213,762,661	66,987,645
Beginning balance at Dec. 31, 2017	260,633,517		96,338,508	358,440	170,729,158	(6,047,296)	(75,080,656)	7,866,158		194,164,312	66,469,205
Net profit for the year	54,516,823				52,566,197					52,566,197	1,950,626
Unrealized gain (loss) on equity investments at fair value, net of deferred taxes	(3,765,688)					(3,765,688)				(3,765,688)
Remeasurement of defined benefit plan, net of deferred taxes	757,278						652,722			652,722	104,556
Effect of translation of foreign entities	(64,314,032)							(61,223,458)		(61,223,458)	(3,090,574)
Total comprehensive (loss) income for the year	(12,805,619)				52,566,197	(3,765,688)	652,722	(61,223,458)		(11,770,227)	(1,035,392)
Dividends declared	(22,984,982)				(21,134,520)					(21,134,520)	(1,850,462)
Hyperinflation adjustment	15,826,934				15,826,934					15,826,934
Repurchase of shares	(518,763)		(130)		(518,633)					(518,763)
Redemption of hybrid bond	(13,440,120)										(13,440,120)
Other acquisitions of non-controlling interests	(955,334)				(170,440)					(170,440)	(784,894)
Ending balance at Dec. 31, 2018	245,872,422		96,338,378	358,440	236,897,045	(9,812,984)	(74,427,934)	(53,357,300)		195,995,645	49,876,777
Net profit for the year	70,313,455				67,730,891					67,730,891	2,582,564
Unrealized gain (loss) on equity investments at fair value, net of deferred taxes	883,408					883,408				883,408
Remeasurement of defined benefit plan, net of deferred taxes	(29,535,672)						(29,153,554)			(29,153,554)	(382,118)
Effect of translation of foreign entities	(35,536,252)							(34,010,066)		(34,010,066)	(1,526,186)
Total comprehensive (loss) income for the year	6,124,939				67,730,891	883,408	(29,153,554)	(34,010,066)		5,450,679	674,260
Dividends declared	(24,580,113)				(23,106,823)					(23,106,823)	(1,473,290)
Repurchase of shares	(427,328)		(116)		(427,212)					(427,328)
Other acquisitions of non-controlling interests	(83,055)				(2,214)					(2,214)	(80,841)
Ending balance at Dec. 31, 2019	226,906,865		96,338,262	358,440	281,091,687	(8,929,576)	(103,581,488)	(87,367,366)		177,909,959	48,996,906
Net profit for the year	51,026,957				46,852,605					46,852,605	4,174,352
Unrealized gain (loss) on equity investments at fair value, net of deferred taxes	(1,952,414)	$ (98)				(1,952,414)				(1,952,414)
Remeasurement of defined benefit plan, net of deferred taxes	(10,299,558)	(516)					(10,026,454)			(10,026,454)	(273,104)
Effect of translation of foreign entities	(11,515,297)							(13,558,774)		(13,558,774)	2,043,477
Revaluation surplus, net of deferred taxes	77,230,031								$ 64,835,155	64,835,155	12,394,876
Total comprehensive (loss) income for the year	104,489,719	5,237			46,852,605	(1,952,414)	(10,026,454)	(13,558,774)	64,835,155	86,150,118	18,339,601
Dividends declared	(27,021,864)				(25,161,564)					(25,161,564)	(1,860,300)
Stock dividend	17,058,657		4,650		17,054,007					17,058,657
Repurchase of shares	(5,211,097)		(1,217)		(5,209,880)					(5,211,097)
Other acquisitions of non-controlling interests	(1,104,662)				(267,270)					(267,270)	(837,392)
Ending balance at Dec. 31, 2020	$ 315,117,618	$ 15,797	$ 96,341,695	$ 358,440	$ 314,359,585	$ (10,881,990)	$ (113,607,942)	$ (100,926,140)	$ 64,835,155	$ 250,478,803	$ 64,638,815

Consolidated Statements of Cash

Consolidated Statements of Cash Flows $ in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2020MXN ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)
Operating activities
Profit before income tax	$ 67,393,109	$ 3,379	$ 121,346,988	$ 100,993,902
Items not requiring the use of cash:
Depreciation property, plant and equipment and right-of-use assets	143,691,770	7,203	138,386,952	129,115,727
Amortization of intangible and other assets	20,551,913	1,030	20,528,258	26,596,853
Equity interest in net (loss) income of associated companies	287,006	14	17,609	(267)
Loss on sale of property, plant and equipment	257,330	13	119,272	664,777
Net period cost of labor obligations	18,085,954	907	16,609,565	13,989,100
Foreign currency exchange loss (income), net	59,923,928	3,005	(7,250,635)	6,148,612
Interest income	(5,062,036)	(254)	(6,284,672)	(10,646,169)
Interest expense	38,661,740	1,938	37,911,339	31,771,433
Employee profit sharing	2,066,066	105	1,618,695	1,500,342
Loss in valuation of derivative financial instruments, capitalized interest expense and other, net	(13,678,083)	(686)	(9,202,167)	(7,518,445)
Gain on net monetary positions	(3,262,512)	(164)	(4,267,194)	(4,429,145)
Working capital changes:
Subscribers, distributors, recoverable taxes, contract assets and other, net	3,129,237	157	6,800,942	(15,420,291)
Prepaid expenses	20,925	1	9,079,931	3,264,685
Related parties	421,337	21	476,671	38,426
Inventories	11,618,280	582	(2,095,622)	(3,232,136)
Other assets	(2,613,460)	(131)	(6,597,262)	(6,081,740)
Employee benefits	(18,795,532)	(942)	(20,224,276)	(14,235,549)
Accounts payable and accrued liabilities	11,531,391	578	(16,811,135)	23,997,632
Employee profit sharing paid	(2,436,223)	(122)	(2,187,316)	(1,013,799)
Financial instruments and other	2,606,938	131	(1,774,932)	5,286,290
Deferred revenues	3,198,018	160	(636,221)	38,243
Interest received	3,946,110	198	1,008,076	1,215,800
Income taxes paid	(60,715,663)	(3,044)	(42,294,398)	(33,713,753)
Net cash flows provided by operating activities	280,827,543	14,079	234,278,468	248,330,528
Investing activities
Purchase of property, plant and equipment	(108,907,418)	(5,459)	(132,884,335)	(143,888,033)
Acquisition of intangibles	(20,647,571)	(1,035)	(18,962,856)	(7,933,647)
Dividends received	2,122,826	106	1,773,336	2,622,237
Proceeds from sale of plant, property and equipment	162,060	8	344,924	178,532
Acquisition of businesses, net of cash acquired	(152,896)	(8)	(13,330,651)	(310,604)
Partial sale of shares of associated company	601,509	30	36,478	548,484
Investments in associate companies	(64,341)	(3)	(56,985)
Short-term disinvestments	(8,671,662)	(435)
Net cash flows used in investing activities	(135,557,493)	(6,796)	(163,080,089)	(148,783,031)
Financing activities
Loans obtained	277,515,598	13,911	118,082,256	155,263,221
Repayment of loans	(330,607,399)	(16,573)	(109,808,816)	(189,314,144)
Payment of liability related to right-of-use of assets	(29,623,565)	(1,485)	(26,765,075)
Interest paid	(28,421,734)	(1,425)	(28,046,695)	(30,869,017)
Repurchase of shares	(5,076,119)	(254)	(435,713)	(511,421)
Dividends paid	(9,592,253)	(481)	(24,248,145)	(22,369,793)
Redemption of hybrid bond				(13,440,120)
Acquisition of non-controlling interests	(1,104,662)	(55)	(83,055)	(115,821)
Net cash flows used in financing activities	(126,910,134)	(6,362)	(71,305,243)	(101,357,095)
Net increase (decrease) in cash and cash equivalents	18,359,916	921	(106,864)	(1,809,598)
Adjustment to cash flows due to exchange rate fluctuations, net	(2,187,665)	(110)	(1,807,442)	(800,913)
Cash and cash equivalents at beginning of the year	19,745,656	990	21,659,962	24,270,473
Cash and cash equivalents at end of the year	35,917,907	1,801	19,745,656	21,659,962
Non-cash transactions related to:
Acquisitions of property, plant and equipment in accounts payable at end year	3,063,081	154	19,673,706	19,099,066
Redemption of exchangeable bond				16,446,262
Revaluation surplus	107,152,628
Non-cash transactions	$ 110,215,709	$ 5,525	$ 19,673,706	$ 35,545,328

Description of the Business and

Description of the Business and Relevant Events	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Description of the Business and Relevant Events	1. Description of the Business and Relevant Events I. Corporate Information América Móvil, S.A.B. de C.V. and subsidiaries (hereinafter, the “Company”, “América Móvil” or “AMX”) was incorporated under laws of Mexico on September 25, 2000. The Company provides telecommunications services in 25 countries throughout Latin America, the United States, the Caribbean and Europe. These telecommunications services include mobile and fixed-line voice services, wireless and fixed data services, internet access and Pay TV, over the top and other related services. The Company also sells equipment, accessories and computers. • Voice services provided by the Company, both wireless and fixed, mainly include the following: airtime, local, domestic and international long-distance services, and network interconnection services. • Data services include value added, corporate networks, data and Internet services. • Pay TV represents basic services, as well as pay per view and additional programming and advertising services. • AMX provides other related services to advertising in telephone directories, publishing and call center services. • The Company also provides video, audio and other media content that is delivered through the internet directly from the content provider to the end user. In order to provide these services, América Móvil has licenses, permits and concessions (collectively referred to herein as “licenses”) to build, install, operate and exploit public and/or private telecommunications networks and provide miscellaneous telecommunications services (mostly mobile and fixed voice and data services) and to operate frequency bands in the radio-electric spectrum for point-to-point point-to-multipoint Certain licenses require the payment to the respective governments of a share in sales determined as a percentage of revenues from services under concession. The percentage is set as either a fixed rate or in some cases based on certain size of the infrastructure in operation. The corporate offices of América Móvil are located in Mexico City, Mexico, at Lago Zurich 245, Colonia Ampliación Granada, Delegación Miguel Hidalgo, 11529, Mexico City, Mexico. The accompanying consolidated financial statements were approved for their issuance by the Company’s Chief Financial Officer on April 26, 2021, and subsequent events have been considered through that date. II. Relevant events in 2020 a) The Covid-19 is an infectious disease caused by a new virus, was declared a world-wide pandemic by the World Heald Organization (“WHO”) on March 11, 2020. The measures to slow the spread of Covid-19 have had a significant impact on the global economy. Given the evolving nature of Covid-19 and the limited recent experience of the economic and financial impacts of such a pandemic, Companies around the world have had to assess the changes and effects in their financial information. These changes and effects have not presented significant challenges for the Company in the valuation, presentation and disclosure of its financial statement consolidated as of December 31, 2020, considering that the telecommunications industry has been one of the least affected by the pandemic. As part of the actions taken, the Company has evaluated the impact, mainly on the estimates related to the measurement assets and liabilities that may arise in the future, without identifying significant changes in the assumptions used. b) During the COVID-19 c) In September 2020 the Company announced an agreement with Verizon Communications Inc. to sell the 100% interest in TracFone Wireless, Inc., the largest mobile virtual prepaid service operator in the United States, serving 21 million subscribers. The agreed purchase price payment at the closing is US$6,250 million, of which one-half earn-out 6-month

Basis of Preparation of the Con

Basis of Preparation of the Consolidated Financial Statements and Summary of Significant Accounting Policies and Practices	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Basis of Preparation of the Consolidated Financial Statements and Summary of Significant Accounting Policies and Practices	2. Basis of Preparation of the Consolidated Financial Statements and Summary of Significant Accounting Policies and Practices a) Basis of preparation The accompanying consolidated financial statements have been prepared in conformity with International Financial Reporting Standards, as issued by the International Accounting Standards Board (“IASB”) (hereafter referred to as IFRS). The consolidated financial statements have been prepared on the historical cost basis, except for the derivative financial instruments, the mobile telecommunications towers, the trust assets of post-employment and other employee benefit plans and the investments in equity at fair value through other comprehensive income (OCI), which are presented at their market value. Effective July 1, 2018, the Argentinian economy has been considered to be hyperinflationary in accordance with the criteria in IAS 29 “Financial Reporting in Hyperinflationary Economies” (“IAS 29”). Accordingly, for the Argentinian subsidiaries, we have included, adjustments for hyperinflation and reclassifications as is required by the standard for purposes of presentation of IFRS in the consolidated financial statements. The preparation of these consolidated financial statements under IFRS requires the use of critical estimates and assumptions that affect the amounts reported for certain assets, liabilities, income and expenses, including the main impact generated by the COVID-19 The Mexican peso is the functional currency of the Company’s Mexican operations and the consolidated reporting currency of the Company. i) Changes in Accounting Policies and Disclosures Amendments to IFRS 16 Covid-19 On 28 May 2020, the IASB issued Covid-19-Related Covid-19 Covid-19 Covid-19 The amendment applies to annual reporting periods beginning on or after 1 June 2020. Earlier application is permitted. This amendment had no significant impact on the consolidated financial statements of the Company (See Note 15). Revaluation of telecommunications towers (plant, property and equipment) As of December 31, 2020, the company changed its accounting policy to record the value of the passive infrastructure (towers) of its subsidiaries. With the change, this passive infrastructure was no longer recognized at historical cost and it began to be recognized under the revaluation model (market value). The company considers that the revaluation model represents the actual conditions of the industry of this class of assets and improves its financial position, this allows its shareholders and stakeholders to have the necessary financial information associated with market expectations about this class of assets. The incremental effect on passive infrastructure is Ps.107,152,628. The first time application of an asset revaluation policy is a change in accounting policy that must be treated as a revaluation in accordance with IAS 16, this implies that it is not necessary to restructure the book value of previous periods, therefore, the adoption of this method will be carried out prospectively. ii) Basis of consolidation The consolidated financial statements include the accounts of América Móvil, S.A.B. de C.V. and those subsidiaries over which the Company exercises control. The consolidated financial statements for the subsidiaries were prepared for the same period as the Company´s and applying consistent accounting policies. All of the subsidiary companies operate in the telecommunications sector or related. Subsidiaries are entities over which the Company has control. Control is achieved when the Company has power over the investee, when it is exposed to, or has rights to, variable returns from its involvement with the investee, and has the ability to use its power over the investee to affect the amount of the investor’s returns. Subsidiaries are consolidated on a line by line basis from the date which control is achieved by the Company. The Company reassesses whether or not it controls an investee if facts and circumstances indicate that there are changes to one or more of the elements of control. On March 6, 2020, in accordance with a resolution of the Federal Telecommunications Institute (Instituto Federal de Telecomunicaciones or IFT), the subsidiaries Teléfonos de México, S.A.B. de C.V. and Teléfonos del Noroeste, S.A. de C.V. created separate companies related to the wholesale services named Red Nacional Última Milla S.A.P.I. de C.V., Servicios de Telecomunicaciones Ultima Milla, S.A. de C.V. and Red Última Milla del Noroeste S.A.P.I. de C.V. The restructuring of Telmex has no impact in the consolidated financial information of the Company. Changes in the Company’s ownership interests in a subsidiary that do not result in the Company losing control over the subsidiary are accounted for as equity transactions. The carrying amounts of the equity attributable to owners of the parent and non-controlling non-controlling Subsidiaries are deconsolidated from the date which control ceases. When the Company ceases to have control over a subsidiary, it derecognizes the assets (including any goodwill) and liabilities of the subsidiary at their carrying amounts, derecognizes the carrying amount of non-controlling All intra-Company balances and transactions, and any unrealized gains and losses arising from intra-Company transactions, are eliminated in preparing the consolidated financial statements. Non-controlling Non-controlling Associates: An associate is an entity over which the Company has significant influence. Significant influence is the power to participate in the financial and operating policy decisions of the investee but does not have control or joint control over those decisions. The Company’s investment in associates includes goodwill identified on acquisition, net of any accumulated impairment losses. The investments in associated companies in which the Company exercises significant influence are accounted for using the equity method, whereby Company recognizes its share in the net profit (losses) and equity of the associate. The results of operations of the subsidiaries and associates are included in the Company’s consolidated financial statements beginning as of the month following their acquisition and its share of other comprehensive income after acquisition is recognized directly in other comprehensive income. The Company assesses at each reporting date whether there is objective evidence that investment in associates is impaired. If so, the Company calculates the amount of impairment as the difference between the recoverable amount of the associate and its carrying value. The equity interest in the most significant subsidiaries at December 31, 2019 and 2020 is as follows: Company name Country Equity interest at December 31 2019 2020 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 % 100.0 % Nextel Telecomunicações Ltda b) Brazil 100.0 % 100.0 % Telecomunicaciones de Guatemala, S.A. (“Telgua”) b) Guatemala 99.3 % 99.3 % Claro Guatemala, S.A. b) Guatemala 100.0 % 100.0 % Empresa Nicaragüense de Telecomunicaciones, S.A. (“Enitel”) b) Nicaragua 99.6 % 99.6 % Compañía de Telecomunicaciones de El Salvador, S.A. de C.V. b) El Salvador 95.8 % 95.8 % Comunicación Celular, S.A. (“Comcel”) b) Colombia 99.4 % 99.4 % 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 iii) Basis of translation of financial statements of foreign subsidiaries and associated companies The operating revenues of foreign subsidiaries jointly represent approximately 73%, 71% and 72% of consolidated operating revenues for the years ended December 31, 2018, 2019 and 2020, respectively, and their total assets jointly represent approximately 73% and 75% of consolidated total assets at December 31, 2019 and 2020, respectively. The financial statements of foreign subsidiaries have been prepared under or converted to IFRS in the respective local currency (which is their functional currency) and then translated into the Company’s reporting currency as follows: • all monetary assets and liabilities were translated at the closing exchange rate of the period; • all non-monetary • equity accounts are translated at the exchange rate at the time the capital contributions were made and the profits were generated; • revenues, costs and expenses are translated at the average exchange rate of the period, except for the operations of the subsidiaries in Argentina, whose economy is considered hyperinflationary since 2018; • the consolidated statements of cash flows presented using the indirect method were translated using the weighted-average exchange rate for the applicable period (except for Argentina), and the resulting difference is shown in the consolidated statements of cash flows under the heading “Adjustment to cash flows due to exchange rate fluctuations, net”. The basis of translation for the operations of the subsidiaries in Argentina are described: In recent years, the Argentina economy has shown high rates of inflation. Although inflation data has not been consistent in recent years and several indexes have coexisted, inflation in Argentina indicates that the three-year cumulative inflation rate exceeded 100% in 2018, which is one of the quantitative references established by IAS 29. As a result, Argentina was considered a hyperinflationary economy in 2018 and the Company applies hyperinflation accounting to its subsidiary whose functional currency is the Argentine peso for financial information for periods ending on or after July 1, 2018, however the calculation of the cumulative impact was measured as of January 1, 2018. In order to restate for hyperinflation its financial statements, the subsidiary used the series of indices defined by resolution JG No. 539/18 issued by the “Federación Argentina de Consejos Profesionales de Ciencias Económicas” (“FACPCE”), based on the National Consumer Price Index (IPC) published by the Instituto Nacional de Estadística y Censos (INDEC) of the Argentine Republic and the Wholesale Internal Price Index (IPIM) published by FACPCE. The cumulative index at December 31, 2020 is 385.8826, while on an annual inflation for 2020 is 36.1%. The main implications are as follows: • Adjustment of the historical cost of non-monetary • The gain on the net monetary position caused by the impact of inflation in the year is included in the consolidated statements of comprehensive income as part of the caption “ Valuation of derivatives, interest cost from labor obligations and other financial items, net” • All items in the financial statements of the Argentine company are translated at the closing exchange rate, which at December 31, 2019 and 2020 were 0.3147 and 0.2371, respectively, per argentine peso per Mexican peso. The difference resulting from the translation process is recognized in equity in the caption “Effect of translation of foreign entities”. At December 31, 2019 and 2020, the cumulative translation adjustment was Ps.(87,367,366) and Ps.(100,926,140), respectively. b) Revenue recognition The Company revenues are derived principally from providing the following telecommunications services and products: wireless voice, wireless data and value-added services, fixed voice, fixed data, broadband and IT services, Pay TV and over-the-top (“OTT”) services. The Company provides fixed and mobile services. These services are offered independently in contracts with customers or together with the sale of handsets (mobile) under the postpaid model. In accordance with IFRS 15 “ Revenues from contracts with customers ” , the transaction price should be assigned to the different performance obligations based on their relative standalone selling price. The Company with respect to the provided services, it has market observable information, to determine the standalone selling price of the services. On the other hand, in the case of the sale of bundled mobile phones sold (including service and handset) by the Company, the allocation of the sales is done based on their relative standalone selling price of each individual component related to the total bundled price. The result is that more equipment revenue is recognized at the moment of a sale and, therefore, less service revenue from the monthly fee are being recognized under IFRS 15. The services provided by the Company are satisfied over the time of the contract period, given that the customer simultaneously receives and consumes the benefits provided by the Company. Such service bundles, voice and data, accomplish the criteria mentioned in IFRS 15 of being substantially similar and of having the same transfer pattern which is why the Company concluded that the revenue from these different services offered to its customers are considered as a single performance obligation with revenue being recognized over time, except for sales of equipment. Under IFRS 15, for tho s The commissions are considered incremental contract acquisition costs that are capitalized and are amortized over the expected period of benefit, during the average duration of customer contracts. Some subsidiaries have loyalty programs where the Company awards credits customer credit awards referred as “points”. The customer can redeem accrued “points” for awards such as devices, accessories or airtime. The Company provides all awards. The consideration allocated to the award credits is identified as a separate performance obligation; the corresponding liability of the award credits is measured at its fair value. The consideration allocated to award credits amount is recognized as a contract liability until the points are redeemed. Revenue is recognized upon redemption of products by the customer. c) Cost of sales The cost of mobile equipment and computers is recognized at the time the client and distributor receive the device which is when the control is are transferred to the customer. d) Cost of services The cost of services represents the costs incurred to properly deliver the services to the customers, it includes the network operating costs and licenses related costs and is accounted at the moment in which such services are provided. e) Commissions to distributors The Company pays commissions to its distributors different than those that acquire customers. Such commissions are recognized in “commercial, administrative and general expenses” f) Cash and cash equivalents Cash and cash equivalents represent bank deposits and liquid investments with maturities of less than three months. These amounts are stated at cost plus accrued interest, which is similar to their market value. The Company also maintains restricted cash held as collateral to meet certain contractual obligations. Restricted cash is presented as part of “Other assets” within other non-current . g) Equity investments at fair value through OCI and other short-term investments Equity investments at fair value through OCI and other short-term investments are primarily composed of equity investments and other short-term financial investments. Amounts are initially recorded at their estimated fair value. Fair value adjustments for equity investments are recorded through other comprehensive income, and other short-term investment. h) Inventories Inventories are initially recognized at historical cost and are valued using the average cost method without exceeding their net realizable value. The estimate of the realizable value of inventories on-hand is based on their age and turnover. i) Business combinations and goodwill Business combinations are accounted for using the acquisition method, which in accordance with IFRS 3, “ Business acquisitions (i) Identify the acquirer (ii) Determine the acquisition date (iii) Value the acquired identifiable assets and assumed liabilities (iv) Recognize the goodwill or a bargain purchase gain For acquired subsidiaries, goodwill represents the difference between the purchase price and the fair value of the net assets acquired at the acquisition date. The investment in acquired associates includes goodwill identified on acquisition, net of any impairment loss. Goodwill is reviewed annually to determine its recoverability or more often if circumstances indicate that the carrying value of the goodwill might not be fully recoverable. The possible loss of value in goodwill is determined by analyzing the recovery value of the cash generating unit (or the group thereof) to which the goodwill is associated at the time it was originated. If this recoverable amount is lower than the carrying value, an impairment loss is charged to the results of operations. The recoverable amount is determined based on the higher of fair value less cost of disposal or value in use. For the years ended December 31, 2018, 2019 and 2020, no impairment losses were recognized for goodwill. j) Property, plant and equipment i) Property, plant and equipment are recorded at acquisition cost, net of accumulated depreciation; except for the passive infrastructure of telecommunications towers, which are recognized under the revaluation model as of December 31, 2020. Depreciation is computed on the cost of assets using the straight line method, based on the estimated useful lives of the related assets, beginning the month after they become available for use. Borrowing costs that are incurred for general financing for construction in progress for periods exceeding six months are capitalized as part of the cost of the asset. During the years ended December 31, 2018, 2019 and 2020, borrowing costs that were capitalized amounted to Ps.2,020,288, Ps.2,233,358 and Ps.1,771,613, respectively. In addition to the purchase price and costs directly attributable to preparing an asset in terms of its physical location and condition for operating as intended by management, when required, the cost also includes the estimated costs of dismantling and removal of the asset and for restoration of the site where it is located (See Note 16c). The passive infrastructure of telecommunications towers will be recorded at revalued value, which is its fair value at the time of revaluation less accumulated depreciation; if there is any loss or impairment, it must also be considered within its value. The revaluations will be calculated with sufficient regularity to ensure that the book value, every time, does not differ significantly from that which could be determined using the fair value at the end of the reporting period. The increase resulting from a revaluation is recorded in other comprehensive income (OCI) and is accumulated in equity as a revaluation surplus. To the extent that there is a decrease in revaluation, it will be recognized in profit or loss, except to the extent that it compensates for an existing surplus on the same asset. An annual transfer of the asset revaluation surplus and accumulated earnings is made to the extent that the asset is used, therefore, the surplus is equal to the difference between the depreciation calculated on the revalued value and the one calculated according to its original cost. These transfers do not record in the results for the period. A total transfer of the surplus may be made when the entity disposes of the asset. ii) The net book value of property, plant and equipment is removed from the consolidated statements of financial position at the time the asset is sold or when no future economic benefits are expected from its use or sale. Any gains or losses on the sale of property, plant and equipment represent the difference between net proceeds of the sale and the net book value of the item at the time of sale. These gains or losses are recognized as either other operating income or other operating expenses upon sale. iii) The Company periodically assesses the residual values, useful lives and depreciation methods associated with its property, plant and equipment. If necessary, the effects of any changes in accounting estimates is recognized prospectively, at the closing of each period, in accordance with IAS 8, “ Accounting Policies, Changes in Accounting Estimates and Errors For property, plant and equipment made up of several components with different useful lives, the major individual components are depreciated over their individual useful lives. Maintenance costs and repairs are expensed as incurred. Annual depreciation rates are as follows: Network infrastructure 5%-33% Buildings and leasehold improvement 2%-33% Other assets 10%-50% iv) The carrying value of property, plant and equipment is reviewed if there are indicators of impairment in such assets. If an asset’s recovery value is less than the asset’s net carrying value, the difference is recognized as an impairment loss. During the years ended December 31, 2018, 2019 and 2020, no impairment losses were recognized. v) Spare parts for network operation are recognized at cost. The valuation of inventory for network considered obsolete, defective or slow-moving, is reduced to their estimated net realizable value. The estimate of the recovery value of inventories is based on their age and turnover. k) Intangibles i) Licenses Licenses to operate wireless telecommunications networks granted by the governments of the countries in which the Company operates are recorded at acquisition cost or at fair value at their acquisition date, net of accumulated amortization. Certain licenses require payments to the governments, such payments are recognized in the cost of service and equipment. The licenses that in accordance with government requirements are categorized as automatically renewable, for a nominal cost and with substantially consistent terms, are considered by the Company as intangible assets with an indefinite useful life. Accordingly, they are not amortized. Licenses are amortized when the Company does not have a basis to conclude that they are indefinite lived. Licenses are amortized using the straight-line method over a period ranging from 3 to 30 years, which represents the usage period of the assets. The Company has conducted an internal analysis on the applicability of the International Financial Reporting Interpretation Committee (“IFRIC”) No. 12 (Service Concession Agreements) and has concluded that its concessions are outside the scope of IFRIC 12. To determine the applicability of IFRIC 12, the Company analyzes each concession or group of similar concessions in a given jurisdiction. As a threshold matter, the Company identifies those government concessions that provide for the development, financing, operation or maintenance of infrastructure used to render a public service, and that set out performance standards, mechanisms for adjusting prices and arrangements for arbitrating disputes. With respect to those services, the Company evaluates whether the grantor controls or regulates (i) what services the operator must provide, (ii) to whom it must provide them and (iii) the applicable price (the “Services Criterion”). In evaluating whether the applicable government, as grantor, controls the price at which the Company provides its services, the Company looks at the terms of the concession agreement according to all applicable regulations. If the Company determines that the concession under analysis meets the Services Criterion, then the Company evaluates whether the grantor would hold a significant residual interest in the concession’s infrastructure at the end of the term of the arrangement. ii) Trademarks Trademarks acquired are measured on initial recognition at cost. The cost of trademarks acquired in a business combination is their fair value at the date of acquisition. The useful lives of trademarks are assessed as either definite or indefinite. Trademarks with finite useful lives are amortized using the straight-line method over a period ranging from 1 to 10 years. Trademarks with indefinite useful lives are not amortized but are tested for impairment annually at the cash generating unit level. The assessment of indefinite life is reviewed annually to determine whether the indefinite life continues to be supportable, if not, the change in useful life from indefinite to definite is made on a prospective basis. iii) Irrevocable rights of use Irrevocable rights of use are recognized according to the amount paid for the right and are amortized over the period in which they are granted. The carrying values of the Company’s licenses and trademarks are reviewed annually and whenever there are indicators of impairment in the value of such assets. When an asset’s recoverable amount, which is the higher of the asset’s fair value, less disposal costs and its value in use (the present value of future cash flows), is less than the asset’s carrying value, the difference is recognized as an impairment loss. iv) Customer relationships The value of customer relations is determined and valued at the time that a new subsidiary is acquired, as determined by the Company with the assistance of independent appraisers and is amortized over a 5-year During the years ended December 31, 2018, 2019 and 2020, no significant impairment losses were recognized for licenses, trademarks, irrevocable rights of use or customer relationships. l) Impairment in the value of long-lived assets The Company assesses the existence of indicators of impairment in the carrying value of long-lived assets, investments in associates, goodwill and intangible assets according to IAS 36 “ Impairment of assets ”. When there are such indicators, or in the case of assets whose nature requires an annual impairment analysis (goodwill and intangible assets with indefinite useful lives), the Company estimates the recoverable amount of the asset, which is the higher of its fair value, less disposal costs, and its value in use. Value in use is determined by discounting estimated future cash flows, applying a pre-tax discount rate that reflects the time value of money and taking into consideration the specific risks associated with the asset. When the recoverable amount of an asset is below its carrying value, impairment is considered to exist. In this case, the carrying value of the asset is reduced to the asset’s recoverable amount, recognizing the loss in results of operations for the respective period. Depreciation and/or amortization expense of future periods is adjusted based on the new carrying value determined for the asset over the asset’s remaining useful life. Impairment is computed individually for each asset. Recoverable amount is determined for an individual asset, unless the asset does not generate cash inflows that are largely independent of those from other assets or group of assets. In the estimation of impairments, the Company uses the strategic plans established for the separate cash-generating units to which the assets are assigned. Such strategic plans generally cover a period from 3 to 5 years. For longer periods, beginning in the fifth year, projections are based on such strategic plans while applying a constant or declining expected perpetual growth rate. Key assumptions used in value in use calculations The forecasts are made in real terms (net of inflation) and in the functional currency of the subsidiary as of December 31, 2020. Financial forecasts, premises and assumptions are similar to what any other market participant in similar conditions would consider, including impacts from the COVID-19 pandemic. Local synergies, that any other market participant would not have taken into consideration to prepare similar forecasted financial information, have not been included. The assumptions used to develop the financial forecasts were validated for each of the cash generating units (“CGUs”), typically identified by country and by service (in the case of Mexico) taking into consideration the following: • Current subscribers and expected growth. • Type of subscribers (prepaid, postpaid, fixed line, multiple services) • Market environment and penetration expectations • New products and services • Economic environment of each country • Expenses for maintaining the current assets • Investments in technology for expanding the current assets • Market consolidation and synergies The foregoing forecasts cou l The recoverable amounts are based on value in use. The value in use is determined based on the method of discounted cash flows. The key assumptions used in projecting cash flows are: • Margin on EBITDA is determined by dividing EBITDA (operating income plus depreciation and amortization) by total revenues. • Margin on CAPEX is determined by dividing capital expendi t • Pre-tax weighted average cost of capital (“WACC”) is used to discount the projected cash flows. As discount rate, the Company uses the WACC which was determined for each of the cash generating units and is described in the following paragraphs. The estimated discount rates to perform the IAS 36 “ Impairment of assets The discount rates represent the current market assessment of the risks specific to each CGU, taking into consideration the time value of money and individual risks of the underlying assets that have not been incorporated in the cash flow estimates. The discount rate calculation is based on the specific circumstances of the Company and its operating segments. The WACC takes into account both debt and equity costs. The cost of equity is derived from the expected return on investment for each GCU. The cost of debt is based on the interest-bearing borrowings the Company is obliged to service. Segment-specific risk is incorporated by applying individual beta factors. The beta factors are evaluated annually based on publicly available market data. Market participant assumptions are important because, not only do they include industry data for growth rates, but also management assesses how the CGU’s position, relative to its competitors, might change over the forecasted period. The most significant forward-looking estimates used for the 2019 and 2020 impairment evaluations are shown below: 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% 6.94% 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% 2020: Europe (7 countries) 32.20% - 40.76% 7.04% - 19.39% 3.88% - 12.02% Brazil (fixed line, wireless and TV) 40.67% 25.36% 9.50% Puerto Rico 23.06% 14.57% 3.53% Dominican Republic 47.57% 13.71% 8.27% Mexico (fixed line and wireless) 32.69% 11.01% 6.03% Ecuador 49.23% 11.14% 17.50% Peru 38.72% 15.43% 4.76% El Salvador 45.92% 21.19% 14.63% Chile 26.34% 13.18% 3.37% Colombia 43.45% 18.19% 6.44% Other countries 10.07% - 47.23% 0.48% - 31.67% 3.42% - 21.85% Sensitivity to changes in assumptions: The implications of the key assumptions for the recoverable amount are discussed below: Margin on CAPEX- The Company performed a sensitivity analysis by increasing its CAPEX by 5% and maintaining all other assumptions the same. The sensitivity analysis would require the Company to adjust the amount of its long-lived assets in its CGUs with potential impairment of approximately Ps.62,548. WACC- Additionally, should the Company increase by 50 base points in WACC per CGU and maintain all other assumptions the same, results without impairment. m) Right-of-use The Company applies a single recognition and measurement approach for all leases, except for short-term leases and leases of low-value right-o

Cash and Cash Equivalents

Cash and Cash Equivalents	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Cash and Cash Equivalents	3. Cash and Cash Equivalents Cash and cash equivalents are comprised of short-term deposits with different financial institutions. Cash equivalents only include instruments with purchased maturity of less than three months. The amount includes the amount deposited, plus any interest earned.

Equity investments at fair valu

Equity investments at fair value through OCI and other short-term investments	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Equity investments at fair value through OCI and other short-term investments	4. Equity investments at fair value through OCI and other short-term investments As of December 31, 2019 and 2020, equity investments at fair value through OCI and other short-term investments includes an equity investment in KPN for Ps.37,572,410 and Ps.50,033,111, respectively, and other short-term investments for Ps.10,145,615 and Ps.4,603,284, respectively, which represents a cash deposit used to guarantee a short-term obligation for one of the Company’s foreign subsidiaries and are presented at their carrying value, which approximates fair value. The investment in KPN is carried at fair value with changes in fair value being recognized through other comprehensive (loss) gain items (equity) in the Company’s consolidated statements of financial position. As of December 31, 2019 and 2020, the Company has recognized in equity changes in fair value of the investment of Ps.883,408 and Ps.(1,952,414), respectively, net of deferred taxes, through other comprehensive (loss) gain items in equity. During the years ended December 31, 2018, 2019 and 2020, the Company received dividends from KPN for an amount of Ps.2,605,333, Ps.1,742,242 and Ps.2,119,668, respectively; which are included within “Valuation of derivatives, interest cost from labor obligations, and other financial items, net”

Accounts receivable from subscr

Accounts receivable from subscribers, distributors, recoverable taxes contractual assets and other, net	12 Months Ended
	Dec. 31, 2020
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Accounts receivable from subscribers, distributors, recoverable taxes contractual assets and other, net	5. Accounts receivable from subscribers, distributors, recoverable taxes contractual assets and other, net a) At December 31, 2019 2020 Subscribers and distributors Ps.184,260,099 Ps. 168,758,386 Telecommunications carriers for network interconnection and other services 5,079,763 4,914,094 Recoverable taxes 23,628,728 44,557,402 Sundry debtors 12,084,050 12,504,566 Contract assets 34,274,007 29,588,104 Impairment of trade receivables (39,480,909 ) (44,551,735 ) Total net Ps.219,845,738 Ps. 215,770,817 Non-current Ps. 15,139,442 Ps. 7,792,863 Total current subscribers, distributors and contractual assets Ps.204,706,296 Ps. 207,977,954 b) Changes in the impairment of trade receivables is as follows: For the years ended December 31, 2018 2019 2020 Balance at beginning of year Ps.(39,044,925 ) Ps.(40,798,025 ) Ps.(39,480,909 ) Increases recorded in expenses (19,535,707 ) (16,346,395 ) (19,112,635 ) Adjustment on initial application of IFRS 9 (2,400,783 ) — — Write-offs 15,497,254 17,839,957 11,953,227 Business combination (3,265,490 ) (2,066 ) Translation effect 4,686,136 3,089,044 2,090,648 Balance at end of year Ps.(40,798,025 ) Ps.(39,480,909 ) Ps.(44,551,735 ) c) The following table shows the aging of accounts receivable at December 31, 2019 and 2020, for subscribers and distributors: Past due Total Unbilled services provided a-30 days 31-60 days 61-90 days Greater than 90 days December 31, 2019 Ps. 184,260,099 Ps. 76,223,243 Ps. 46,083,644 Ps. 6,076,281 Ps. 4,121,929 Ps. 51,755,002 December 31, 2020 Ps. 168,758,386 Ps. 75,972,811 Ps. 37,439,995 Ps. 5,325,264 Ps. 3,313,835 Ps. 46,706,481 d) The following table shows the accounts receivable from subscribers and distributors included in the impairments of trade receivables, as of December 31, 2019 and 202 0 : Total 1-90 days Greater than 90 days December 31, 2019 Ps. 39,480,909 Ps. 3,948,091 Ps. 35,532,818 December 31, 2020 Ps. 44,551,735 Ps. 4,455,174 Ps. 40,096,561 e) An analysis of contract assets and liabilities at December 31, 2019 and 2020 is as follows: 2019 2020 Contract Assets: Balance at the beginning of the year Ps. 34,718,749 Ps. 34,274,007 Additions 34,877,851 27,242,031 Disposals (2,658,641 ) (1,397,714 ) Business Combination 576,463 — Amortization (30,501,315 ) (29,002,995 ) Translation effect (2,739,100 ) (1,527,225 ) Balance at the end of the year Ps. 34,274,007 Ps. 29,588,104 Non-current Ps. 1,786,560 Ps. 817,740 Current portion contracts assets Ps. 32,487,447 Ps. 28,770,364

Related Parties

Related Parties	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Related Parties	6. Related Parties a) The following is an analysis of the balances with related parties as of December 31, 2019 and 2020. All of the companies were considered affiliates of América Móvil since the Company’s principal shareholders are either direct or indirect shareholders in the related parties. 2019 2020 Accounts receivable: Hubard y Bourlon, S.A. de C.V. Ps. 172,952 Ps. 437,231 Patrimonial Inbursa, S.A. 386,194 327,985 Sears Roebuck de México, S.A. de C.V. and Subsidiaries. 228,523 233,402 Sanborns Hermanos, S.A. 229,964 160,116 Claroshop.com, S.A.P.I de C.V. 91,874 100,075 Grupo Condumex, S.A. de C.V. and Subsidiaries 12,018 10,038 Carso Infraestructura y Construcción, S.A. de C.V. and Subsidiaries 41,204 7,679 Other 110,411 114,774 Total Ps.1,273,140 Ps.1,391,300 2019 2020 Accounts payable: Carso Infraestructura y Construcción, S.A. de C.V. and Subsidiaries Ps.1,656,123 Ps.2,192,405 Grupo Condumex, S.A. de C.V. and Subsidiaries 905,776 1,054,526 Fianzas Guardiana Inbursa, S.A. de C.V. 241,305 241,898 Grupo Financiero Inbursa, S.A.B. de C.V. 246,804 234,954 Seguros Inbursa, S.A. de C.V. 100,155 92,173 PC Industrial, S.A. de C.V. and Subsidiaries 68,189 44,198 Enesa, S.A. de C.V. and Subsidiaries 25,076 22,014 Other 216,991 117,748 Total Ps.3,460,419 Ps.3,999,916 For the years ended December 31, 2018, 2019 and 2020, th e b) For the years ended December 31, 2018, 2019 and 2020, the Company conducted the following transactions with relate d parties: 2018 2019 2020 Investments and expenses: Construction services, purchases of materials, inventories and property, plant and equipment (i) Ps. 7,211,960 Ps. 8,573,894 Ps. 7,130,769 Insurance premiums, fees paid for administrative and operating services, brokerage services and others (ii) 4,134,380 4,590,620 4,375,113 Rent of towers (iii) 6,168,592 — — Other services 1,864,017 1,277,404 1,101,528 Ps. 19,378,949 Ps. 14,441,918 Ps. 12,607,410 Revenues: Service revenues Ps. 679,220 Ps. 538,110 Ps. 608,248 Sales of equipment 1,296,204 944,697 656,801 Ps. 1,975,424 Ps. 1,482,807 Ps. 1,265,049 i) In 2020, this amount includes Ps.5,312,845 (Ps.6,809,244 in 2019 and Ps.5,622,791 in 2018) for network construction services and construction materials purchased from subsidiaries of Grupo Carso, S.A.B. de C.V. (Grupo Carso). ii) In 2020, this amount includes Ps.203,013 (Ps.956,132 in 2019 and Ps.778,191 in 2018) for network maintenance services performed by Grupo Carso subsidiaries; Ps.13,490 in 2020 (Ps.16,161 in 2019, and Ps.13,784 in 2018) for software services provided by an associate; Ps.2,713,370 in 2020 (Ps.2,623,795 in 2019 and Ps.2,541,703 in 2018) for insurance premiums with Seguros Inbursa S.A. and Fianzas Guardiana Inbursa, S.A., which, in turn, places most of such insurance with reinsurers. iii) Due to the implementation of IFRS 16 amounts related to payments for tower leases are no longer considered rental expenses. c) The aggregate compensation paid to the Company’s, directors (including compensation paid to members of the Audit and Corporate Practices Committee), and senior management in 2020 was approximately Ps.6,300 and Ps.79,600, respectively. None of the Company’s directors is a party to any contract with the Company or any of its subsidiaries that provides for benefits upon termination of employment. The Company does not provide pension, retirement or similar benefits to its directors in their capacity as directors. The Company’s executive officers are eligible for retirement and severance benefits required by Mexican law on the same terms as all other employees. d) Österreichische Bundes- und Industriebeteiligungen GmbH (ÖBIB) is considered a related party due to it is a significant non-controlling shareholder in Telekom Austria. Through Telekom Austria, América Móvil is related to the Republic of Austria and its subsidiaries, which are mainly ÖBB Group, ASFINAG Group and Post Group as well as Rundfunk und Telekom Reguliegungs-GmbH, all of which these are related parties. In 2018, 2019 and 2020, none of the individual transactions associated with government agencies or government-owned entities of Austria were considered significant to América Móvil.

Derivative Financial Instrument

Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Derivative Financial Instruments	7. Derivative Financial Instruments To mitigate the risks of future increases in interest rates and foreign exchange rates for the servicing of its debt, the Company has entered into derivative contracts in over-the-counter At December 31, 2019 2020 Instrument Notional amount in Fair Value Notional amount in millions Fair Value Assets: Swaps US Dollar-Mexican peso US$ 3,290 Ps. 4,420,433 US$ 3,490 Ps.16,806,937 Swaps US Dollar – Euro US$ 150 96,967 US$ 150 117,726 Swaps Yen-US ¥ 6,500 262,993 ¥ 9,750 269,215 Swaps Pound sterling – US Dollar £ 100 2,988 £ 1,010 2,237,919 Forwards US Dollar – Mexican Peso US$ 100 18 US$ 240 39,607 Forwards US Dollar-Brazilian US$ 83 90,429 — — Forwards Brazilian Real-US Dollar BRL 5,803 1,620,605 BRL$ 4,193 1,190,292 Forwards Euro-Brazilian € 50 4,255 — — Forwards Euro-US € 1,506 204,241 € 915 266,639 Forwards Argentinean Peso – US Dollar ARS$ 1,388 122,831 — — Total Assets Ps.6,825,760 Ps.20,928,335 At December 31, 2019 2020 Instrument Notional amount in Fair Value Notional amount in millions Fair Value Liabilities: Swaps US Dollar-Mexican peso US$ 200 Ps. (33,253 ) — Ps. — Swaps US Dollar-Euro US$ 800 (2,228,287 ) US$ 800 (4,811,031 ) Swaps Yen-US — — ¥ 3,250 (14,802 ) Swaps Pound sterling-Euro £ 640 (2,201,997 ) £ 640 (3,122,492 ) Swap Pound sterling-US £ 2,010 (3,019,255 ) £ 550 (457,559 ) Forwards US Dollar-Mexican Peso US$ 2,343 (1,398,247 ) US$ 3,494 (4,052,852 ) Forwards Brazilian Real-US — — BRL$ 1,762 (425,249 ) Forwards Euro – Mexican Peso — — € 200 (272,274 ) Forwards Euro-US Dollar € 1,094 (554,278 ) — — Forwards US Dollar – Euro US$ 20 (3,787 ) — — Forwards Euro – Brazilian Real € 140 (10,196 ) — — Forwards Yen – US Dollar ¥ 6,500 (18,769 ) — — Put option € 374 (126,569 ) € 374 (1,073,990 ) Call option € 3,000 (2,113 ) — — Total Liabilities Ps.(9,596,751 ) Ps.(14,230,249 ) The changes in the fair value of these derivative financial instruments for the years ended December 31, 2018, 2019 and 2020 amounted to a (loss) gain of Ps.(4,686,407), Ps.4,432,023 and Ps.12,378,193. Such amounts are included in the consolidated statements of comprehensive income as part of the caption “Valuation of derivatives interest cost from labor obligations and other financial items, net” . The maturities of the notional amount of the derivatives are as follow s : Instrument Notional amount in millions 2021 2022 2023 2024 2025 Thereafter Assets Swaps US Dollar-Mexican peso US$ 1,600 1,890 Swaps Yen-US Dollar ¥ 9,750 Swaps US Dollar – Euro US$ 150 Swaps Pound sterling – US Dollar £ 1,010 Forwards US Dollar-Mexican Peso US$ 240 Forwards Brazilian Real-US Dollar BRL 4,193 Forwards Euro-US Dollar € 915 Liabilities Swaps US Dollar-Euro US$ 800 Swaps Yen-US Dollar ¥ 3,250 Swaps Pound sterling-Euro £ 640 Swap Pound sterling-US Dollar £ 550 Forwards US Dollar – Mexican Peso US$ 3,494 Forwards Brazilian Real-US Dollar BRL 1,762 Forwards Euro – Mexican Peso € 200 Put option € 374

Inventories, net

Inventories, net	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Inventories, net	8. Inventories, net An analysis of inventories at December 31, 2019 and 2020 is as follows: 2019 2020 Mobile phones, accessories, computers, TVs, cards and other materials Ps.43,954,616 Ps.33,763,086 Less: Reserve for obsolete and slow-moving inventories (2,852,604 ) (3,385,647 ) Total Ps.41,102,012 Ps.30,377,439 For the years ended December 31, 2018, 2019 and 2020, the cost of inventories recognized in cost of sales was Ps.180,013,986, Ps.174,543,602 and Ps.167,546,288, respectively.

Other assets, net

Other assets, net	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Other assets, net	9. Other assets, net An analysis of other assets at December 31, 2019 and 2020 is as follows: 2019 2020 Current portion: Advances to suppliers (different from PP&E and inventories) Ps. 7,718,343 Ps. 7,600,644 Prepaid insurance 978,927 1,300,019 Other 776,164 93,244 Ps. 9,473,434 Ps. 8,993,907 Non-current Recoverable taxes Ps.14,647,726 Ps.11,559,961 Prepayments for the use of fiber optics 2,095,556 2,709,358 Judicial Deposits (1) 19,506,147 15,402,840 Prepaid expenses 5,642,590 8,743,667 Total Ps.41,892,019 Ps.38,415,826 For the years ended December 31, 2018, 2019 and 2020, amortization expense for other assets was Ps.798,243, Ps.318,824 and Ps.213,833, respectively. (1) Judicial deposits represent cash and cash equivalents pledged in order to fulfill the collateral requirements for tax contingencies mainly in Brazil. At December 31, 2019 and 2020, the amount for these deposits is Ps.19,506,147 and Ps.15,402,840, respectively for Brazil. Based on its evaluation of the underlying contingencies, the Company believes that such amounts are recoverable.

Property, Plant and Equipment,

Property, Plant and Equipment, Net	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Property, Plant and Equipment, Net	10. Property, Plant and Equipment, net a) At December 31, 2017 Additions Retirements Business combinations Effect of translation of foreign subsidiaries and hyperinflation adjustment Depreciation for the year At December 31, 2018 Cost Network in operation and equipment Ps. 989,665,946 Ps. 68,900,443 Ps. (1,610,246 ) Ps.128,246 Ps. (87,888,453 ) Ps. — Ps. 969,195,936 Land and buildings 62,584,189 4,429,433 (3,987,671 ) 8,874 (5,904,499 ) — 57,130,326 Other assets 150,315,807 25,268,252 (13,377,798 ) 2,578 (12,399,702 ) — 149,809,137 Construction in process and advances plant suppliers (1) 74,121,374 92,285,397 (76,978,798 ) 1,379 (8,336,823 ) — 81,092,529 Spare parts for operation of the network 26,591,598 49,380,349 (44,626,488 ) 1,939 (2,902,869 ) — 28,444,529 Total 1,303,278,914 240,263,874 (140,581,001 ) 143,016 (117,432,346 ) — 1,285,672,457 Accumulated depreciation Network in operation and equipment 552,345,509 — (28,712,096 ) — (67,907,227 ) 104,279,361 560,005,547 Buildings 10,655,285 — (2,311,442 ) — (2,157,996 ) 2,625,102 8,810,949 Other assets 63,359,529 — (2,418,837 ) — (6,579,983 ) 22,172,785 76,533,494 Spare parts for operation of the network 575,393 — (160,696 ) — (131,429 ) 38,479 321,747 Total Ps. 626,935,716 Ps. — Ps. (33,603,071 ) Ps. — Ps. (76,776,635 ) Ps. 129,115,727 Ps. 645,671,737 Net Cost Ps. 676,343,198 Ps. 240,263,874 Ps. (106,977,930 ) Ps.143,016 Ps. (40,655,711 ) Ps. (129,115,727 ) Ps. 640,000,720 At December 31, 2018 Additions Retirements Business combinations Effect of translation of foreign subsidiaries and hyperinflation adjustment Depreciation for the year At December 31, 2019 Cost Network in operation and equipment Ps. 969,195,936 Ps. 82,992,062 Ps. (13,417,360 ) Ps. 9,572,805 Ps.(57,669,840 ) Ps. — Ps. 990,673,603 Land and buildings 57,130,326 1,530,677 (4,025,222 ) 115,935 (3,950,463 ) — 50,801,253 Other assets 149,809,137 26,881,611 (7,594,735 ) 1,021,051 (7,776,500 ) — 162,340,564 Construction in process and advances plant suppliers (1) 81,092,529 82,640,305 (76,892,011 ) 209,790 (5,511,439 ) — 81,539,174 Spare parts for operation of the network 28,444,529 44,776,904 (36,525,735 ) — (2,462,605 ) — 34,233,093 Total 1,285,672,457 238,821,559 (138,455,063 ) 10,919,581 (77,370,847 ) — 1,319,587,687 Accumulated depreciation Network in operation and equipment 560,005,547 — (24,954,514 ) — (47,778,627 ) 93,097,695 580,370,101 Buildings 8,810,949 — (287,072 ) — (1,386,974 ) 2,330,405 9,467,308 Other assets 76,533,494 — (695,425 ) — (4,754,982 ) 19,249,104 90,332,191 Spare parts for operation of the network 321,747 — (283,986 ) — (79,226 ) 116,182 74,717 Total Ps. 645,671,737 Ps. — Ps. (26,220,997 ) Ps. — Ps.(53,999,809 ) Ps. 114,793,386 Ps. 680,244,317 Net Cost Ps. 640,000,720 Ps. 238,821,559 Ps. (112,234,066 ) Ps. 10,919,581 Ps.(23,371,038 ) Ps. (114,793,386 ) Ps. 639,343,370 At December 31, 2019 Additions Retirements Business combinations Revaluation Transfers Effect of translation of foreign subsidiaries and hyperinflation adjustment Depreciation for the year At December 31, 2020 Cost Network in operation and equipment Ps. 990,673,603 Ps. 90,387,449 Ps. (19,574,391 ) Ps. 996,974 Ps. 107,152,628 Ps. (62,050,212 ) Ps. (49,993,808 ) Ps. — Ps. 1,057,592,243 Land and buildings 50,801,253 570,062 (2,853,037 ) — — — 369,300 — 48,887,578 Other assets 162,340,564 17,474,218 (14,454,598 ) 55,848 — — (8,393,187 ) — 157,022,845 Construction in process and advances plant suppliers (1) 81,539,174 59,635,316 (68,661,847 ) 1,099 — — (5,011,829 ) — 67,501,913 Spare parts for operation of the network 34,233,093 30,721,413 (37,829,818 ) — — — (2,328,430 ) — 24,796,258 Total 1,319,587,687 198,788,458 (143,373,691 ) 1,053,921 107,152,628 (62,050,212 ) (65,357,954 ) — 1,355,800,837 Accumulated depreciation Network in operation and equipment 580,370,101 — (25,726,856 ) — — (62,050,212 ) (2) (58,055,450 ) 96,729,723 531,267,306 Buildings 9,467,308 — (1,663,796 ) — — — (622,253 ) 1,906,140 9,087,399 Other assets 90,332,191 — (9,317,821 ) — — — (5,120,175 ) 16,549,822 92,444,017 Spare parts for operation of the network 74,717 — (176,131 ) — — — 38,898 135,000 72,484 Total Ps. 680,244,317 Ps. — Ps. (36,884,604 ) Ps. — Ps. — Ps. (62,050,212 ) Ps. (63,758,980 ) Ps. 115,320,685 Ps. 632,871,206 Net Cost Ps. 639,343,370 Ps. 198,788,458 Ps. (106,489,087 ) Ps. 1,053,921 Ps. 107,152,628 Ps. — Ps. (1,598,974 ) Ps. (115,320,685 ) Ps. 722,929,631 (1) Construction in progress includes fixed and mobile network facilities as well as satellite developments and fiber optic which is in the process of being installed. (2) This transfer relates to the accumulated depreciation as at the revaluation date that was eliminated against the gross carrying amount of the revalued asset. The completion period of construction in progress is variable and depends upon the type of plant and equipment under construction. b) Revaluation of telecommunications towers The Fair value of the passive infrastructure of telecommunications towers was determined using the ”income approach” method through a discounted flow model (DFC) where, among others, inputs such as average rents per tower were used, contract term and discount rates considering market information. As of December 31, 2020, date of the revaluation, the fair values of the passive infrastructure of the telecommunications towers were determinated by a valuation specialist with experience in the industry. The complement for the revaluation of the passive infrastructure of the telecommunications towers amounted to Ps.107,152,628 and was recognized in OCI, the change in revaluation did not have an impact on the results of the year due to depreciation effects since the change occurred on effective date 31 December 2020. The information to be disclosed on the fair value measurement for the revalued telecommunications towers is provided in Note 19. 2020 Book value as of December 31, 2020 (cost model) Ps.615,777,003 Supplement for change in accounting policy 107,152,628 Book value and fair value as of December 31, 2020 (revaluation model) 722,929,631 c) Relevant information related to the computation of the capitalized borrowing costs is as follows: Year ended December 31, 2018 2019 2020 Amount invested in the acquisition of qualifying assets Ps. 45,456,630 Ps. 50,783,957 Ps. 46,528,232 Capitalized interest 2,020,288 2,233,358 1,771,613 Capitalization rate 4.4 % 4.4 % 3.8 % Capitalized interest is being amortized over a period of estimated useful life of the related assets.

Intangible assets, net and good

Intangible assets, net and goodwill	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Intangible assets, net and goodwill	11. Intangible assets, net and goodwill a) For the year ended December 31, 2018 Balance at Acquisitions Acquisitions Disposals and Amortization Effect of Balance at end Licenses and rights of use Ps. 247,413,824 Ps. 4,227,244 Ps. — Ps. 1,508,274 Ps. — Ps. (19,670,368 ) Ps. 233,478,974 Accumulated amortization (134,109,438 ) — — (1,005,877 ) (11,347,089 ) 16,281,825 (130,180,579 ) Net 113,304,386 4,227,244 — 502,397 (11,347,089 ) (3,388,543 ) 103,298,395 Trademarks 28,779,212 159,958 6,631 — — (738,635 ) 28,207,166 Accumulated amortization (18,841,405 ) — — — (4,973,602 ) 275,046 (23,539,961 ) Net 9,937,807 159,958 6,631 — (4,973,602 ) (463,589 ) 4,667,205 Customer relationships 26,985,714 74,637 15,556 — — (1,532,839 ) 25,543,068 Accumulated amortization (16,129,495 ) — — — (3,754,312 ) 1,122,270 (18,761,537 ) Net 10,856,219 74,637 15,556 — (3,754,312 ) (410,569 ) 6,781,531 Software licenses 15,055,598 2,004,550 3,006 (905,610 ) — (1,848,286 ) 14,309,258 Accumulated amortization (7,815,161 ) — — 2,677,848 (3,491,629 ) 924,139 (7,704,803 ) Net 7,240,437 2,004,550 3,006 1,772,238 (3,491,629 ) (924,147 ) 6,604,455 Content rights 6,717,442 850,779 — — — (18,512 ) 7,549,709 Accumulated amortization (4,516,665 ) — — — (2,231,978 ) (14,949 ) (6,763,592 ) Net 2,200,777 850,779 — — (2,231,978 ) (33,461 ) 786,117 Total of intangibles, net Ps. 143,539,626 Ps. 7,317,168 Ps. 25,193 Ps. 2,274,635 Ps. (25,798,610 ) Ps. (5,220,309 ) Ps. 122,137,703 Goodwill Ps. 151,463,232 Ps. — Ps. 334,739 Ps. (1,094,861 ) — Ps. (5,136,613 ) Ps. 145,566,497 For the year ended December 31, 2019 Balance at Acquisitions Acquisitions Disposals and Amortization Effect of Balance at end Licenses and rights of use Ps. 233,478,974 Ps. 13,206,877 Ps. 7,844,339 Ps. 7,286,114 Ps. — Ps. (15,715,442 ) Ps. 246,100,862 Accumulated amortization (130,180,579 ) — — (2,391,624 ) (11,577,160 ) 9,481,480 (134,667,883 ) Net 103,298,395 13,206,877 7,844,339 4,894,490 (11,577,160 ) (6,233,962 ) 111,432,979 Trademarks 28,207,166 53,467 — (6,012 ) — (835,613 ) 27,419,008 Accumulated amortization (23,539,961 ) — — — (1,008,483 ) 618,145 (23,930,299 ) Net 4,667,205 53,467 — (6,012 ) (1,008,483 ) (217,468 ) 3,488,709 Customer relationships 25,543,068 20,248 — 5,507 — (2,693,812 ) 22,875,011 Accumulated amortization (18,761,537 ) — — — (3,371,924 ) 2,357,831 (19,775,630 ) Net 6,781,531 20,248 — 5,507 (3,371,924 ) (335,981 ) 3,099,381 Software licenses 14,309,258 2,729,480 — (949,858 ) — (2,984,770 ) 13,104,110 Accumulated amortization (7,704,803 ) — — (1 ) (2,479,088 ) 2,183,149 (8,000,743 ) Net 6,604,455 2,729,480 — (949,859 ) (2,479,088 ) (801,621 ) 5,103,367 Content rights 7,549,709 1,427,694 — 1,638,007 — (455,228 ) 10,160,182 Accumulated amortization (6,763,592 ) — — (8,720 ) (1,772,779 ) 429,862 (8,115,229 ) Net 786,117 1,427,694 — 1,629,287 (1,772,779 ) (25,366 ) 2,044,953 Total of intangibles, net Ps. 122,137,703 Ps. 17,437,766 Ps. 7,844,339 Ps. 5,573,413 Ps. (20,209,434 ) Ps. (7,614,398 ) Ps. 125,169,389 Goodwill Ps. 145,566,497 Ps. — Ps. 10,869,571 Ps. (843,005 ) — Ps. (2,693,262 ) Ps. 152,899,801 For the year ended December 31, 2020 Balance at beginning of year Acquisitions Acquisitions in business combinations Disposals and other Amortization of the year Effect of translation of foreign subsidiaries and Hyperinflation adjustment Balance at end of year Licenses and rights of use Ps. 246,100,862 Ps. 15,079,714 Ps. 4,436,313 Ps. 1,502,981 Ps. — Ps. (14,029,709 ) Ps. 253,090,161 Accumulated amortization (134,667,883 ) — — 105,892 (14,274,497 ) 14,227,424 (134,609,064 ) Net 111,432,979 15,079,714 4,436,313 1,608,873 (14,274,497 ) 197,715 118,481,097 Trademarks 27,419,008 162,309 12,110 4,000 — 1,534,938 29,132,365 Accumulated amortization (23,930,299 ) — — (4,276 ) (300,727 ) (1,119,645 ) (25,354,947 ) Net 3,488,709 162,309 12,110 (276 ) (300,727 ) 415,293 3,777,418 Customer relationships 22,875,011 1,935 2,689,718 (5,763 ) — 4,018,365 29,579,266 Accumulated amortization (19,775,630 ) — — 855 (1,654,237 ) (3,996,593 ) (25,425,605 ) Net 3,099,381 1,935 2,689,718 (4,908 ) (1,654,237 ) 21,772 4,153,661 Software licenses 13,104,110 2,445,784 36 (2,485,429 ) — 4,236,645 17,301,146 Accumulated amortization (8,000,743 ) — — 2,013,617 (2,667,870 ) (3,578,452 ) (12,233,448 ) Net 5,103,367 2,445,784 36 (471,812 ) (2,667,870 ) 658,193 5,067,698 Content rights 10,160,182 1,570,415 — (313,942 ) — 619,657 12,036,312 Accumulated amortization (8,115,229 ) — — — (1,440,749 ) (503,241 ) (10,059,219 ) Net 2,044,953 1,570,415 — (313,942 ) (1,440,749 ) 116,416 1,977,093 Total of intangibles, net Ps. 125,169,389 Ps. 19,260,157 Ps. 7,138,177 Ps. 817,935 Ps. (20,338,080 ) Ps. 1,409,389 Ps. 133,456,967 Goodwill Ps. 152,899,801 Ps. — Ps. (7,014,120 ) Ps. (537,343 ) Ps. — Ps. (2,295,479 ) Ps. 143,052,859 b) The aggregate carrying amount of goodwill is allocated as follows: 2019 2020 Europe Ps. 52,950,325 Ps. 53,388,139 Brazil 28,062,398 18,730,686 Puerto Rico 17,463,394 17,463,394 Dominican Republic 14,186,723 14,186,723 Colombia 12,124,685 12,253,743 México 10,148,380 10,148,380 Peru 2,739,947 2,710,979 Chile 2,364,816 2,558,098 El Salvador 2,499,552 2,499,544 United States (Tracfone) 3,220,105 3,362,900 Ecuador 2,155,384 2,155,384 Guatemala 3,245,613 2,301,533 Other countries 1,738,479 1,293,356 Ps. 152,899,801 Ps. 143,052,859 c) The following is a description of the major changes in the “Licenses and rights of use” caption during the years ended December 31, 2018, 2019 and 2020: 2018 Acquisitions i) In December, Dominican Republic acquired radio spectrum totaling Ps.709,829 (RD$ 1,831,427) with a useful life of 11 years. ii) Additionally, in 2018, the Company acquired other licenses in Paraguay, Puerto Rico, Europe, Argentina, Chile and others countries in the amount of Ps.3,517,415. 2019 Acquisitions i) In 2019, Claro Brasil increased its licenses value by Ps.3,457,251 by renewal licenses Anatel and reversion of IRU of Telxus referring to ICMS. ii) In 2019, Austria acquired licenses to operate certain frequencies for Ps.3,023,732, (3.5 GHz; EUR 64.3 mn), Belarus (2.1 GHz; EUR 9.5 mn) and Croatia (2.1 GHz; EUR 7.2 mn). iii) In 2019, Telmex increased its licenses value by Ps.459,668 for rights to use IFETEL with a validity of 20 years, and a right to use submarine cable with a validity of 10 years. iv) In January 2019, Telcel acquired licenses for an amount of Ps.1,649,525 for PC´s 98 concessions titles and September 30, 2019 for 400 MHZ concessions titles. v) In December 2019, Comcel increased its licenses value by Ps.2,753,768 or (468,511,573,375 Colombian pesos) in accordance with Res.3386 of December 23, granted Claro (Comcel) the 20 years renewal of 10 MHz of spectrum in the 1900 MHz band. vi) Additionally, in 2019, the Company acquired other licenses in Puerto Rico, Argentina, Guatemala, Panamá and other countries in the amount of Ps.1,862,934. 2020 Acquisitions i) In February 2020, Comcel increased its licenses value by Ps.9,246,825 for an auction of the 30 Mhz spectrum in the 2,500 band for a period of 20 years in accordance with resolution. 325,326 and 327 of February 20, 2020 issued by the Ministry of Information and Communication (MINTIC) ii) In 2020, Telcel acquired licenses for an amount Ps.1,806,875 for Axtel and Ultra Vision concession titles valid from 2020 to 2040. iii) In January 2020, CTE acquired licenses by Ps.620,052 for 12 pairs of frequencies, advance payment of Advanced Wireless Services (AWS) band and complementary payment of AWS band of block 4. iv) In 2020, TAG acquired licenses for the right of us for Ps.1,704,280, in Slovenia and VIP Movil 1940E. v) Additionally, in 2020, the Company acquired other licenses in Puerto Rico, Argentina, Uruguay, Honduras, Paraguay, Brasil and other countries in the amount of Ps.1,701,682. Amortization of intangibles for the years ended December 31, 2018, 2019 and 2020 amounted to Ps.25,798,610, Ps.20,209,434 and Ps.20,338,080, respectively. Some of the jurisdictions in which the Company operates can revoke their concessions under certain circumstances such as imminent danger to national security, national economy and natural disasters.

Business combinations, acquisit

Business combinations, acquisitions and non-controlling interest	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Business combinations, acquisitions and non-controlling interest	12. Business combinations, acquisitions and non-controlling a) Acquisitions 2019 a) On January 24, 2019, the Company acquired 100% of Telefónica Móviles Guatemala, S.A (“Telefónica Guatemala”) from Telefónica S.A. and certain of its affiliates. The acquired company provides mobile and fixed telecommunications services, including voice, data and Pay TV. The final purchase price paid for the business acquisition was Ps.5,734,254, net of acquired cash. For the purchase accounting, the Company determined the fair value of Telefónica Guatemala´s identifiable assets and liabilities based on relative fair values. 2019 amounts at the Current assets Ps. 1,312,906 Other non-current 257,853 Intangible assets (excluding goodwill) 1,354,105 Property, plant and equipment 4,144,334 Rights-of-use 864,046 Total assets acquired 7,933,244 Accounts payable 1,248,470 Other liabilities 1,705,580 Total liabilities assumed 2,954,050 Fair value of assets acquired a liabilities assumed-net 4,979,194 Acquisition Price 6,174,330 Goodwill Ps. 1,195,136 b) On December 18, 2019, after receipt of the necessary approvals from local regulators, the Company completed the previously announced acquisition of 100% of Nextel Telecomunicações Ltda. and its subsidiaries (“Nextel Brazil”), from NII Holdings, Inc. and certain of its affiliates (“NII”) and AI Brazil Holdings B.V. Nextel Brazil provides nationwide mobile telecommunications services. The aggregate purchase price was Ps.17,992,362, after making adjustments pursuant to the Purchase Agreement. After deducting Ps.9,325,712 of net debt, the net purchase consideration transferred at closing was Ps.6,905,539 net of acquired cash. The net assets recognized in the 31 December 2019 financial statements were based on provisional amounts, the Company finished the Purchase Price allocation adjusting some values mainly for the spectrum licenses from the provisional goodwill, as a result the final goodwill was Ps.1,912,372. The final amounts as of the date of the financial statement and the values of the assets acquired and liabilities ass u med are as foll o 2019 amounts at the acquisition date Current assets Ps. 6,366,943 Other non-current assets 5,970,810 Intangible assets (excluding goodwill) 12,914,175 Property, plant and equipment 5,147,093 Rights-of-use assets 8,086,655 Total assets acquired 38,485,676 Accounts payable 9,170,230 Other liabilities 22,504,097 Total liabilities assumed 31,674,327 Fair value of assets acquired a liabilities assumed-net 6,811,349 Purchase consideration transferred 8,723,721 Goodwill Ps. 1,912,372 Acquisitions 2020 a) During 2020, the Company acquired through its subsidiaries, other entities for which it paid Ps.152,896, net of acquired cash. b) The Company acquired an additional non-controlling c) In December 2020, the offer submitted by our Brazilian subsidiary, Claro, jointly with Telefónica Brasil, S.A. and TIM, S.A. for the acquisition of the mobile business owned by Oi Group was accepted. The offer is in the amount of R$16.5 billion, of which Claro will pay 22%. In consideration of such amount, Claro will receive 32% of Oi Group’s mobile business customer base and approximately 4.7 thousand mobile access sites. The closing of the transaction is subject to customary conditions including regulatory approvals from Anatel and Conselho Administrativo de Defesa Econômica, CADE. Consolidated subsidiaries with non-controlling interests The Company has control over Telekom Austria, which has a material non-controlling Selected financial data from the consolidated statements of financial position December 31, 2019 2020 Assets: Current assets Ps. 29,516,038 Ps. 32,775,046 Non-current 137,724,390 150,747,947 Total assets Ps.167,240,428 Ps.183,522,993 Liabilities and equity: Current liabilities Ps. 34,608,254 Ps. 49,942,415 Non-current 89,711,288 82,293,652 Total liabilities 124,319,542 132,236,067 Equity attributable to equity holders of the parent 21,864,132 26,129,649 Non-controlling (1) 21,056,754 25,157,277 Total equity Ps. 42,920,886 Ps. 51,286,926 Total liabilities and equity Ps.167,240,428 Ps.183,522,993 Summarized consolidated statements of comprehensive income For the year ended December 31, 2018 2019 2020 Operating revenues Ps.100,716,444 Ps.98,420,289 Ps.111,472,191 Operating costs and expenses 95,984,880 89,732,428 98,312,325 Operating income Ps. 4,731,564 Ps. 8,687,861 Ps. 13,159,866 Net income Ps. 3,809,694 Ps. 5,051,145 Ps. 7,787,388 Total comprehensive income Ps. 5,047,838 Ps. 1,466,783 Ps. 12,103,406 Net income attributable to: Equity holders of the parent Ps. 1,942,944 Ps. 2,565,733 Ps. 3,986,412 Non-controlling 1,866,750 2,485,412 3,800,976 Ps. 3,809,694 Ps. 5,051,145 Ps. 7,787,388 Comprehensive income attributable to: Equity holders of the parent Ps. 2,574,397 Ps. 748,059 Ps. 6,172,737 Non-controlling 2,473,441 718,724 5,930,669 Ps. 5,047,838 Ps. 1,466,783 Ps. 12,103,406

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Income Taxes	13. Income Taxes As explained previously in these consolidated financial statements, the Company is a Mexican corporation which has numerous consolidated subsidiaries operating in different countries. Presented below is a discussion of income tax matters that relates to the Company’s consolidated operations, its Mexican operations and significant foreign operations. i) Consolidated income tax matters The composition of income tax expense for the years ended December 31, 2018, 2019 and 2020 is as follows: 2018 2019 2020 In Mexico: Current year income tax Ps. 28,572,414 Ps. 26,295,431 Ps. 13,407,948 Deferred income tax (2,688,727 ) 208,658 (9,334,246 ) Foreign: Current year income tax 19,898,728 20,843,720 15,250,218 Deferred income tax 694,664 3,685,724 (2,957,768 ) Ps. 46,477,079 Ps. 51,033,533 Ps. 16,366,152 Deferred tax related to items recognized in OCI during the year: For the years ended December 31, 2018 2019 2020 Remeasurement of defined benefit plans Ps. 408,735 Ps.9,217,320 Ps. 4,151,600 Equity investments at fair value 1,613,667 (378,606 ) (665,814 ) Other (8,922 ) — (35,670 ) Revaluation assets — — (29,922,597 ) Deferred tax benefit recognized in OCI Ps.2,013,480 Ps.8,838,714 Ps.(26,472,481 ) A reconciliation of the statutory income tax rate in Mexico to the consolidated effective income tax rate recognized by the Company is as follows: Year ended December 31, 2018 2019 2020 Statutory income tax rate in Mexico 30.0 % 30.0 % 30.0 % Impact of non-deductible non-taxable Tax inflation effects 7.3 % 3.5 % 6.1 % Derivatives 0.4 % (0.1 %) (0.7 %) Employee benefits 1.3 % 1.8 % 3.0 % Other 6.3 % 1.8 % (2.4 %) Effective tax rate on Mexican operations 45.3 % 37.0 % 36.0 % Tax recoveries in Brazil — — (9.3 %) Dividends received from associates Equity (0.8 %) (0.4 %) (0.9 %) Foreign subsidiaries and other non-deductible 1.5 % 5.5 % (1.5 %) Effective tax rate 46.0 % 42.1 % 24.3 % An analysis of temporary differences giving rise to the net deferred tax liability is as follows: Consolidated statements of financial position Consolidated statements of net income 2019 2020 2018 2019 2020 Provisions Ps. 17,964,305 Ps. 19,312,081 Ps. 1,841,705 Ps. (257,070 ) Ps. 4,458,848 Deferred revenues 5,820,260 6,748,101 3,632,051 (1,077,259 ) 897,762 Tax losses carry forward 26,630,407 25,121,933 (5,833,660 ) (9,873 ) 2,236,244 Property, plant and equipment (1) (11,962,544 ) (39,459,549 ) 453,493 (461,594 ) 3,524,761 Inventories 1,787,065 (537,404 ) 81,270 (291,531 ) (2,393,979 ) Licenses and rights of use (1) (3,399,931 ) (5,177,924 ) 961,402 432,403 344,729 Employee benefits 41,743,744 45,467,827 1,128,209 (1,019,042 ) 422,473 Other 9,491,550 14,828,012 (270,407 ) (1,210,417 ) 2,801,176 Net deferred tax assets Ps. 88,074,856 Ps. 66,303,077 Deferred tax expense in net profit for the year Ps. 1,994,063 Ps. (3,894,383 ) Ps. 12,292,014 (1) As of December 31, 2020 the balance included the effects of hyperinflation and revaluation of telecommunications towers. Reconciliation of deferred tax assets and liabilities, net: 2018 2019 2020 Opening balance as of January 1, Ps. 104,573,985 Ps. 86,613,327 Ps. 88,074,856 Deferred tax benefit 1,994,063 (3,894,38 3 ) 12,292,014 Translation effect (8,854,010 ) 2,047,91 5 375,105 Deferred tax benefit recognized in OCI 2,013,480 8,838,714 (26,472,481 ) Deferred taxes acquired in business combinations (25,827 ) (276,568 ) (2,580,552 ) Hyperinflationary effect in Argentina (4,907,151 ) (5,254,149 ) (5,385,865 ) Effect of adoption of IFRS 9 544,628 — — Effect of adoption of IFRS 15 (8,725,841 ) — — Closing balance as of December 31, Ps. 86,613,327 Ps. 88,074,856 Ps. 66,303,077 Presented in the consolidated statements of financial position as follows: Deferred income tax assets Ps.111,186,768 Ps.106,167,897 Ps.115,370,240 Deferred income tax liabilities (24,573,441 ) (18,093,041 ) (49,067,163 ) Ps. 86,613,327 Ps. 88,074,856 Ps. 66,303,077 The deferred tax assets are in tax jurisdictions in which the Company considers that based on financial projections of its cash flows, results of operations and synergies between subsidiaries, will generate sufficient taxable income in subsequent periods to utilize or realize such assets. The Company does not recognize a deferred tax liability related to the undistributed earnings of its subsidiaries, because it currently does not expect these earnings to be taxable or to be repatriated in the near future. The Company’s policy has been to distribute the profits w h At December 31, 2019 and 2020, the balance of the contributed capital account (“CUCA”) is Ps.551,221,490 and Ps.573,362,949 respectively. Effectively, on January 1, 2014, the Cuenta de Utilidad Fiscal Neta ii) Significant foreign income tax matters a) Results of operations The foreign subsidiaries determine their taxes on profits based on their individual taxable income, in accordance with the specific tax regimes of each country. The effective income tax rate for the Company’s foreign jurisdictions was 31% in 2018, 40% in 2019 and 18% in 2020. The statutory tax rates in these jurisdictions vary, although many approximate 10% to 34%. The primary difference between the statutory rates and the effective rates in 2018, 2019 and 2020 was attributable to dividends received from KPN, other non-deductible non-taxable a.1 h iii) Tax losses a) At December 31, 2020, the available tax loss carryforwards recorded in deferred tax assets are as follows on a country by country ba s is: Country Gross balance of available tax loss carryforwards at December 31, 2020 Tax-effected loss carryforward benefit Brazil Ps. 44,578,152 Ps. 15,156,572 Mexico 20,523,070 6,156,920 Austria 11,631,381 2,907,845 United States 3,023,441 786,095 Peru 380,770 112,327 Puerto Rico 5,574 2,174 Total Ps. 80,142,388 Ps. 25,121,933 b) bi) The Company believes that it is more likely than not that the accumulated balances of its net deferred tax assets are recoverable, based on the positive evidence of the Company to generate future taxable income related to the same taxation authority which will result in taxable amounts against which the available tax losses can be utilized before they expire. bii) biii) iv) Optional regime The Mexican Tax Law establishes an optional regime for group companies called: Optional Regime for Groups of Companies. For these purposes, the integrating (controlling) company must own more than 80% of the shares with voting rights of the integrated (controlled) companies. In general terms, the Integration regime allowed deferral, for each of the companies that make up the group, and for up to three years, or sooner if certain assumptions are made, the whole of the income tax that results from considering the determination of the individual income tax to its charge is the effect derived from recognizing, indirectly, the tax losses incurred by the companies in the group for the year in question. On December 19, 2019, the integrating company submitted to the Mexican tax authorities, the notice to end to belong under the Optional Regime for Groups of Companies, which implies, pay in January 2020, the deferred income tax for the years 2016-2018. Therefore, from the year 2020, the group will be taxable under the General Regime for Legal Persons. v) Limiting interest deductions The Mexican Tax Law establishes for 2020 further new rules related with the limiting interest deductions, in concordance with the action 4 of Base Erosion and Profit Shifting (BEPS) project, by Organization for Economic Co-operation In general terms, each Mexican companies should calculated a Tax EBITDA, whose amount by the corporate income tax, will be the limit allow to deduct in the tax year it’s important to underline the amount that was not deductible could be carryforward in the following ten years. vi) Revaluation of telecommunications towers Deferred taxes related to the revaluation of the passive infrastructure of the telecommunications towers have been calculated at the tax rate of the jurisdiction in which the subsidiaries are located.

Debt

Debt	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Debt	14. Debt a) The Company’s short-and long-term debt consists of the following: At December 31, 2019 (Thousands of Mexican pesos) Currency Loan Interest rate Maturity Total Senior Notes U.S. dollars Fixed-rate Senior notes (i) 5.000% 2020 Ps. 11,774,764 Fixed-rate Senior notes (i) 3.125% 2022 30,152,320 Fixed-rate Senior notes (i) 3.625% 2029 18,845,200 Fixed-rate Senior notes (i) 6.375% 2035 18,493,360 Fixed-rate Senior notes (i) 6.125% 2037 6,958,119 Fixed-rate Senior notes (i) 6.125% 2040 37,690,400 Fixed-rate Senior notes (i) 4.375% 2042 21,671,980 Fixed-rate Senior notes (i) 4.375% 2049 23,556,500 Subtotal U.S. dollars Ps.169,142,643 Mexican pesos Domestic Senior notes (i) 8.600% 2020 Ps. 7,000,000 Fixed-rate Senior notes (i) 6.450% 2022 22,500,000 Fixed-rate Senior notes (i) 7.125% 2024 11,000,000 Domestic Senior notes (i) 0.000% 2025 4,757,592 Fixed-rate Senior notes (i) 8.460% 2036 7,871,700 Domestic Senior notes (i) 8.360% 2037 5,000,000 Subtotal Mexican pesos Ps. 58,129,292 Euros Commercial Paper (iv) -0.230% 2020 Ps. 2,599,128 Exchangeable Bond (i) 0.000% 2020 60,051,270 Fixed-rate Senior notes (i) 3.000% 2021 21,131,123 Fixed-rate Senior notes (i) 3.125% 2021 15,848,342 Fixed-rate Senior notes (i) 4.000% 2022 15,848,342 Fixed-rate Senior notes (i) 4.750% 2022 15,848,342 Fixed-rate Senior notes (i) 3.500% 2023 6,339,337 Fixed-rate Senior notes (i) 3.259% 2023 15,848,342 Fixed-rate Senior notes (i) 1.500% 2024 17,961,454 Fixed-rate Senior notes (i) 1.500% 2026 15,848,342 Fixed-rate Senior notes (i) 0.750% 2027 21,131,123 Fixed-rate Senior notes (i) 2.125% 2028 13,735,230 Subtotal Euros Ps.222,190,375 Pound Sterling Fixed-rate Senior notes (i) 5.000% 2026 Ps. 12,491,541 Fixed-rate Senior notes (i) 5.750% 2030 16,239,003 Fixed-rate Senior notes (i) 4.948% 2033 7,494,924 Fixed-rate Senior notes (i) 4.375% 2041 18,737,311 Subtotal Pound Sterling Ps. 54,962,779 Brazilian reais Debentures (i) 102.900% of CDI 2020 Ps. 7,013,124 Debentures (i) 104.000% of CDI 2021 5,142,958 Debentures (i) 104.250% of CDI 2021 7,083,256 Promissory notes (i) CDI + 0.600% 2021 1,683,150 Promissory notes (i) 106.000% of CDI 2022 9,350,832 Promissory notes (i) 106.500% of CDI 2022 4,675,416 Subtotal Brazilian reais Ps. 34,948,736 Other currencies Japanese yen Fixed-rate Senior notes (i) 2.950% 2039 Ps. 2,255,663 Subtotal Japanese yen Ps. 2,255,663 Chilean pesos Fixed-rate Senior notes (i) 3.961% 2035 Ps. 3,562,695 Subtotal Chilean pesos Ps. 3,562,695 Subtotal other currencies Ps. 5,818,358 Hybrid Notes Euros Euro NC10 Series B Capital Securities (iii) 6.375% 2073 Ps. 11,622,118 Subtotal Euros Ps. 11,622,118 Pound Sterling GBP NC7 Capital Securities (iii) 6.375% 2073 Ps. 13,740,695 Subtotal Pound Sterling Ps. 13,740,695 Subtotal Hybrid Notes Ps. 25,362,813 Lines of Credit and others U.S. dollars Lines of credit (ii) 5.500% - 9.020% 2020 - 2024 Ps. 9,359,340 Mexican pesos Lines of credit (ii) TIIE + 0.050% - TIIE + 0.090% 2020 Ps. 22,000,000 Euros Lines of credit (ii) 0.030% 2020 Ps. 2,113,112 Peruvian Soles Lines of credit (ii) 3.550% - 3.700% 2020 - 2021 Ps. 15,351,211 Chilean pesos Lines of credit (ii) TAB + 0.350% 2021 Ps. 4,821,222 Financial Leases 8.700% - 8.970% 2020 - 2027 Ps. 54,596 Subtotal Lines of Credit and others Ps. 53,699,481 Total debt Ps.624,254,477 Less: Short-term debt and current portion of long-term debt Ps.129,172,033 Long-term debt Ps.495,082,444 At December 31, 2020 (Thousands of Mexican pesos) Currency Loan Interest rate Maturity Total Senior Notes U.S. dollars Fixed-rate Senior notes (i) 3.125% 2022 Ps. 31,917,920 Fixed-rate Senior notes (i) 3.625% 2029 19,948,700 Fixed-rate Senior notes (i) 2.875% 2030 19,948,700 Fixed-rate Senior notes (i) 6.375% 2035 19,576,258 Fixed-rate Senior notes (i) 6.125% 2037 7,365,559 Fixed-rate Senior notes (i) 6.125% 2040 39,897,400 Fixed-rate Senior notes (i) 4.375% 2042 22,941,005 Fixed-rate Senior notes (i) 4.375% 2049 24,935,875 Subtotal U.S. dollars Ps. 186,531,417 Mexican pesos Fixed-rate Senior notes (i) 6.450% 2022 Ps. 22,500,000 Fixed-rate Senior notes (i) 7.125% 2024 11,000,000 Domestic Senior notes (i) 0.000% 2025 4,911,181 Fixed-rate Senior notes (i) 8.460% 2036 7,871,700 Domestic Senior notes (i) 8.360% 2037 5,000,000 Subtotal Mexican pesos Ps. 51,282,881 Euros Fixed-rate Senior notes (i) 3.000% 2021 Ps. 24,369,332 Fixed-rate Senior notes (i) 3.125% 2021 18,276,999 Fixed-rate Senior notes (i) 4.000% 2022 18,276,999 Fixed-rate Senior notes (i) 4.750% 2022 18,276,999 Fixed-rate Senior notes (i) 3.500% 2023 7,310,800 Fixed-rate Senior notes (i) 3.259% 2023 18,276,999 Fixed-rate Senior notes (i) 1.500% 2024 20,713,932 Fixed-rate Senior notes (i) 1.500% 2026 18,276,999 Fixed-rate Senior notes (i) 0.750% 2027 24,369,332 Fixed-rate Senior notes (i) 2.125% 2028 15,840,066 Commercial Paper (iv) -0.230% -0.310% 2021 40,940,477 Subtotal Euros Ps. 224,928,934 Pound Sterling Fixed-rate Senior notes (i) 5.000% 2026 Ps. 13,634,936 Fixed-rate Senior notes (i) 5.750% 2030 17,725,417 Fixed-rate Senior notes (i) 4.948% 2033 8,180,962 Fixed-rate Senior notes (i) 4.375% 2041 20,452,405 Subtotal Pound Sterling Ps. 59,993,720 Brazilian reais Debentures (i) 104.000% of 2021 Ps. 4,222,597 Debentures (i) 104.250% of 2021 5,815,668 Promissory notes (i) CDI + 0.600% 2021 1,381,941 Debentures (i) CDI + 0.960% 2022 9,596,811 Promissory notes (i) 106.000% of 2022 7,677,449 Debentures (i) 106.500% of 2022 3,838,725 Subtotal Brazilian reais Ps. 32,533,191 Other currencies Japanese yen Fixed-rate Senior notes (i) 2.950% 2039 Ps. 2,511,701 Subtotal Japanese yen Ps. 2,511,701 Chilean pesos Fixed-rate Senior notes (i) 3.961% 2035 Ps. 4,078,453 Subtotal Chilean pesos Ps. 4,078,453 Subtotal other currencies Ps. 6,590,154 Hybrid Notes Euros Euro NC10 Series B Capital Securities (iii) 6.375% 2073 Ps. 13,403,133 Subtotal Euros Ps. 13,403,133 Subtotal Hybrid Notes Ps. 13,403,133 Lines of Credit and others Mexican pesos Lines of credit (ii) TIIE + 0.300% - 2021 Ps. 27,100,000 Peruvian Soles Lines of credit (ii) 1.200% - 1.450% 2021 Ps. 17,094,079 Chilean pesos Lines of credit (ii) TAB + 0.350% and 2021 Ps. 8,868,181 Financial Leases 8.700% - 8.970% 2021 - 2027 Ps. 57,266 Subtotal Lines of Credit and others Ps. 53,119,526 Total debt Ps. 628,382,956 Less: Short-term debt and current portion of long-term debt Ps. 148,083,184 Long-term debt Ps. 480,299,772 L= LIBOR (London Interbank Offered Rate) TIIE = Mexican Interbank Rate CDI = Brazil Interbank Deposit Rate TAB= Chilean weighted average funding rate Interest rates on the Company’s debt are subject to variances in international and local rates. The Company’s weighted average cost of borrowed funds at December 31, 2019, and December 31, 2020 was approximately 4.16% and 3.72%, respectively. Such rates do not include commissions or the reimbursements for Mexican tax withholdings (typically a tax rate of 4.9%) that the Company must pay to international lenders. An analysis of the Company’s short-term debt maturities as of December 31, 2019, and December 31, 2020, is as follows: 2019 2020 Obligations and Senior Notes Ps. 88,438,286 Ps. 95,007,014 Lines of credit 40,722,004 53,062,260 Financial Leases 11,743 13,910 Total Ps. 129,172,033 Ps. 148,083,184 Weighted average interest rate 3.31 % 2.23 % The Company’s long-term debt maturities as of December 31, 2020 are as follows: Years Amount 2022 Ps. 112,091,112 2023 25,594,561 2024 31,721,298 2025 and thereafter 310,892,801 Total Ps. 480,299,772 (i) Senior Notes The outstanding Senior Notes at December 31, 2019, and December 31, 2020, are as follo w Currency* 2019 2020 U.S. dollars Ps. 169,142,643 Ps. 186,531,417 Mexican pesos 58,129,292 51,282,881 Euros** 222,190,375 183,988,456 Pounds sterling** 54,962,779 59,993,720 Brazilian reais 34,948,736 32,533,191 Japanese yens 2,255,663 2,511,701 Chilean pesos 3,562,695 4,078,453 * Thousands of Mexican peso s ** Includes secured and unsecured senior notes. (ii) Lines of credit At December 31, 2019, and December 31, 2020, debt under lines of credit aggregated to Ps.$53,645 million and Ps.$53,062 million, respectively. The Company has two revolving syndicated credit facilities, one for the Euro equivalent of U.S. $2,000 million and the other for U.S. $2,500 million maturing in 2021 and 2024, respectively. As long as the facilities are committed, a commitment fee is paid. As of December 31, 2020, these credit facilities are undrawn. Telekom Austria has an undrawn revolving syndicated credit facility in Euros for €1,000 million that matures in 2026. (iii) Hybrid Notes We currently have a Capital Securities (hybrid notes) maturing in 2073: a series denominated in euros for a total amount of €550 million with a coupon of 6.375%. The Capital Securities are deeply subordinated, and when they were issued the principal rating agencies stated that they would treat only half of the principal amount as indebtedness for purposes of evaluating our leverage (an analysis referred to as 50.0% equity credit). The Capital Securities are subject to redemption at our option at varying dates beginning in 2023 for the euro-denominated series. (iv) Commercial Paper In August 2020, we established a new Euro-Commercial Paper program for a total amount of €2,000 million. At December 31, 2020, debt under this program aggregated to Ps.40,940 million. Restrictions A portion of the debt is subject to certain restrictions with respect to maintaining certain financial ratios, as well as restrictions on selling a significant portion of groups of assets, among others. At December 31, 2020, the Company was in compliance with all these requirements. A portion of the debt is also subject to early maturity or repurchase at the option of the holders in the event of a change in control of the Company, as defined in each instrument. The definition of change in control varies from instrument to instrument; however, no change in control shall be considered to have occurred as long as its current shareholders continue to hold the majority of the Company’s voting shares. Covenants In conformity with the credit agreements, the Company is obliged to comply with certain financial and operating commitments. Such covenants limit in certain cases, the ability of the Company or the guarantor to: pledge assets, carry out certain types of mergers, sell all or substantially all of its assets, and sell control of Telcel. Such covenants do not restrict the ability of AMX’s subsidiaries to pay dividends or other payment distributions to AMX. The more restrictive financial covenants require the Company to maintain a consolidated ratio of debt to EBITDA (defined as operating income plus depreciation and amortization) that does not exceed 4 to 1, and a consolidated ratio of EBITDA to interest paid that is not below 2.5 to 1 (in accordance with the clauses included in the credit agreements). Several of the financing instruments of the Company may be accelerated, at the option of the debt holder in the case that a change in control occurs. At December 31, 2020, the Company was in compliance with all the covenants.

Right of use assets and lease d

Right of use assets and lease debt	12 Months Ended
	Dec. 31, 2020
Presentation of leases for lessee [abstract]
Right of use assets and lease debt	15. Right-of-use The Company has lease contracts for various items of towers & sites, property and other equipment used in its operations. Towers and sites generally have lease terms between 5 and 12 years, while property and other equipment generally have lease terms between 5 and 25 years. At December 31, 2019 and 2020 the right-of-use assets and lease liabilities are as follows: Right-of-use assets Liability related to right-of-use Towers & Sites Property Other Total As of January 1, 2019 Ps. 94,252,098 Ps. 21,075,884 Ps. 4,750,320 Ps. 120,078,302 Ps. 119,387,660 Additions and release 6,364,508 921,542 729,001 8,015,051 7,437,621 Business Combinations 9,668,507 — — 9,668,507 10,810,111 Modifications 7,474,469 1,288,974 728,837 9,492,280 8,363,045 Depreciation (17,286,497 ) (4,941,222 ) (1,365,847 ) (23,593,566 ) — Interest expense — — — — 7,940,240 Payments — — — — (26,765,075 ) Translation adjustment (4,370,636 ) (905,808 ) (380,907 ) (5,657,351 ) (6,576,869 ) Balance at December 31, 2019 Ps. 96,102,449 Ps. 17,439,370 Ps. 4,461,404 Ps. 118,003,223 Ps. 120,596,733 Balance at the beginning of the year Ps. 96,102,449 Ps. 17,439,370 Ps. 4,461,404 Ps. 118,003,223 Ps. 120,596,733 Additions and release 5,745,869 309,576 1,514,519 7,569,964 4,833,959 Modifications 8,559,335 (3,035,831 ) 1,048,858 6,572,362 7,769,326 Depreciation (22,064,413 ) (3,440,428 ) (2,866,244 ) (28,371,085 ) — Interest expense — — — — 9,134,288 Payments — — — — (29,623,565 ) Translation adjustment (3,124,365 ) 932,748 393,997 (1,797,620 ) (3,383,500 ) Balance at December 31, 2020 Ps. 85,218,875 Ps. 12,205,435 Ps. 4,552,534 Ps. 101,976,844 Ps. 109,327,241 At December 31, 2019 and 2020, the total of the right-of-use The implementation of IFRS 16 required a significant effort due to the fact of the need to make certain estimates, such as the lease term, based on the non-cancelable non-cancelable e The lease debt of the Company is integrated according to its maturities as follows: 2020 Short term Ps. 25,067,905 Long term 84,259,336 Total Ps. 109,327,241 The Company’s long-term debt maturities as of December 31, 2020 are as foll o ws: Year ended December 31, 2022 Ps. 35,744,268 2023 12,778,050 2024 9,606,195 2025 and thereafter 26,130,823 Total Ps. 84,259,336 During the years ended December 31 2019 and 2020, the Company recognized expenses as follows: 2019 Others Related parties Total Depreciation expense of right-of-use Ps.18,176,521 Ps.5,417,045 Ps.23,593,566 Interest expense on lease liabilities 5,654,721 2,285,519 7,940,240 Expense relating to short-term leases 1,978,403 1,958 1,980,361 Expense relating to leases of low-value 25,935 — 25,935 Variable lease payments 1,299,502 — 1,299,502 Total Ps.27,135,082 Ps.7,704,522 Ps.34,839,604 2020 Others Related parties Total Depreciation expense of right-of-use Ps.22,404,924 Ps.5,966,161 Ps.28,371,085 Interest expense on lease liabilities 7,081,693 2,052,595 9,134,288 Expense relating to short-term leases 32,238 — 32,238 Expense relating to leases of low-value 2,883 — 2,883 Variable lease payments 78,494 — 78,494 Total Ps.29,600,232 Ps.8,018,756 Ps.37,618,988 Impact on accounting for changes in lease payments applying the exemption. Based on the information available for evaluation as of the date of adoption, the effect of applying this amendment to IFRS 16 in the Company’s consolidated financial statements as of December 31, 2020 was Ps.277,680, reflecting an adjustment to accrued liability for leases and recognizing a benefit in the income statement for the period.

Accounts payable, accrued liabi

Accounts payable, accrued liabilities and asset retirement obligations	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Accounts payable, accrued liabilities and asset retirement obligations	16. Accounts payable, accrued liabilities and asset retirement obligations a) At December 31, 2019 2020 Suppliers Ps.113,370,716 Ps.74,285,881 Sundry creditors 90,849,195 101,406,307 Interest payable 8,057,170 7,661,762 Guarantee deposits from customers 1,467,835 1,386,645 Dividends payable 2,367,908 2,254,877 Total Ps.216,112,824 Ps.186,995,472 b) At December 31, 2019 2020 Current liabilities Direct employee benefits payable Ps. 17,991,283 Ps. 18,965,160 Contingencies 34,379,969 31,326,691 Total Ps. 52,371,252 Ps. 50,291,851 The movements in contingencies for the years ended December 31, 2019 and 2020 are as follows: Balance at December 31, 2018 Business combination Effect of translation Increase of the year Applications Reclassification Balance at December 31, 2019 Payments Reversals Contingencies Ps. 40,281,573 Ps. 1,378,611 Ps. (2,302,058 ) Ps. 6,410,975 Ps. (5,483,327 ) Ps. (1,833,518 ) Ps. (4,072,287 ) Ps. 34,379,969 Balance at December 31, 2019 Business combination Effect of translation Increase of the year Applications Balance at December 31, 2020 Payments Reversals Contingencies Ps. 34,379,969 Ps. 292 Ps. (4,290,753 ) Ps. 7,442,292 Ps. (3,214,407 ) Ps. (2,990,702 ) Ps. 31,326,691 Contingencies include tax, labor, regulatory and other legal type contingencies. See Note 17 b) for detail of contingencies. c) Balance at Business Effect of Increase of Applications Balance at Payments Reversals Asset retirement obligations Ps. 15,971,601 Ps. 293,548 Ps. (1,339,033 ) Ps. 1,600,197 Ps. (128,842 ) Ps. (580,727 ) Ps. 15,816,744 Balance at December 31, 2019 Business Effect of translation Increase of the year Applications Balance at December 31, 2020 Payments Reversals Asset retirement obligations Ps. 15,816,744 Ps. — Ps. 374,418 Ps. 2,412,908 Ps. (593,644 ) Ps. (122,435 ) Ps. 17,887,991 The discount rates used for the asset retirement obligation are based on market rates that are expected to be undertaken by the dismantling or restoration of cell sites and may include labor costs.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Commitments and Contingencies	17. Commitments and Contingencies a) Commitments The Company and its subsidiaries have commitments that mature on different dates, related to committed capital expenditures and cell phone purchases. As of December 31, 2020, the total amounts equivalent to the contract period are detailed below: Year ended December 31, 2021 Ps. 74,446,526 2022 37,345,449 2023 2,240,297 2024 and thereafter 13,555,946 Total Ps. 127,588,218 b) Contingencies In each of the countries in which we operate, we are party to legal proceedings in the ordinary course of business. These proceedings include tax, labor, antitrust, contractual matters and administrative and judicial proceedings concerning regulatory matters regarding interconnection and tariffs. The following is a description of our material legal proceedings. (1) Mexican Tax Assessment and Fine In 2014, the Mexican Tax Administration Service ( Servicio de Administración Tributaria Sercotel, S.A. de C.V. (2) Telcel Mobile Termination Rates The mobile termination rates between Telcel and other network operators have been the subject of various legal proceedings. With respect to interconnection fees for 2017, 2018, 2019, 2020 and 2021, Telcel has challenged the applicable resolutions and final resolutions are pending. With respect to 2021, Telcel will challenge the applicable resolutions. Given that the “zero rate” that prevented Telcel from charging termination rates in its mobile network was held unconstitutional by the Supreme Court ( Suprema Corte de Justicia de la Nación The Company expects that mobile termination rates, as well as other rates applicable to mobile interconnection (such as transit), will continue to be the subject of litigation and administrative proceedings. The Company cannot predict when or how these disputes will be resolved or the financial effects of any such resolution. (3) Telcel Class Action Lawsuits One of the three class action lawsuits that have been filed against Telcel by customers allegedly affected by Telcel’s quality of service and wireless and broadband rates continues in process, the remaining two lawsuits have been concluded without any adverse effect on the Company. At this stage, the Company cannot assess whether this class action lawsuit could have an adverse effect on the Company’s business and results of operations in the event that it is resolved against Telcel, due to uncertainty about the factual and legal claims underlying this proceeding. Consequently, the Company has not established a provision in the accompanying consolidated financial statements for an eventual loss arising from this proceeding. (4) IFT Proceedings Against Telmex In 2018, the IFT imposed a fine of Ps.2,543,937 on Telmex relating to a sanction procedure triggered by the alleged breach in 2013 and 2014 of certain minimum quality goals for link services. Telmex challenged this fine, and a final resolution is pending. (5) Brazilian Tax Matters As of December 31, 2020, certain Company’s Brazilian subsidiaries had aggregate tax contingencies of Ps.119,231,362 (R$ 31,060,349) for which the Company has established provisions of Ps.17,643,740 (R$ 4,596,280) in the accompanying consolidated financial statements for eventual losses arising from contingencies that the Company considers probable. The most significant contingencies for which provisions have been established are: • Ps.41,974,641 (R$ 10,934,598) aggregate contingencies and Ps.3,101,862 (R$ 808,050) provisions related to value-added tax ( Imposto sobre a Circulação de Mercadorias e Prestação de Serviços • Ps.20,151,371 (R$ 5,249,530) aggregate contingencies and Ps.3,319,251 (R$ 864,681) provisions related to social contribution on net income ( Contribuição Social sobre o Lucro Líquido Imposto de Renda sobre Pessoa Jurídica • Ps.14,991,233 (R$ 3,905,289) aggregate contingencies and Ps.4,993,865 (R$ 1,300,926) provisions related to the social integration program ( Programa de Integração Social Contribuição para o Financiamento da Seguridade Social • Ps.11,476,895 (R$ 2,989,787) aggregate contingencies and Ps.1,428,756 (R$ 372,198) provisions mainly related to an allegedly improper exclusion of interconnection revenues and costs from the basis used to calculate Fund for Universal Telecommunication Services ( Fundo de Universalização dos Serviços de Telecomunicações • Ps.4,410,628 (R$ 1,148,990) aggregate contingencies and Ps.656 (R$ 171) provisions related to an alleged underpayment of obligations to the Telecommunications Technology Development Fund ( Fundo para o Desenvolvimento Tecnológico das Telecomunicações • Ps.1,688,790 (R$ 439,938) aggregate contingencies and Ps.46,947 (R$ 12,230) provisions related to the alleged nonpayment of Services Tax ( Imposto Sobre Serviços • Ps.4,183,953 (R$ 1,089,940) aggregate contingencies and Ps.108,877 (R$ 28,363) provisions arising, among others, from the alleged underpayment of IRRF and CIDE taxes and on remittances made to foreign operators as remuneration for completing international calls abroad (outgoing traffic); and • Ps.3,848,354 (R$ 1,002,515) aggregate contingencies and Ps.3,826,631 (R$ 996,856) provisions related to the requirement to contribute to the Promotion of Public Radio Broadcasting (“EBC”). In addition, the Company’s Brazilian subsidiaries are subject to a number of contingencies for which it has not established provisions in the accompanying consolidated financial statements because the Company does not consider the potential losses related to these contingencies to be probable. These include a fine for Ps.12,921,410 (R$ 3,366,090) imposed for an unpaid installation inspection fee ( Taxa de Fiscalização de Instalação (6) Anatel Challenge to Inflation Adjustments Anatel has challenged the calculation of inflation-related adjustments due under the concession agreements with Tess S.A. (“Tess”), and Algar Telecom Leste S.A. (“ATL”), two of the Company’s subsidiaries that were previously merged into Claro Brasil. Anatel rejected Tess and ATL’s calculation of the inflation-related adjustments applicable to 60% of the concessions price (which was due in three equal annual installments, subject to inflation-related adjustments and interest), claiming that the companies’ calculation of the inflationrelated adjustments resulted in a shortfall of the installment payments. The companies have filed declaratory and consignment actions seeking the resolution of the disputes and have obtained injunctions from a federal appeals court suspending payment until the pending appeals are resolved. The amount of the alleged shortfall as well as the method used to calculate monetary corrections are in dispute. If other methods or assumptions are applied, the amount may increase. In 2019, Anatel calculated the monetary correction in a total amount of Ps.15,738,670 (R$ 4,100,000). As of December 31, 2020, the Company has established a provision of Ps.2,625,671 (R$ 684,000) in the accompanying consolidated financial statements for the losses arising from these contingencies, which the Company considers probable.

Employee Benefits

Employee Benefits	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Employee Benefits	18. Employee Benefits An analysis of the net liability and net period cost for employee benefits is as follows: At December 31, 2019 2020 Mexico Ps. 116,537,660 Ps. 129,260,355 Puerto Rico 13,228,592 14,924,874 Brazil 9,503,738 8,913,548 Europe 12,827,318 14,392,445 Ecuador 409,750 488,161 El Salvador 154,422 Nicaragua 61,337 Honduras 35,060 Total Ps. 152,507,058 Ps. 168,230,202 For the year ended December 31 2018 2019 2020 Mexico Ps. 12,046,208 Ps. 12,788,464 Ps. 14,911,208 Puerto Rico 686,067 747,755 664,046 Brazil 579,432 511,964 722,412 Europe 619,039 2,526,957 1,701,424 Ecuador 58,354 34,425 67,402 El Salvador 15,751 Nicaragua 3,711 13,989,100 Ps. 16,609,565 Ps. 18,085,954 a) Defined Benefit Plans The defined benefit obligation (DBO) and plan assets for the pension and other benefit obligation plans, by country, are as follows: At December 31 2019 2020 DBO Plan Assets Effect of Net employee DBO Plan Assets Effect of Net employee Mexico Ps. 280,602,176 Ps. (164,910,346 ) Ps. Ps. 115,691,830 Ps. 278,434,302 Ps. (150,090,481 ) Ps. Ps. 128,343,821 Puerto Rico 35,803,893 (22,575,301 ) 13,228,592 40,240,193 (25,315,319 ) 14,924,874 Brazil 21,412,097 (18,815,174 ) 4,428,021 7,024,944 18,568,932 (16,143,783 ) 3,393,640 5,818,789 Europe 4,538,543 4,538,543 5,490,873 5,490,873 Total Ps. 342,356,709 Ps. (206,300,821 ) Ps. 4,428,021 Ps. 140,483,909 Ps. 342,734,300 Ps. (191,549,583 ) Ps. 3,393,640 Ps. 154,578,357 Below is a summary of the actuarial results generated for the pension and retirement plans as well as the medical services in Puerto Rico and Brazil; the pension plans and seniority premiums related to Telmex; the pension plan, the service awards plan and severance in Austria corresponding to the years ended December 31, 2018, 2019 and 2020: At December 31, 2018 DBO Plan Assets Effect of asset Net employee Balance at the beginning of the year Ps. 329,113,625 Ps. (227,688,604 ) Ps. 6,519,560 Ps. 107,944,581 Current service cost 3,322,813 3,322,813 Interest cost on projected benefit obligation 30,185,257 30,185,257 Expected return on plan assets (20,804,104 ) (20,804,104 ) Changes in the asset ceiling during the period and others 587,373 587,373 Past service costs and other 157,765 157,765 Actuarial gain for changes in experience (7,222 ) (7,222 ) Actuarial loss from changes in demographic assumptions 134,625 134,625 Actuarial gain from changes in financial assumptions (24,890 ) (24,890 ) Net period cost Ps. 33,610,583 Ps. (20,646,339 ) Ps. 587,373 Ps. 13,551,617 Actuarial gain for changes in experience (21,283,470 ) (21,283,470 ) Actuarial loss from changes in demographic assumptions 68,482 68,482 Actuarial gain from changes in financial assumptions (1,246,539 ) (1,246,539 ) Changes in the asset ceiling during the period and others (1,055,409 ) (1,055,409 ) Return on plan assets greater than discount rate (shortfall) 23,503,296 23,503,296 Recognized in other comprehensive income Ps. (22,461,527 ) Ps. 23,503,296 Ps. (1,055,409 ) Ps. (13,640 ) Contributions made by plan participants 173,722 (173,722 ) — Contributions to the pension plan made by the Company (1,565,792 ) (1,565,792 ) Benefits paid (19,546,541 ) 19,546,541 — Payments to employees (10,651,938 ) (10,651,938 ) Effect of translation (3,535,477 ) 3,353,498 (963,981 ) (1,145,960 ) Others Ps. (33,560,234 ) Ps. 21,160,525 Ps. (963,981 ) Ps. (13,363,690 ) Balance at the end of the year 306,702,447 (203,671,122 ) 5,087,543 108,118,868 Less short-term portion (212,141 ) (212,141 ) Non-current Ps. 306,490,306 Ps. (203,671,122 ) Ps. 5,087,543 Ps. 107,906,727 At December 31, 2019 DBO Plan Assets Effect of asset Net Balance at the beginning of the year Ps. 306,702,447 Ps. (203,671,122 ) 5,087,543 Ps. 108,118,868 Current service cost 2,591,975 2,591,975 Interest cost on projected benefit obligation 31,001,348 31,001,348 Expected return on plan assets (20,070,037 ) (20,070,037 ) Changes in the asset ceiling during the period and others 445,743 445,743 Past service costs and others 144,481 144,481 Actuarial gain for changes in experience (22,599 ) (22,599 ) Actuarial gain from changes in demographic assumptions (129 ) (129 ) Actuarial loss from changes in financial assumptions 36,163 36,163 Net period cost Ps. 33,606,758 Ps. (19,925,556 ) Ps. 445,743 Ps. 14,126,945 Actuarial loss for changes in experience 31,606,323 31,606,323 Actuarial gain from changes in demographic assumptions (339,657 ) (339,657 ) Actuarial loss from changes in financial assumptions 7,207,072 7,207,072 Changes in the asset ceiling during the period and others (712,064 ) (712,064 ) Return on plan assets greater than discount rate (shortfall) 423,514 423,514 Recognized in other comprehensive income Ps. 38,473,738 Ps. 423,514 Ps. (712,064 ) Ps. 38,185,188 Contributions made by plan participants 155,188 (155,188 ) — Contributions to the pension plan made by the Company (1,337,610 ) (1,337,610 ) Benefits paid (15,836,928 ) 15,836,928 — Payments to employees (16,996,920 ) (16,996,920 ) Effect of translation (3,534,509 ) 2,528,213 (393,201 ) (1,399,497 ) Others Ps. (36,213,169 ) Ps. 16,872,343 Ps. (393,201 ) Ps. (19,734,027 ) Balance at the end of the year 342,569,774 (206,300,821 ) 4,428,021 140,696,974 Less short-term portion (213,065 ) (213,065 ) Non-current Ps. 342,356,709 Ps. (206,300,821 ) Ps. 4,428,021 Ps. 140,483,909 At December 31, 2020 DBO Plan Assets Effect of asset celling Net employee benefit liability Balance at the beginning of the year Ps. 342,569,774 Ps. (206,300,821 ) Ps. 4,428,021 Ps. 140,696,974 Current service cost 2,810,584 2,810,584 Interest cost on projected benefit obligation 30,482,173 30,482,173 Expected return on plan assets (17,655,119 ) (17, 655,119 ) Changes in the asset ceiling during the period and others 278,639 278,639 Past service costs and other 148,253 148,253 Actuarial gain for changes in experience (8,945 ) (8,945 ) Actuarial gain from changes in demographic assumptions (270 ) (270 ) Actuarial loss from changes in financial assumptions 20,219 20,219 Net period cost Ps. 33,303,761 Ps. (17,506,866 ) Ps. 278,639 Ps. 16,075,534 Actuarial gain for changes in experience (9,677 ) (9,677 ) Actuarial gain from changes in demographic assumptions (103,987 ) (103,987 ) Actuarial loss from changes in financial assumptions 3,475,345 3,475,345 Changes in the asset ceiling during the period and others (542,430 ) (542,430 ) Return on plan assets greater than discount rate (shortfall) 12,320,777 12,320,777 Actuarial loss from changes in demographic assumptions (924,084 ) (924,084 ) Recognized in other comprehensive income Ps. 2,437,597 Ps. 12320,777 Ps. (542,430 ) Ps. 14,215,944 Contributions made by plan participants 137,947 (137,947 ) — Contributions to the pension plan made by the Company (1,882,654 ) (1,882,654 ) Benefits paid (19,740,727 ) 19,740,727 — Payments to employees (14,426,720 ) (14,426,720 ) Effect of translation (1,278,392 ) 2,217,201 (770,590 ) 168,219 Others Ps. (35,307,892 ) Ps. 19,937,327 Ps. (770,590 ) Ps. (16,141,155 ) Balance at the end of the year 343,003,240 (191,549,583 ) 3,393,640 154,847,297 Less short-term portion (268,940 ) (268,940 ) Non-current Ps. 342,734,300 Ps. (191,549,583 ) Ps. 3,393,640 Ps. 154,578,357 In the case of other subsidiaries in Mexico, the net period cost of other employee benefits for the years ended December 31, 2018, 2019 and 2020 was Ps.(16,347) , Ps.49,050 and Ps.174,994, respectively. The balance of other employee benefits at December 31, 2019 and 2020 was Ps.845,830 and Ps.916,534, respectively. In the case of Brazil, the net period cost of other benefits for the years ended December 31, 2018, 2019 and 2020 was Ps.98,658, Ps.99,498 and Ps.268,562, respectively. The balance of employee benefits at December 31, 2019 and 2020 was Ps.2,402,285 and Ps.2,111,801, respectively. In the case of Ecuador, the net period cost of other benefits for the years ended December 31, 2018, 2019 and 2020 was Ps.58,354, Ps.34,425 and Ps.67,402, respectively. The balance of employee benefits at December 31, 2019 and 2020 was Ps.409,750 and Ps.488,161, respectively. In the case of Central America, the net period cost of other benefits for the years ended December 31, 2020 was Ps.19,462. The balance of employee benefits at December 31, 2020 was Ps.250,819. Plan assets are invested in: At December 31 2019 2020 Puerto Rico Brazil Mexico Puerto Rico Brazil Mexico Equity instruments 41 % — 64 % 43 % — 68 % Debt instruments 58 % 94 % 36 % 22 % 95 % 32 % Others 1 % 6 % — 35 % 5 % — 100 % 100 % 100 % 100 % 100 % 100 % Included in the Telmex’s net pension plan liability are plan assets of Ps.164,910,346 and Ps.150,090,481 as of December 31, 2019 and 2020, respectively, of which 31.9% and 39.6% during 2019 and 2020, respectively, were invested in equity and debt instruments of both América Movil and also of related parties, primarily entities that are under common control of the Company’s principal shareholder. The Telmex pension plan recorded a re-measurement The assumptions used in determining the net period cost were as follows: 2018 2019 2020 Puerto Brazil Mexico Europe Puerto Brazil Mexico Europe Puerto Brazil Mexico Europe 1.25%, 0.75%, 6.48% & 0.25%, 1.75% & 1.00% & 0.50% & Discount rate and long- term rate return 4.45% 9.10% 11.81% 2.00% 3.23% 7.03% 10.50% 1.25% 2.34% 7.39% 10.04% 0.75% 3.0.%, 3.00%, 3.00%, 3.5% & 3.5% & 3.5% & Rate of future salary increases 2.75% 4.00% 3.55% 4.40% 2.75% 3.80% 3.20% 4.40% 2.75% 3.25% 2.84% 4.10% Percentage of increase in health care costs for the coming year 3.87% 10.50% 3.18% 10.30% 2.28% 9.96% Year to which this level will be maintained N/A 2029 N/A 2029 N/A 2031 Rate of increase of pensions 1.60% 1.60% 1.60% Employee turnover rate* 0.0%-1.51% 0.00%-1.38% 0.00%-1.31% * Depending on years of service Biometric Puerto Rico: Mortality: RP 2014, MSS 2020 Tables. Disability: 1985 Pension Disability Table Brazil: Mortality: 2000 Basic AT Table for gender Disability for assets: UP 84 modified table for gender Disability retirement: 80 CSO Code Table Rotation: Probability of leaving the Company other than death, Disability and retirement is zero Europe Life expectancy in Austria is base on “AVÖ 2018-P Telmex Mortality: Mexican 2000 (CNSF) adjusted Disability: Mexican Social Security adjusted by Telmex experience Turnover: Telmex experience Retirement: Telmex experience For the year ended December 31, 2020, the Company conducted a sensitivity analysis on the most significant variables that affect the DBO, simulating independently, reasonable changes to roughly 100 basis points in each of these variables. The increase (decrease) would have resulted in the DBO pension and other benefits at December 31, 2020 are as follows: -100 points +100 points Discount rate Ps. 29,012,552 Ps. (25,541,956 ) Health care cost trend rat Ps. (665,934 ) Ps. 781,238 Telmex Plans Part of the Telmex´s employees are covered under defined benefit pension plans and seniority premiums. Pension benefits and seniority premiums are determined on the basis in their final year of employment, their seniority, and their age at the time of retirement. Telmex has set up an irrevocable trust fund to finance these employee benefits and has adopted the policy of making contributions to such fund when it is considered necessary. Europe Defined benefit pension plans A1 Telekom Austria Group provides defined benefits for certain former employees in Austria. All eligible employees are retired and were employed prior to January 1, 1975. This unfunded plan provides benefits based on a percentage of salary and years employed, not exceeding 80% of the salary before retirement, and taking into consideration the pension provided by the social security system. A1 Telekom Austria Group is exposed primarily to the risk of development of life expectancy and inflation because the benefits from pension plans are lifetime benefits. Furthermore, at December 31, 2020 and 2019, approximately 10% and 10%, respectively, of the obligation for pensions relate to the employees of the company Akenes in Lausanne, which was acquired in 2017. Service awards Civil servants and certain employees (in the following “employees”) are eligible to receive service awards. In accordance with the legal regulations, eligible employees receive a cash bonus of two months’ salary after 25 years of service and four months’ salary after 40 years of service. Employees with at least 35 years of service when retiring (at the age of 65) or who are retiring based on specific legal regulations are also eligible to receive the service award of four monthly salaries. The obligation is accrued over the period of service, taking into account the employee turnover rate of employees who leave service early. The main risk that A1 Telekom Austria Group is exposed to is the risk of development of salary increases and changes of interest rates. Severance Defined contribution plans Employees who started work for A1 Telekom Austria Group in Austria on or after January 1, 2003 are covered by a defined contribution plan. A1 Telekom Austria Group paid Ps.54,945 and Ps.66,294 (1.53% of the salary or wage) into this defined contribution plan (BAWAG Allianz Mitarbeitervorsorgekasse AG) in 2019 and 2020, respectively. Defined benefit plans Severance benefit obligations for employees hired before January 1, 2003, excluding civil servants, are covered by defined benefit plans. Upon termination by A1 Telekom Austria Group or retirement, eligible employees receive severance payments. Depending on their time in service, their severance is equal to a multiple of their monthly basic compensation plus variable elements such as overtime or bonuses, with a maximum of twelve monthly salaries. In case of death, the heirs of eligible employees receive 50% of the severance benefits. The primary risks to A1 Telekom Austria Group are salary increases and changes of interest rates. b) Defined Contribution Plans Brazil Claro makes contributions to the DCP through Embratel Social Security Fund – Telos. Contributions are computed based on the salaries of the employees, who decide on the percentage of their contributions to the plan (participants enrolled before October 31st, 2014 is from 1% to 8% and, for those subscribed after that date, the contribution is from 1% to 7% of their salaries). Claro contributes the same percentage as the employee, capped at 8% of the participant’s balance for the employees that are eligible to participate in this plan. At December 31, 2019 and 2020, the balance of the DCP liability was Ps.76,509 and Ps, 980,014 respectively. For the years ended December 31, 2018, 2019 and 2020 the cost of labor were Ps.2,377, Ps.3,365 and Ps.2,930, respectively. Europe In Austria, pension benefits are generally provided by the social security system for employees, and by the government for civil servants. The contributions of 12.55% that A1 Telekom Austria Group made in 2019 and 2020 to the social security system and the government in Austria, amount to Ps.1,334,713 and Ps.1,474,721, respectively. Contributions of the foreign subsidiaries into the respective systems range between 7% and 29% and amount to Ps.530,888 and Ps.601,476 in 2019 and 2020, respectively. Additionally, A1 Telekom Austria Group offers a defined contribution plan for employees of some of its Austrian subsidiaries. A1 Telekom Austria Group’s contributions to this plan are based on a percentage of the compensation not exceeding 5%. The annual expenses for this plan amounted to Ps.281,693 and Ps.295,567 in 2019 and 2020, respectively. As of December 31, 2019 and 2020 the liability related to this defined contribution plan amounted to Ps.111,724 and Ps.134,034, respectively. Other countries For the rest of the countries where the Company operates and that do not have defined benefit plans or defined contribution plans, the Company makes contributions to the respective governmental social security agencies which are recognized in results of operations as they are incurred. c) Long-term direct employee benefits Balance at Effect of Increase of Applications Balance at Payments Reversals Long-term direct employee benefits Ps. 8,111,778 Ps. (518,180 ) Ps.2,528,224 Ps.(1,946,055 ) Ps. Ps.8,175,767 Balance at December 31, 2019 Effect of translation Increase of the year Applications Balance at December 31, 2020 Payments Reversals Long-term direct employee benefits Ps. 8,175,767 Ps. 1,256,880 Ps.1,729,392 Ps.(2,411,436 ) Ps. Ps.8,750,603 In 2008, a comprehensive restructuring program was initiated in the segment Austria. The provision for restructuring includes future compensation of employees who will no longer provide services for A1 Telekom Austria Group but who cannot be laid off due to their status as civil servants. These employment contracts are onerous contracts under IAS 37, as the unavoidable cost related to the contractual obligation exceeds the future economic benefit. The restructuring program also includes social plans for employees whose employment will be terminated in a socially responsible way. In 2009 and every year from 2011 to 2019, new social plans were initiated that provide for early retirement, special severance packages and golden handshake options. Due to their nature as termination benefits, these social plans are accounted for according to IAS 19.

Financial Assets and Liabilitie

Financial Assets and Liabilities	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Financial Assets and Liabilities	19. Financial Assets and Liabilities Set out below is the categorization of the financial instruments, excluding cash and cash equivalents, held by the Company as of December 31, 2019 and 2020: December 31, 2019 Loans and Receivables Fair value through profit or loss Fair value through OCI Financial Assets: Equity investments at fair value through OCI and other short term investments Ps. 10,145,615 Ps. — Ps. 37,572,410 Accounts receivable from subscribers, distributors, contractual assets and other 196,217,010 — — Related parties 1,273,140 — — Derivative financial instruments — 6,825,760 — Total Ps. 207,635,765 Ps. 6,825,760 Ps. 37,572,410 Financial Liabilities: Debt Ps. 624,254,477 Ps. — Ps. — Liability related to right-of-use 120,596,733 — — Accounts payable 216,112,824 — — Related parties 3,460,419 — — Derivative financial instruments — 9,596,751 — Total Ps. 964,424,453 Ps. 9,596,751 Ps. — December 31, 2020 Loans and Receivables Fair value through profit or loss Fair value through OCI Financial Assets: Equity investments at fair value through OCI and other short term investments Ps. 4,603,284 Ps. — Ps. 50,033,111 Accounts receivable from subscribers, distributors, contractual assets and other 171,213,415 — — Related parties 1,391,300 — — Derivative financial instruments — 20,928,335 — Total Ps. 177,207,999 Ps. 20,928,335 Ps. 50,033,111 Financial Liabilities: Debt Ps. 628,382,956 Ps. — Ps. — Liability related to right-of-use 109,327,241 — — Accounts payable 186,995,472 — — Related parties 3,999,916 — — Derivative financial instruments — 14,230,249 — Total Ps. 928,705,585 Ps. 14,230,249 Ps. — Fair value hierarchy The Company’s valuation techniques used to determine and disclose the fair value of its financial instruments are based on the following hierarchy: Level 1: Quoted prices (unadjusted) in active markets for identical assets or liabilities; Level 2: Variables other than quoted prices in Level 1 that are observable for the asset or liability, either directly (prices) or indirectly (derived from prices); and Level 3: Variables used for the asset or liability that are not based on any observable market data (non-observable The fair value for the financial assets (excluding cash and cash equivalents) and financial liabilities shown in the consolidated statements of financial position at December 31, 2019 and 2020 is as follows: Measurement of fair value at December 31, 2019 Level 1 Level 2 Level 3 Total Assets: Equity investments at fair value through OCI and other short-term investments Ps. 37,572,410 Ps. 10,145,615 Ps. — Ps. 47,718,025 Derivative financial instruments — 6,825,760 — 6,825,760 Pension plan assets 185,981,861 20,294,557 24,403 206,300,821 Total Ps. 223,554,271 Ps. 37,265,932 Ps. 24,403 Ps. 260,844,606 Liabilities: Debt Ps. 582,003,256 Ps. 101,667,421 Ps. — Ps. 683,670,677 Liability related to right-of-use of assets 120,596,733 — — 120,596,733 Derivative financial instruments — 9,596,751 — 9,596,751 Total Ps. 702,599,989 Ps. 111,264,172 Ps. — Ps. 813,864,161 Measurement of fair value at December 31, 2020 Level 1 Level 2 Level 3 Total Assets: Equity investments at fair value through OCI and other short-term investments Ps. 50,033,111 Ps. 4,603,284 Ps. — Ps. 54,636,395 Derivative financial instruments — 20,928,335 — 20,928,335 Revalued of assets — — 107,152,628 107,152,628 Pension plan assets 168,939,091 22,589,392 21,100 191,549,583 Total Ps. 218,972,202 Ps. 48,121,011 Ps. 107,173,728 Ps. 374,266,941 Liabilities: Debt Ps. 578,712,562 Ps. 135,645,912 Ps. — Ps. 714,358,474 Liability related to right-of-use of assets 109,327,241 — — 109,327,241 Derivative financial instruments — 14,230,249 — 14,230,249 Total Ps. 688,039,803 Ps. 149,876,161 Ps. — Ps. 837,915,964 Fair value of derivative financial instruments is valued using valuation techn i h The fair value of the asset revaluation was calculated using valuation techniques, using observable market data and internal information on transactions carried out with independent third parties. To determine fair value we use level 2 and 3 information, the Company used inputs such as average rents, contract term and discount rates for discounted flow modeling techniques; in the case of discount rates, we use level 2 data where the information is public and is found in recognized databases, such as country risks, inflation, etc. In the case of average rents and contract terms, we use level 3 data, where the information is mainly internal based on lease contracts entered into with independent third parties. During the end of the period ended December 31, 2019 and 2020, there were no transfers between the Level 1 and Level 2 fair value measurement hierarchies. Changes in liabilities arising from financing activities At December 31, At January 1, 2019 Cash flow Foreign currency exchange and other At December 31, 2019 Debt 638,922,453 — 8,273,440 (22,941,416 ) 624,254,477 Liability related to right-of-use — 119,387,660 (26,765,075 ) 27,974,148 120,596,733 Total liabilities from financing activities Ps. 638,922,453 Ps. 119,387,660 Ps. (18,491,635 ) Ps. 5,032,732 Ps. 744,851,210 At December 31, Cash flow Foreign currency exchange and other At December 31, 2020 Debt 624,254,477 (53,091,801 ) 57,220,280 628,382,956 Liability related to right-of-use 120,596,733 (29,623,565 ) 18,354,073 109,327,241 Total liabilities from Ps.744,851,210 Ps.(82,715,366 ) Ps.75,574,353 Ps.737,710,197

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Shareholders' Equity	20. Shareholders’ Equity a) Ley del Mercado de Valores b) c) Ley del Mercado de Valores Disposiciones de carácter general aplicables a las emisoras de valores y a otros participantes en el Mercado de valores Comisión Nacional Bancaria y de Valores, d) Registro Nacional de Valores The Company’s bylaws contain restrictions and limitations related to the subscription and acquisition of “AA” shares by non-Mexican e) “A” shares, which may be freely subscribed, must not represent more than 19.6% of capital stock and must not exceed 49% of the common shares representing such capital. Common shares (entitled to full voting rights, represented by “AA” and “A” shares), must represent no more than 51% of the Company’s capital stock. Lastly, “L” shares which have limited voting rights and may be freely subscribed may not exceed, along with “A” shares, 80% of the Company’s capital stock. For purposes of determining these restrictions, the percentages mentioned above refer only to the number of the Company’s shares outstanding. Dividends On April 24, 2020, the Company’s shareholders approved, among other resolutions, the payment of a dividend of Ps.$0.38 (thirty-eight peso cents) per share to each of the shares series of its capital stock “AA”, “A” and “L”. It was approved, that such dividend would be paid in two installments of Ps.$0.19 (nineteen peso cents) each, on July 20 and November 09, 2020 respectively. On April 9, 2019, the Company’s shareholders approved, among other resolutions, the payment of a dividend of Ps.$0.35 (thirty-five peso cents) per share to each of the shares series of its capital stock “AA”, “A” and “L”. It was approved, that such dividend would be paid in two installments of Ps.$0.18 (eighteen peso cents) and Ps.$0.17 (seventeen peso cents), on July 15 and November 11, 2019 respectively. Legal Reserve According to the Ley General de Sociedades Mercantiles Restrictions on Certain Transactions Pursuant to the Company’s bylaws any transfer of more than 10% of the full voting shares (“A” shares and “AA” shares), effected in one or more transactions by any person or group of persons acting in concert, requires prior approval by our Board of Directors. If the Board of Directors denies such approval, however, the Company bylaws require it to designate an alternate transferee, who must pay market price for the shares as quoted on the Bolsa Mexicana de Valores, S.A.B. de C.V. Payment of Dividends Dividends, either in cash or in kind, paid with respect to the “A” Shares, “L” Shares, “A” Share ADSs or “L” Share ADSs will generally be subject to a 10% Mexican withholding tax (provided that no Mexican withholding tax will apply to distributions of net taxable profits generated before 2015). Nonresident holders could be subject to a lower tax rate, to the extent that they are eligible for benefits under an income tax treaty to which Mexico is a party. Earnings per Share The following table shows the computation of the basic and diluted earnings per share: For the years ended December 31, 2018 2019 2020 Net profit for the period attributable to equity holders of the parent Ps. 52,566,197 Ps. 67,730,891 Ps. 46,852,605 Weighted average shares (in millions) 66,055 66,016 66,265 Earnings per share attributable to equity holders of the parent Ps. 0.79 Ps. 1.03 Ps. 0.71

Components of Other Comprehensi

Components of Other Comprehensive Loss	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Components of other comprehensive loss	21. Components of other comprehensive loss The movement on the components of the other comprehensive (loss) income for the years ended December 31, 2018, 2019 and 2020 is as follows: For the years ended December 31, 2018 2019 2020 Controlling interest: Unrealized (loss) gain on equity investments at fair value, net of deferred taxes (3,765,688 ) 883,408 (1,952,414 ) Translation effect of foreign entities (61,223,458 ) (34,010,066 ) (13,558,774 ) Remeasurement of defined benefit plan, net of deferred taxes 652,722 (29,153,554 ) (10,026,454 ) Assets revaluation surplus net of deferred taxes — — 64,835,155 Non-controlling (2,986,018 ) (1,908,304 ) 14,165,249 Other comprehensive (loss) income Ps.(67,322,442 ) Ps.(64,188,516 ) Ps.53,462,762

Valuation of derivatives, inter

Valuation of derivatives, interest cost from labor obligations and other financial items, net	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Valuation of derivatives, interest cost from labor obligations and other financial items, net	22. Valuation of derivatives, interest cost from labor obligations and other financial items, net For the years ended December 31, 2018, 2019 and 2020, valuation of derivatives and other financial items are as follows: For the years ended December 31, 2018 2019 2020 Controlling interest: (Loss) gain in valuation of derivatives, net Ps. (4,686,407 ) Ps. 4,432,023 Ps. 12,378,193 Capitalized interest expense (Note 10 b) 2,020,288 2,233,358 1,771,613 Commissions (1,901,473 ) (2,820,477 ) (1,135,082 ) Interest cost of labor obligations (Note 18) (9,968,526 ) (11,377,054 ) (13,105,693 ) Interest expense on taxes (555,921 ) (516,522 ) (59,032 ) Dividend received (Note 4) 2,605,333 1,773,336 2,122,826 Gain on net monetary positions 4,429,145 4,267,194 3,262,512 Other financial cost (2,118,755 ) (5,067,200 ) (3,944,229 ) Total Ps. (10,176,316 ) Ps. (7,075,342 ) Ps. 1,291,108

Segments

Segments	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Segments	23. Segments América Móvil operates in different countries. As mentioned in Note 1, the Company has operations in Mexico, Guatemala, Nicaragua, Ecuador, El Salvador, Costa Rica, Brazil, Argentina, Colombia, United States, Honduras, Chile, Peru, Paraguay, Uruguay, Dominican Republic, Puerto Rico, Panama, Austria, Croatia, Bulgaria, Belarus, Macedonian, Serbia and Slovenia. The accounting policies for the segments are the same as those described in Note 2. The Chief Executive Officer, who is the Chief Operating Decision Maker (“CODM”), analyzes the financial and operating information by operating segment. All operating segments that (i) represent more than 10% of consolidated revenues, (ii) more than the absolute amount of its reported 10% of profits before income tax or (iii) more than 10% of consolidated assets, are presented separately. The Company presents the following reportable segments for the purposes of its consolidated financial statements: Mexico (includes Telcel and Corporate operations and assets), Telmex (Mexico), Brazil, Southern Cone (includes Argentina, Chile, Paraguay and Uruguay), Central America (includes Guatemala, El Salvador, Honduras, Nicaragua, Costa Rica and Panama), U.S.A. (excludes Puerto Rico), Caribbean (includes Dominican Republic and Puerto Rico), and Europe (includes Austria, Bulgaria, Croatia, Belarus, Slovenia, Macedonia and Serbia). The segment Southern Cone comprises mobile communication services in Argentina as well as Chile, Paraguay and Uruguay. Beginning in 2018, hyperinflation accounting in accordance with IAS 29 was initially applied to Argentina, which results in the restatement of non-monetary period-end The Company considers that the quantitative and qualitative aspects of any aggregated operating segments (that is, Central America and Caribbean reportable segments) are similar in nature for all periods presented. In evaluating the appropriateness of aggregating operating segments, the key indicators considered included but were not limited to: (i) the similarity of key financial statements measures and trends, (ii) all entities provide telecommunications services, (iii) similarities of customer base and services, (iv) the methods to distribute services are the same, based on telephone plant in both cases, wireless and fixed lines, (v) similarities of governments and regulatory entities that oversee the activities and services of telecom companies, (vi) inflation trends, and (vii) currency trends. Mexico Telmex Brazil Southern Cone Colombia Andean Central America U.S.A. Caribbean Europe Eliminations Consolidated total As of and for the year ended December 31, 2018 (in Ps.): External revenues 207,610,244 86,339,289 188,712,666 89,149,978 75,460,428 55,633,192 44,883,585 153,266,315 36,435,541 100,716,443 — 1,038,207,681 Intersegment revenues 16,946,543 9,741,908 4,593,760 13,200,358 344,517 154,082 149,445 — 204,294 — (45,334,907 ) — Total revenues 224,556,787 96,081,197 193,306,426 102,350,336 75,804,945 55,787,274 45,033,030 153,266,315 36,639,835 100,716,443 (45,334,907 ) 1,038,207,681 Depreciation and amortization 17,619,342 18,358,248 42,857,751 13,526,361 13,464,867 8,516,960 8,940,655 1,545,395 5,036,831 26,838,972 (992,802 ) 155,712,580 Operating income (loss) 57,450,599 8,085,764 23,494,903 16,975,797 14,388,552 5,003,915 4,867,763 2,665,270 5,811,846 4,731,562 (3,918,800 ) 139,557,171 Interest income 26,578,280 420,380 11,303,888 2,251,474 1,013,839 1,666,879 1,566,086 559,548 1,458,874 122,133 (36,295,212 ) 10,646,169 Interest expense 32,526,258 1,153,913 20,377,191 4,338,941 2,913,881 1,719,663 509,081 — 561,867 1,973,431 (34,302,793 ) 31,771,433 Income tax 28,842,505 643,377 4,026,444 1,390,039 2,251,877 2,498,666 2,533,600 810,898 2,774,204 707,093 (1,624 ) 46,477,079 Equity interest in net income (loss) of associated companies (5,962 ) 44,965 (152 ) (20,871 ) — — — — — (17,713 ) — 267 Net profit (loss) attributable to equity holders of the parent 23,185,029 (2,201,572 ) 3,530,653 6,065,703 9,165,801 1,730,933 2,821,733 2,820,505 3,644,697 3,809,694 (2,006,979 ) 52,566,197 Assets by segment 970,564,314 174,461,398 390,791,480 127,946,573 111,975,598 96,347,779 81,640,157 38,814,907 102,531,547 186,135,358 (851,985,719 ) 1,429,223,392 Plant, property and equipment, net 56,056,634 103,737,293 173,197,708 62,988,635 51,422,548 35,800,477 37,146,601 1,356,237 38,011,242 80,421,642 (138,297 ) 640,000,720 Goodwill 27,104,632 215,381 21,388,124 2,796,759 12,770,380 5,242,365 5,466,871 3,328,533 14,186,723 53,066,729 — 145,566,497 Trademarks, net 227,774 243,556 124,910 — — — — 507,033 249,984 3,313,948 — 4,667,205 Licenses and rights, net 10,573,147 — 25,873,910 12,555,496 3,400,235 9,651,582 3,605,416 — 10,294,336 27,344,273 — 103,298,395 Investment in associated companies 5,621,661 563,667 543 20,697 412 — 24,262 — — 748,674 (3,847,209 ) 3,132,707 Liabilities by segments 748,965,728 136,993,838 298,308,084 94,550,901 56,211,438 50,064,761 28,592,953 35,552,678 58,716,154 117,214,746 (441,820,311 ) 1,183,350,970 Mexico Telmex Brazil Southern Cone Colombia Andean Central America U.S.A. Caribbean Europe Eliminations Consolidated total As of and for the year ended December 31, 2019 (in Ps.): External revenues 226,164,232 84,173,980 177,596,077 54,230,682 74,274,684 55,440,675 46,602,036 155,864,392 34,580,822 98,420,289 — 1,007,347,869 Intersegment revenues 11,676,015 11,863,364 4,182,248 11,041,705 361,386 92,249 132,061 — 1,136,879 — (40,485,907 ) — Total revenues 237,840,247 96,037,344 181,778,325 65,272,387 74,636,070 55,532,924 46,734,097 155,864,392 35,717,701 98,420,289 (40,485,907 ) 1,007,347,869 Depreciation and amortization 24,742,622 16,346,927 39,424,474 13,847,506 13,439,489 10,256,129 11,045,817 1,396,422 6,322,648 24,975,146 (2,881,970 ) 158,915,210 Operating income (loss) 67,694,409 9,731,852 28,846,565 4,007,614 15,324,977 8,023,002 5,712,068 2,968,236 5,741,368 8,687,862 (1,897,418 ) 154,840,535 Interest income 23,713,455 1,839,973 3,155,681 896,256 1,306,571 1,283,788 532,046 324,932 1,478,560 115,359 (28,361,949 ) 6,284,672 Interest expense 30,972,658 1,439,785 19,021,965 3,849,318 2,952,123 2,422,887 1,406,720 385 1,435,862 2,220,168 (27,810,532 ) 37,911,339 Income tax 30,000,511 1,528,229 4,251,116 2,022,336 5,405,452 1,681,159 2,355,380 1,119,478 719,774 1,946,255 3,843 51,033,533 Equity interest in net income (loss) of associated companies (3,732 ) 46,789 (1,538 ) (23,424 ) — — (28,795 ) — — (6,909 ) — (17,609 ) Net profit (loss) attributable to equity holders of the parent 42,598,946 (1,705,068 ) 5,618,095 (6,984 ) 9,571,046 (2,604,646 ) 2,335,963 2,095,807 4,312,630 5,051,145 463,957 67,730,891 Assets by segment 915,233,048 201,283,526 382,561,753 132,722,497 115,851,227 94,021,632 77,355,732 30,775,893 100,694,650 191,744,924 (710,311,225 ) 1,531,933,657 Plant, property and equipment, net 54,589,459 106,869,482 174,761,167 60,537,650 50,133,642 39,068,450 38,934,747 1,405,755 38,223,641 75,707,738 (888,361 ) 639,343,370 Goodwill 27,396,393 215,381 25,379,805 5,241,305 12,124,685 4,895,331 7,289,748 3,220,105 14,186,723 52,950,325 — 152,899,801 Trademarks, net 46,476 212,324 37,207 — — — — 369,950 227,156 2,595,596 — 3,488,709 Licenses and rights, net 11,087,882 452,504 29,324,718 12,103,980 5,530,422 8,064,487 4,390,547 — 7,942,670 25,951,335 — 104,848,545 Investment in associated companies 3,562,323 610,807 111,073 (7,806 ) 391 — 25,603 — — — (1,828,198 ) 2,474,193 Liabilities by segments 718,354,229 175,774,964 297,877,328 103,330,525 55,576,253 55,463,339 37,993,180 31,557,816 54,276,868 124,319,541 (349,497,251 ) 1,305,026,792 Mexico Telmex Brazil Southern Cone Colombia Andean Central America U.S.A. Caribbean Europe Eliminations Consolidated total As of and for the year ended December 31, 2020 (in Ps.): External revenues 214,578,601 77,920,910 163,865,421 55,484,744 77,282,658 53,846,358 48,073,436 177,179,369 37,182,842 111,472,191 — 1,016,886,530 Intersegment revenues 17,663,525 13,668,264 4,207,466 1,220,100 352,694 88,305 121,580 — 1,440,983 — (38,762,917 ) — Total revenues 232,242,126 91,589,174 168,072,887 56,704,844 77,635,352 53,934,663 48,195,016 177,179,369 38,623,825 111,472,191 (38,762,917 ) 1,016,886,530 Depreciation and amortization 24,748,756 13,341,479 41,795,397 13,095,004 14,413,760 11,447,356 14,355,899 1,561,284 7,094,331 25,593,204 (3,202,787 ) 164,243,683 Operating income (loss) 70,851,525 11,204,433 25,203,504 1,877,079 15,111,947 8,698,645 4,004,501 10,579,394 6,701,086 13,159,865 (2,037,068 ) 165,354,911 Interest income 21,322,406 1,479,021 2,904,430 980,581 822,447 1,049,261 1,130,767 77,235 1,105,420 90,746 (25,900,278 ) 5,062,036 Interest expense 30,936,195 1,306,867 17,976,227 3,334,966 2,586,708 2,223,478 1,559,917 255 1,658,619 2,546,255 (25,467,747 ) 38,661,740 Income tax 4,905,863 577,178 (4,442,598 ) 992,831 2,078,789 3,115,693 1,518,953 2,856,881 2,524,214 2,234,065 4,283 16,366,152 Equity interest in net income (loss) of associated companies (3,820 ) 23,955 (2,972 ) (15,422 ) — — — — — (288,747 ) — (287,006 ) Net profit (loss) attributable to equity holders of the parent 3,613,907 (1,085,038 ) 4,963,424 1,456,062 16,579,303 4,649,047 1,919,558 7,797,723 3,294,111 7,777,426 (4,112,918 ) 46,852,605 Assets by segment 947,396,510 203,081,314 386,982,711 118,266,380 132,210,369 101,717,708 88,690,683 35,083,285 109,914,293 239,583,759 (737,878,785 ) 1,625,048,227 Plant, property and equipment, net 52,117,395 110,751,083 145,307,497 62,157,797 48,876,853 36,102,261 37,855,227 1,761,595 39,128,447 82,595,077 (876,229 ) 615,777,003 Revalued of assets — — 36,076,207 7,494,408 12,893,284 9,500,708 7,059,247 — 2,572,504 31,556,270 — 107,152,628 Goodwill 26,949,185 215,381 16,048,092 5,436,675 12,253,743 4,866,363 6,345,659 3,362,899 14,186,723 53,388,139 — 143,052,859 Trademarks, net 126,823 181,094 — — — — — 269,325 219,087 2,981,089 — 3,777,418 Licenses and rights, net 12,017,318 100,623 26,171,345 12,099,873 12,363,039 6,870,531 5,427,857 — 8,616,880 27,963,250 — 111,630,716 Investment in associated companies 51,645 613,449 64,125 (20,970 ) 395 — 25,413 — — — 1,095,703 1,829,760 Liabilities by segments 725,408,198 193,840,756 263,989,566 61,786,265 63,610,642 53,379,366 34,252,511 33,141,315 60,839,340 138,747,621 (319,064,971 ) 1,309,930,609

Recently Issued Accounting Stan

Recently Issued Accounting Standards	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Recently Issued Accounting Standards	24. Recently Issued Accounting Standards New and amended standards and interpretations The Company applied for the first-time certain standards and amendments, which are effective for annual periods beginning on or after 1 January 2020. The Company has not early adopted any other standard, interpretation or amendment that has been issued but is not yet effective. Amendments to IFRS 3, Definition of a Business The amendment to IFRS 3 Business Combinations Amendments to IFRS 7, IFRS 9 and IAS 39 Interest Rate Benchmark Reform The amendments to IFRS 9 and IAS 39 Financial Instruments: Recognition and Measurement provide a number of reliefs, which apply to all hedging relationships that are directly affected by interest rate benchmark reform. A hedging relationship is affected if the reform gives rise to uncertainty about the timing and/or amount of benchmark-based cash flows of the hedged item or the hedging instrument. These amendments have no impact on the consolidated financial statements of the Company as it does not have any interest rate hedge relationships. Amendments to IAS 1 and IAS 8 Definition of Material The amendments provide a new definition of material that states, “information is material if omitting, misstating or obscuring it could reasonably be expected to influence decisions that the primary users of general purpose financial statements make on the basis of those financial statements, which provide financial information about a specific reporting entity.” The amendments clarify that materiality will depend on the nature or magnitude of information, either individually or in combination with other information, in the context of the financial statements. A misstatement of information is material if it could reasonably be expected to influence decisions made by the primary users. These amendments had no impact on the consolidated financial statements of, nor is there expected to be any future impact to the Company. Conceptual Framework for Financial Reporting issued on 29 March 2018 The Conceptual Framework is not a standard, and none of the concepts contained therein override the concepts or requirements in any standard. The purpose of the Conceptual Framework is to assist the IASB in developing standards, to help preparers develop consistent accounting policies where there is no applicable standard in place and to assist all parties to understand and interpret the standards. This will affect those entities which developed their accounting policies based on the Conceptual Framework. The revised Conceptual Framework includes some new concepts, updated definitions and recognition criteria for assets and liabilities and clarifies some important concepts. These amendments had no impact on the consolidated financial statements of the Company.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Subsequent Events	25. Subsequent Events a) In February 2021, The Board of Directors approved a plan to spin-off spin-off co-location b) In February, 2021, the Company announces that its wholly-owned Dutch subsidiary América Móvil B.V. (the “Issuer”) has completed the placement of approximately EUR 2.1 billion principal amount of senior unsecured bonds (the “Bonds”) exchangeable into ordinary shares of Koninklijke KPN N.V. (the “Exchangeable Bond Offering”). The Bonds will have a maturity of 3 years, they will not bear interest (zero-coupon) yield-to-maturity

Basis of Preparation of the C_2

Basis of Preparation of the Consolidated Financial Statements and Summary of Significant Accounting Policies and Practices (Policies)	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Basis of preparation	a) Basis of preparation The accompanying consolidated financial statements have been prepared in conformity with International Financial Reporting Standards, as issued by the International Accounting Standards Board (“IASB”) (hereafter referred to as IFRS). The consolidated financial statements have been prepared on the historical cost basis, except for the derivative financial instruments, the mobile telecommunications towers, the trust assets of post-employment and other employee benefit plans and the investments in equity at fair value through other comprehensive income (OCI), which are presented at their market value. Effective July 1, 2018, the Argentinian economy has been considered to be hyperinflationary in accordance with the criteria in IAS 29 “Financial Reporting in Hyperinflationary Economies” (“IAS 29”). Accordingly, for the Argentinian subsidiaries, we have included, adjustments for hyperinflation and reclassifications as is required by the standard for purposes of presentation of IFRS in the consolidated financial statements. The preparation of these consolidated financial statements under IFRS requires the use of critical estimates and assumptions that affect the amounts reported for certain assets, liabilities, income and expenses, including the main impact generated by the COVID-19 The Mexican peso is the functional currency of the Company’s Mexican operations and the consolidated reporting currency of the Company. i) Changes in Accounting Policies and Disclosures Amendments to IFRS 16 Covid-19 On 28 May 2020, the IASB issued Covid-19-Related Covid-19 Covid-19 Covid-19 The amendment applies to annual reporting periods beginning on or after 1 June 2020. Earlier application is permitted. This amendment had no significant impact on the consolidated financial statements of the Company (See Note 15). Revaluation of telecommunications towers (plant, property and equipment) As of December 31, 2020, the company changed its accounting policy to record the value of the passive infrastructure (towers) of its subsidiaries. With the change, this passive infrastructure was no longer recognized at historical cost and it began to be recognized under the revaluation model (market value). The company considers that the revaluation model represents the actual conditions of the industry of this class of assets and improves its financial position, this allows its shareholders and stakeholders to have the necessary financial information associated with market expectations about this class of assets. The incremental effect on passive infrastructure is Ps.107,152,628. The first time application of an asset revaluation policy is a change in accounting policy that must be treated as a revaluation in accordance with IAS 16, this implies that it is not necessary to restructure the book value of previous periods, therefore, the adoption of this method will be carried out prospectively. ii) Basis of consolidation The consolidated financial statements include the accounts of América Móvil, S.A.B. de C.V. and those subsidiaries over which the Company exercises control. The consolidated financial statements for the subsidiaries were prepared for the same period as the Company´s and applying consistent accounting policies. All of the subsidiary companies operate in the telecommunications sector or related. Subsidiaries are entities over which the Company has control. Control is achieved when the Company has power over the investee, when it is exposed to, or has rights to, variable returns from its involvement with the investee, and has the ability to use its power over the investee to affect the amount of the investor’s returns. Subsidiaries are consolidated on a line by line basis from the date which control is achieved by the Company. The Company reassesses whether or not it controls an investee if facts and circumstances indicate that there are changes to one or more of the elements of control. On March 6, 2020, in accordance with a resolution of the Federal Telecommunications Institute (Instituto Federal de Telecomunicaciones or IFT), the subsidiaries Teléfonos de México, S.A.B. de C.V. and Teléfonos del Noroeste, S.A. de C.V. created separate companies related to the wholesale services named Red Nacional Última Milla S.A.P.I. de C.V., Servicios de Telecomunicaciones Ultima Milla, S.A. de C.V. and Red Última Milla del Noroeste S.A.P.I. de C.V. The restructuring of Telmex has no impact in the consolidated financial information of the Company. Changes in the Company’s ownership interests in a subsidiary that do not result in the Company losing control over the subsidiary are accounted for as equity transactions. The carrying amounts of the equity attributable to owners of the parent and non-controlling non-controlling Subsidiaries are deconsolidated from the date which control ceases. When the Company ceases to have control over a subsidiary, it derecognizes the assets (including any goodwill) and liabilities of the subsidiary at their carrying amounts, derecognizes the carrying amount of non-controlling All intra-Company balances and transactions, and any unrealized gains and losses arising from intra-Company transactions, are eliminated in preparing the consolidated financial statements. Non-controlling Non-controlling Associates: An associate is an entity over which the Company has significant influence. Significant influence is the power to participate in the financial and operating policy decisions of the investee but does not have control or joint control over those decisions. The Company’s investment in associates includes goodwill identified on acquisition, net of any accumulated impairment losses. The investments in associated companies in which the Company exercises significant influence are accounted for using the equity method, whereby Company recognizes its share in the net profit (losses) and equity of the associate. The results of operations of the subsidiaries and associates are included in the Company’s consolidated financial statements beginning as of the month following their acquisition and its share of other comprehensive income after acquisition is recognized directly in other comprehensive income. The Company assesses at each reporting date whether there is objective evidence that investment in associates is impaired. If so, the Company calculates the amount of impairment as the difference between the recoverable amount of the associate and its carrying value. The equity interest in the most significant subsidiaries at December 31, 2019 and 2020 is as follows: Company name Country Equity interest at December 31 2019 2020 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 % 100.0 % Nextel Telecomunicações Ltda b) Brazil 100.0 % 100.0 % Telecomunicaciones de Guatemala, S.A. (“Telgua”) b) Guatemala 99.3 % 99.3 % Claro Guatemala, S.A. b) Guatemala 100.0 % 100.0 % Empresa Nicaragüense de Telecomunicaciones, S.A. (“Enitel”) b) Nicaragua 99.6 % 99.6 % Compañía de Telecomunicaciones de El Salvador, S.A. de C.V. b) El Salvador 95.8 % 95.8 % Comunicación Celular, S.A. (“Comcel”) b) Colombia 99.4 % 99.4 % 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 iii) Basis of translation of financial statements of foreign subsidiaries and associated companies The operating revenues of foreign subsidiaries jointly represent approximately 73%, 71% and 72% of consolidated operating revenues for the years ended December 31, 2018, 2019 and 2020, respectively, and their total assets jointly represent approximately 73% and 75% of consolidated total assets at December 31, 2019 and 2020, respectively. The financial statements of foreign subsidiaries have been prepared under or converted to IFRS in the respective local currency (which is their functional currency) and then translated into the Company’s reporting currency as follows: • all monetary assets and liabilities were translated at the closing exchange rate of the period; • all non-monetary • equity accounts are translated at the exchange rate at the time the capital contributions were made and the profits were generated; • revenues, costs and expenses are translated at the average exchange rate of the period, except for the operations of the subsidiaries in Argentina, whose economy is considered hyperinflationary since 2018; • the consolidated statements of cash flows presented using the indirect method were translated using the weighted-average exchange rate for the applicable period (except for Argentina), and the resulting difference is shown in the consolidated statements of cash flows under the heading “Adjustment to cash flows due to exchange rate fluctuations, net”. The basis of translation for the operations of the subsidiaries in Argentina are described: In recent years, the Argentina economy has shown high rates of inflation. Although inflation data has not been consistent in recent years and several indexes have coexisted, inflation in Argentina indicates that the three-year cumulative inflation rate exceeded 100% in 2018, which is one of the quantitative references established by IAS 29. As a result, Argentina was considered a hyperinflationary economy in 2018 and the Company applies hyperinflation accounting to its subsidiary whose functional currency is the Argentine peso for financial information for periods ending on or after July 1, 2018, however the calculation of the cumulative impact was measured as of January 1, 2018. In order to restate for hyperinflation its financial statements, the subsidiary used the series of indices defined by resolution JG No. 539/18 issued by the “Federación Argentina de Consejos Profesionales de Ciencias Económicas” (“FACPCE”), based on the National Consumer Price Index (IPC) published by the Instituto Nacional de Estadística y Censos (INDEC) of the Argentine Republic and the Wholesale Internal Price Index (IPIM) published by FACPCE. The cumulative index at December 31, 2020 is 385.8826, while on an annual inflation for 2020 is 36.1%. The main implications are as follows: • Adjustment of the historical cost of non-monetary • The gain on the net monetary position caused by the impact of inflation in the year is included in the consolidated statements of comprehensive income as part of the caption “ Valuation of derivatives, interest cost from labor obligations and other financial items, net” • All items in the financial statements of the Argentine company are translated at the closing exchange rate, which at December 31, 2019 and 2020 were 0.3147 and 0.2371, respectively, per argentine peso per Mexican peso. The difference resulting from the translation process is recognized in equity in the caption “Effect of translation of foreign entities”. At December 31, 2019 and 2020, the cumulative translation adjustment was Ps.(87,367,366) and Ps.(100,926,140), respectively.
Revenue recognition	b) Revenue recognition The Company revenues are derived principally from providing the following telecommunications services and products: wireless voice, wireless data and value-added services, fixed voice, fixed data, broadband and IT services, Pay TV and over-the-top (“OTT”) services. The Company provides fixed and mobile services. These services are offered independently in contracts with customers or together with the sale of handsets (mobile) under the postpaid model. In accordance with IFRS 15 “ Revenues from contracts with customers ” , the transaction price should be assigned to the different performance obligations based on their relative standalone selling price. The Company with respect to the provided services, it has market observable information, to determine the standalone selling price of the services. On the other hand, in the case of the sale of bundled mobile phones sold (including service and handset) by the Company, the allocation of the sales is done based on their relative standalone selling price of each individual component related to the total bundled price. The result is that more equipment revenue is recognized at the moment of a sale and, therefore, less service revenue from the monthly fee are being recognized under IFRS 15. The services provided by the Company are satisfied over the time of the contract period, given that the customer simultaneously receives and consumes the benefits provided by the Company. Such service bundles, voice and data, accomplish the criteria mentioned in IFRS 15 of being substantially similar and of having the same transfer pattern which is why the Company concluded that the revenue from these different services offered to its customers are considered as a single performance obligation with revenue being recognized over time, except for sales of equipment. Under IFRS 15, for tho s The commissions are considered incremental contract acquisition costs that are capitalized and are amortized over the expected period of benefit, during the average duration of customer contracts. Some subsidiaries have loyalty programs where the Company awards credits customer credit awards referred as “points”. The customer can redeem accrued “points” for awards such as devices, accessories or airtime. The Company provides all awards. The consideration allocated to the award credits is identified as a separate performance obligation; the corresponding liability of the award credits is measured at its fair value. The consideration allocated to award credits amount is recognized as a contract liability until the points are redeemed. Revenue is recognized upon redemption of products by the customer.
Cost of sales	c) Cost of sales The cost of mobile equipment and computers is recognized at the time the client and distributor receive the device which is when the control is are transferred to the customer.
Cost of services	d) Cost of services The cost of services represents the costs incurred to properly deliver the services to the customers, it includes the network operating costs and licenses related costs and is accounted at the moment in which such services are provided.
Commissions to distributors	e) Commissions to distributors The Company pays commissions to its distributors different than those that acquire customers. Such commissions are recognized in “commercial, administrative and general expenses”
Cash and cash equivalents	f) Cash and cash equivalents Cash and cash equivalents represent bank deposits and liquid investments with maturities of less than three months. These amounts are stated at cost plus accrued interest, which is similar to their market value. The Company also maintains restricted cash held as collateral to meet certain contractual obligations. Restricted cash is presented as part of “Other assets” within other non-current .
Equity investments at fair value through OCI and other short-term investments	g) Equity investments at fair value through OCI and other short-term investments Equity investments at fair value through OCI and other short-term investments are primarily composed of equity investments and other short-term financial investments. Amounts are initially recorded at their estimated fair value. Fair value adjustments for equity investments are recorded through other comprehensive income, and other short-term investment.
Inventories	h) Inventories Inventories are initially recognized at historical cost and are valued using the average cost method without exceeding their net realizable value. The estimate of the realizable value of inventories on-hand is based on their age and turnover.
Business combinations and goodwill	i) Business combinations and goodwill Business combinations are accounted for using the acquisition method, which in accordance with IFRS 3, “ Business acquisitions (i) Identify the acquirer (ii) Determine the acquisition date (iii) Value the acquired identifiable assets and assumed liabilities (iv) Recognize the goodwill or a bargain purchase gain For acquired subsidiaries, goodwill represents the difference between the purchase price and the fair value of the net assets acquired at the acquisition date. The investment in acquired associates includes goodwill identified on acquisition, net of any impairment loss. Goodwill is reviewed annually to determine its recoverability or more often if circumstances indicate that the carrying value of the goodwill might not be fully recoverable. The possible loss of value in goodwill is determined by analyzing the recovery value of the cash generating unit (or the group thereof) to which the goodwill is associated at the time it was originated. If this recoverable amount is lower than the carrying value, an impairment loss is charged to the results of operations. The recoverable amount is determined based on the higher of fair value less cost of disposal or value in use. For the years ended December 31, 2018, 2019 and 2020, no impairment losses were recognized for goodwill.
Property, plant and equipment	j) Property, plant and equipment i) Property, plant and equipment are recorded at acquisition cost, net of accumulated depreciation; except for the passive infrastructure of telecommunications towers, which are recognized under the revaluation model as of December 31, 2020. Depreciation is computed on the cost of assets using the straight line method, based on the estimated useful lives of the related assets, beginning the month after they become available for use. Borrowing costs that are incurred for general financing for construction in progress for periods exceeding six months are capitalized as part of the cost of the asset. During the years ended December 31, 2018, 2019 and 2020, borrowing costs that were capitalized amounted to Ps.2,020,288, Ps.2,233,358 and Ps.1,771,613, respectively. In addition to the purchase price and costs directly attributable to preparing an asset in terms of its physical location and condition for operating as intended by management, when required, the cost also includes the estimated costs of dismantling and removal of the asset and for restoration of the site where it is located (See Note 16c). The passive infrastructure of telecommunications towers will be recorded at revalued value, which is its fair value at the time of revaluation less accumulated depreciation; if there is any loss or impairment, it must also be considered within its value. The revaluations will be calculated with sufficient regularity to ensure that the book value, every time, does not differ significantly from that which could be determined using the fair value at the end of the reporting period. The increase resulting from a revaluation is recorded in other comprehensive income (OCI) and is accumulated in equity as a revaluation surplus. To the extent that there is a decrease in revaluation, it will be recognized in profit or loss, except to the extent that it compensates for an existing surplus on the same asset. An annual transfer of the asset revaluation surplus and accumulated earnings is made to the extent that the asset is used, therefore, the surplus is equal to the difference between the depreciation calculated on the revalued value and the one calculated according to its original cost. These transfers do not record in the results for the period. A total transfer of the surplus may be made when the entity disposes of the asset. ii) The net book value of property, plant and equipment is removed from the consolidated statements of financial position at the time the asset is sold or when no future economic benefits are expected from its use or sale. Any gains or losses on the sale of property, plant and equipment represent the difference between net proceeds of the sale and the net book value of the item at the time of sale. These gains or losses are recognized as either other operating income or other operating expenses upon sale. iii) The Company periodically assesses the residual values, useful lives and depreciation methods associated with its property, plant and equipment. If necessary, the effects of any changes in accounting estimates is recognized prospectively, at the closing of each period, in accordance with IAS 8, “ Accounting Policies, Changes in Accounting Estimates and Errors For property, plant and equipment made up of several components with different useful lives, the major individual components are depreciated over their individual useful lives. Maintenance costs and repairs are expensed as incurred. Annual depreciation rates are as follows: Network infrastructure 5%-33% Buildings and leasehold improvement 2%-33% Other assets 10%-50% iv) The carrying value of property, plant and equipment is reviewed if there are indicators of impairment in such assets. If an asset’s recovery value is less than the asset’s net carrying value, the difference is recognized as an impairment loss. During the years ended December 31, 2018, 2019 and 2020, no impairment losses were recognized. v) Spare parts for network operation are recognized at cost. The valuation of inventory for network considered obsolete, defective or slow-moving, is reduced to their estimated net realizable value. The estimate of the recovery value of inventories is based on their age and turnover.
Intangibles	k) Intangibles i) Licenses Licenses to operate wireless telecommunications networks granted by the governments of the countries in which the Company operates are recorded at acquisition cost or at fair value at their acquisition date, net of accumulated amortization. Certain licenses require payments to the governments, such payments are recognized in the cost of service and equipment. The licenses that in accordance with government requirements are categorized as automatically renewable, for a nominal cost and with substantially consistent terms, are considered by the Company as intangible assets with an indefinite useful life. Accordingly, they are not amortized. Licenses are amortized when the Company does not have a basis to conclude that they are indefinite lived. Licenses are amortized using the straight-line method over a period ranging from 3 to 30 years, which represents the usage period of the assets. The Company has conducted an internal analysis on the applicability of the International Financial Reporting Interpretation Committee (“IFRIC”) No. 12 (Service Concession Agreements) and has concluded that its concessions are outside the scope of IFRIC 12. To determine the applicability of IFRIC 12, the Company analyzes each concession or group of similar concessions in a given jurisdiction. As a threshold matter, the Company identifies those government concessions that provide for the development, financing, operation or maintenance of infrastructure used to render a public service, and that set out performance standards, mechanisms for adjusting prices and arrangements for arbitrating disputes. With respect to those services, the Company evaluates whether the grantor controls or regulates (i) what services the operator must provide, (ii) to whom it must provide them and (iii) the applicable price (the “Services Criterion”). In evaluating whether the applicable government, as grantor, controls the price at which the Company provides its services, the Company looks at the terms of the concession agreement according to all applicable regulations. If the Company determines that the concession under analysis meets the Services Criterion, then the Company evaluates whether the grantor would hold a significant residual interest in the concession’s infrastructure at the end of the term of the arrangement. ii) Trademarks Trademarks acquired are measured on initial recognition at cost. The cost of trademarks acquired in a business combination is their fair value at the date of acquisition. The useful lives of trademarks are assessed as either definite or indefinite. Trademarks with finite useful lives are amortized using the straight-line method over a period ranging from 1 to 10 years. Trademarks with indefinite useful lives are not amortized but are tested for impairment annually at the cash generating unit level. The assessment of indefinite life is reviewed annually to determine whether the indefinite life continues to be supportable, if not, the change in useful life from indefinite to definite is made on a prospective basis. iii) Irrevocable rights of use Irrevocable rights of use are recognized according to the amount paid for the right and are amortized over the period in which they are granted. The carrying values of the Company’s licenses and trademarks are reviewed annually and whenever there are indicators of impairment in the value of such assets. When an asset’s recoverable amount, which is the higher of the asset’s fair value, less disposal costs and its value in use (the present value of future cash flows), is less than the asset’s carrying value, the difference is recognized as an impairment loss. iv) Customer relationships The value of customer relations is determined and valued at the time that a new subsidiary is acquired, as determined by the Company with the assistance of independent appraisers and is amortized over a 5-year During the years ended December 31, 2018, 2019 and 2020, no significant impairment losses were recognized for licenses, trademarks, irrevocable rights of use or customer relationships.
Impairment in the value of long-lived assets	l) Impairment in the value of long-lived assets The Company assesses the existence of indicators of impairment in the carrying value of long-lived assets, investments in associates, goodwill and intangible assets according to IAS 36 “ Impairment of assets ”. When there are such indicators, or in the case of assets whose nature requires an annual impairment analysis (goodwill and intangible assets with indefinite useful lives), the Company estimates the recoverable amount of the asset, which is the higher of its fair value, less disposal costs, and its value in use. Value in use is determined by discounting estimated future cash flows, applying a pre-tax discount rate that reflects the time value of money and taking into consideration the specific risks associated with the asset. When the recoverable amount of an asset is below its carrying value, impairment is considered to exist. In this case, the carrying value of the asset is reduced to the asset’s recoverable amount, recognizing the loss in results of operations for the respective period. Depreciation and/or amortization expense of future periods is adjusted based on the new carrying value determined for the asset over the asset’s remaining useful life. Impairment is computed individually for each asset. Recoverable amount is determined for an individual asset, unless the asset does not generate cash inflows that are largely independent of those from other assets or group of assets. In the estimation of impairments, the Company uses the strategic plans established for the separate cash-generating units to which the assets are assigned. Such strategic plans generally cover a period from 3 to 5 years. For longer periods, beginning in the fifth year, projections are based on such strategic plans while applying a constant or declining expected perpetual growth rate. Key assumptions used in value in use calculations The forecasts are made in real terms (net of inflation) and in the functional currency of the subsidiary as of December 31, 2020. Financial forecasts, premises and assumptions are similar to what any other market participant in similar conditions would consider, including impacts from the COVID-19 pandemic. Local synergies, that any other market participant would not have taken into consideration to prepare similar forecasted financial information, have not been included. The assumptions used to develop the financial forecasts were validated for each of the cash generating units (“CGUs”), typically identified by country and by service (in the case of Mexico) taking into consideration the following: • Current subscribers and expected growth. • Type of subscribers (prepaid, postpaid, fixed line, multiple services) • Market environment and penetration expectations • New products and services • Economic environment of each country • Expenses for maintaining the current assets • Investments in technology for expanding the current assets • Market consolidation and synergies The foregoing forecasts cou l The recoverable amounts are based on value in use. The value in use is determined based on the method of discounted cash flows. The key assumptions used in projecting cash flows are: • Margin on EBITDA is determined by dividing EBITDA (operating income plus depreciation and amortization) by total revenues. • Margin on CAPEX is determined by dividing capital expendi t • Pre-tax weighted average cost of capital (“WACC”) is used to discount the projected cash flows. As discount rate, the Company uses the WACC which was determined for each of the cash generating units and is described in the following paragraphs. The estimated discount rates to perform the IAS 36 “ Impairment of assets The discount rates represent the current market assessment of the risks specific to each CGU, taking into consideration the time value of money and individual risks of the underlying assets that have not been incorporated in the cash flow estimates. The discount rate calculation is based on the specific circumstances of the Company and its operating segments. The WACC takes into account both debt and equity costs. The cost of equity is derived from the expected return on investment for each GCU. The cost of debt is based on the interest-bearing borrowings the Company is obliged to service. Segment-specific risk is incorporated by applying individual beta factors. The beta factors are evaluated annually based on publicly available market data. Market participant assumptions are important because, not only do they include industry data for growth rates, but also management assesses how the CGU’s position, relative to its competitors, might change over the forecasted period. The most significant forward-looking estimates used for the 2019 and 2020 impairment evaluations are shown below: 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% 6.94% 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% 2020: Europe (7 countries) 32.20% - 40.76% 7.04% - 19.39% 3.88% - 12.02% Brazil (fixed line, wireless and TV) 40.67% 25.36% 9.50% Puerto Rico 23.06% 14.57% 3.53% Dominican Republic 47.57% 13.71% 8.27% Mexico (fixed line and wireless) 32.69% 11.01% 6.03% Ecuador 49.23% 11.14% 17.50% Peru 38.72% 15.43% 4.76% El Salvador 45.92% 21.19% 14.63% Chile 26.34% 13.18% 3.37% Colombia 43.45% 18.19% 6.44% Other countries 10.07% - 47.23% 0.48% - 31.67% 3.42% - 21.85% Sensitivity to changes in assumptions: The implications of the key assumptions for the recoverable amount are discussed below: Margin on CAPEX- The Company performed a sensitivity analysis by increasing its CAPEX by 5% and maintaining all other assumptions the same. The sensitivity analysis would require the Company to adjust the amount of its long-lived assets in its CGUs with potential impairment of approximately Ps.62,548. WACC- Additionally, should the Company increase by 50 base points in WACC per CGU and maintain all other assumptions the same, results without impairment.
Right-of-use assets	m) Right-of-use The Company applies a single recognition and measurement approach for all leases, except for short-term leases and leases of low-value right-of-use i) Right-of-use The Company recognizes right-of-use Right-of-use right-of-use Right-of-use Assets Useful life Towers and sites 5 to 12 years Property 10 to 25 years Other equipment 5 to 15 years The right-of-use ii) Lease liabilities. At the commencement date of the lease, the Company recognizes the lease liabilities measured at the present value of the lease payments to be made over the lease term. Lease payments include fixed payments (including in-substance In calculating the present value of the lease payments, the Company uses an incremental borrowing rate at the lease commencement date, if the interest rate implicit in the lease is not readily determinable. After the commencement date, the amount of lease liabilities is increased to reflect the accretion of interest and reduced for the lease payments made. In addition, the carrying amount of the lease liabilities is remeasured if there is a modification, a change in the lease term, a change in the in-substance iii) Short-term leases and leases of low value assets. The Company applies the short-term lease recognition exemption for its leases of machinery and equipment (i.e., those leases that have a lease term of 12 months or less from the commencement date and do not contain a purchase option). It also applies the recognition exemption lease of low-value low-value .
Financial assets and liabilities	n) Financial assets and liabilities Financial assets Initial recognition and measurement Financial assets are classified, at initial recognition, as subsequently measured at amortized cost, fair value through other comprehensive income (OCI), and fair value through profit or loss. The classification of financial assets at initial recognition depends on the financial asset’s contractual cash flow characteristics and the Company’s business model for managing them, with the exception of trade receivables that do not contain a significant financing component or for which the Company has applied the practical expedient, the Company initially measures a financial asset at its fair value plus, in the case of a financial asset not at fair value through profit or loss, transaction costs. Subsequent measurement For purposes of subsequent measurement, financial assets are classified in four categories: • Financial assets at amortized cost (debt instruments) • Financial assets at fair value through OCI with recycling of cumulative gains and losses (debt instruments) • Financial assets designated at fair value through OCI with no recycling of cumulative gains and losses upon derecognition (equity instruments) • Financial assets at fair value through profit or loss Financial assets at amortized cost (debt instruments) The Company measures financial assets at amortized cost if both of the following conditions are met: • The financial asset is held within a business model with the objective to hold financial assets in order to collect contractual cash flows, and • The contractual terms of the financial asset give rise on specified dates to cash flows that are solely payments of principal and interest on the principal amount outstanding Financial assets at amortized cost are subsequently measured using the effective interest (EIR) method and are subject to impairment. Gains and losses are recognized in profit or loss when the asset is derecognized, modified or impaired. The Company’s financial assets at amortized cost includes cash equivalents, loans and receivables. Financial assets at fair value through OCI with recycling of cumulative gains and losses (debt instruments) The Company measures debt instruments at fair value through OCI if both of the following conditions are met: • The financial asset is held within a business model with the objective of both holding to collect contractual cash flows and selling, and • The contractual terms of the financial asset give rise on specified dates to cash flows that are solely payments of principal and interest on the principal amount outstanding For debt instruments at fair value through OCI, interest income, foreign exchange revaluation and impairment losses or reversals are recognized in the statements of profit or loss and computed in the same manner as for financial assets measured at amortized cost. The remaining fair value changes are recognized in OCI. Upon derecognition, the cumulative fair value change recognized in OCI is recycled to profit or loss. Financial assets designated at fair value through OCI with no recycling of cumulative gains and losses upon derecognition (equity instruments) Upon initial recognition, the Company can elect to classify irrevocably its equity investments as equity instruments designated at fair value through OCI when they meet the definition of equity under IAS 32 Financial Instruments: Presentation and are not held for trading. The classification is determined on an instrument by instrument basis. Gains and losses on these financial assets are never recycled to profit or loss. Dividends are recognized as other income in the statements of profit or loss when the right of payment has been established, except when the Company benefits from such proceeds as a recovery of part of the cost of the financial asset, in which case, such gains are recorded in OCI. Equity instruments designated at fair value through OCI are not subject to impairment assessment. Financial assets at fair value through profit or loss Financial assets at fair value through profit or loss include financial assets held for trading, financial assets designated upon initial recognition at fair value through profit or loss, or financial assets mandatorily required to be measured at fair value. Financial assets are classified as held for trading if they are acquired for the purpose of selling or repurchasing in the near term. Derivatives, including separated embedded derivatives, are also classified as held for trading unless they are designated as effective hedging instruments. Financial assets with cash flows that are not solely payments of principal and interest are classified and measured at fair value through profit or loss, irrespective of the business model. Notwithstanding the criteria for debt instruments to be classified at amortized cost or at fair value through OCI, as described above, debt instruments may be designated at fair value through profit or loss on initial recognition if doing so eliminates, or significantly reduces, an accounting mismatch. Financial assets at fair value through profit or loss are carried in the statements of financial position at fair value with net changes in fair value recognized in the consolidated statements of comprehensive income within “Valuation of derivatives, interest cost from labor obligations and other financial items”. Derecognition of financial assets A financial asset is primarily derecognized when: • The rights to receive cash flows from the asset have expired, or • The Company has transferred its rights to receive cash flows from the asset or has assumed an obligation to pay the received cash flows in full without material delay to a third party under a ‘pass-through’ arrangement; and either (a) the Company has transferred substantially all the risks and rewards of the asset, or (b) the Company has neither transferred nor retained substantially all the risks and rewards of the asset, but has transferred control of the asset When the Company has transferred its rights to receive cash flows from an asset or has entered into a passthrough arrangement, it evaluates if, and to what extent, it has retained the risks and rewards of ownership. When it has neither transferred nor retained substantially all the risks and rewards of the asset, nor transferred control of the asset, the Company continues to recognize the transferred asset to the extent of its continuing involvement. In that case, the Company also recognizes an associated liability. The transferred asset and the associated liability are measured on a basis that reflects the rights and obligations that the Company has retained. Impairment of financial assets The Company recognizes an allowance for expected credit losses (ECLs) for all debt instruments not held at fair value through profit or loss. ECLs are based on the difference between the contractual cash flows due in accordance with the contract and all the cash flows that the Company expects to receive, discounted at an approximation of the original effective interest rate. The expected cash flows will include cash flows from the sale of collateral held or other credit enhancements that are integral to the contractual terms. ECLs are recognized in two stages. For credit exposures for which there has not been a significant increase in credit risk since initial recognition, ECLs are provided for credit losses that result from default events that are possible within the next 12-months (a 12-month ECL). For those credit exposures for which there has been a significant increase in credit risk since initial recognition, a loss allowance is required for credit losses expected over the remaining life of the exposure, irrespective of the timing of the default (a lifetime ECL). For some trade receivables and contract assets based on available information , the Company applies the simplified approach in calculating ECLs. Therefore, the Company does not track changes in credit risk, but instead recognizes a loss allowance based on lifetime ECLs at each reporting date. The Company has established a loss rate approach that is based on its historical credit loss experience, adjusted for forward-looking factors specific to the debtors and the economic environment, including the impact by the COVID-19 pandemic. Financial liabilities Initial recognition Financial liabilities are classified, at initial recognition, as financial liabilities at fair value through profit or loss, loans and borrowings, payables, or as derivatives designated as hedging instruments in an effective hedge, as appropriate. All financial liabilities are recognized initially at fair value and, in the case of loans and borrowings and payables, net of directly attributable transaction costs. The Company’s financial liabilities include trade and other payables, loans and borrowings including bank overdrafts, and derivative financial instruments. Subsequent measurement The measurement of financial liabilities depends on their classification, as described below: Financial liabilities at fair value through profit or loss financial liabilities at fair value through profit or loss include financial liabilities held for trading and financial liabilities designated upon initial recognition as at fair value through profit or loss. Financial liabilities are classified as held for trading if they are incurred for the purpose of repurchasing in the near term. This category also includes derivative financial instruments entered into by the Company that are not designated as hedging instruments in hedge relationships as defined by IFRS 9. Separated embedded derivatives are also classified as held for trading unless they are designated as effective hedging instruments. Gains or losses on liabilities held for trading are recognized in the statements of profit or loss. Financial liabilities designated upon initial recognition at fair value through profit or loss are designated at the initial date of recognition, and only if the criteria in IFRS 9 are satisfied. The Company has not designated any financial liability as at fair value through profit or loss. Loans and borrowings After initial recognition, interest-bearing loans and borrowings are subsequently measured at amortized cost using the EIR method. Gains and losses are recognized in profit or loss when the liabilities are derecognized as well as through the EIR amortization process. Amortized cost is calculated by taking into account any discount or premium on acquisition and fees or costs that are an integral part of the EIR. The EIR amortization is included as finance costs in the statements of profit or loss. Derecognition of financial liabilities A financial liability is derecognized when the obligation under the liability is discharged, cancelled or expires. When an existing financial liability is replaced by another from the same lender on substantially different terms, or the terms of an existing liability are substantially modified, such an exchange or modification is treated as the derecognition of the original liability and the recognition of a new liability. The difference in the respective carrying amounts is recognized in the consolidated statements of comprehensive income. Offsetting of financial instruments Financial assets and financial liabilities are offset and the net amount is reported in the consolidated statements of financial position if there is a currently enforceable legal right to offset the recognized amounts and there is an intention to settle on a net basis, to realize the assets and settle the liabilities simultaneously.
Transactions in foreign currency	o) Transactions in foreign currency Transactions in foreign currency are initially recorded at the prevailing exchange rate at the time of the related transactions. Foreign currency denominated assets and liabilities are subsequently translated at the prevailing exchange rate at the financial statements reporting date. Exchange differences determined from the transaction date to the time foreign currency denominated assets and liabilities are settled or translated at the financial statements reporting date are charged or credited to the results of operations. In determining the spot exchange rate to use on initial recognition of the related asset, expense or income (or part of it) on the derecognition of a non-monetary non-monetary non-monetary non-monetary 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 2018 2019 2020 2019 2020 Argentina (1) Argentine Peso (AR$) 0.7311 0.4110 0.3070 0.3147 0.2371 Brazil Real (R$) 5.2937 4.8907 4.1850 4.6754 3.8387 Colombia Colombian Peso (COP$) 0.0065 0.0059 0.0058 0.0058 0.0058 Guatemala Quetzal 2.5591 2.5023 2.7826 2.4478 2.5596 U.S.A. (2) US Dollar 19.2397 19.2641 21.4860 18.8452 19.9487 Uruguay Uruguay Peso 0.6274 0.5479 0.5110 0.5051 0.4712 Nicaragua Cordoba 0.6097 0.5817 0.6257 0.5569 0.5728 Honduras Lempira 0.7994 0.7806 0.8678 0.7597 0.8215 Chile Chilean Peso 0.0300 0.0275 0.0271 0.0252 0.0281 Paraguay Guaraní 0.0034 0.0031 0.0032 0.0029 0.0029 Peru Sol (PEN$) 5.8517 5.7708 6.1483 5.6814 5.5046 Dominican Republic Dominican Peso 0.3876 0.3737 0.3766 0.3542 0.3416 Costa Rica Colon 0.0332 0.0326 0.0366 0.0327 0.0323 European Union Euro 22.7101 21.5642 24.5080 21.1311 24.3693 Bulgaria Lev 11.6110 11.0257 12.5284 10.8076 12.4594 Belarus New Belarusian Ruble 9.4451 9.2159 8.8172 8.9420 7.5721 Croatia Croatian Kuna 3.0613 2.9069 3.2498 2.8406 3.2279 Macedonia Macedonian Denar 0.3688 0.3504 0.3975 0.3431 0.3950 Serbia Serbian Denar 0.1920 0.1830 0.2083 0.1795 0.2071 (1) Year-end 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 non-monetary net-position (2) Includes U.S.A., Ecuador, El Salvador, Puerto Rico and Panama. As of April 2 6 Ps. 19.8695 appreciation 0.4 year-end
Accounts payable, accrued liabilities and provisions	p) Accounts payable, accrued liabilities and provisions Liabilities are recognized whenever (i) the Company has current obligations (legal or assumed) resulting from a past event, (ii) when it is probable the obligation will give rise to a future cash disbursement for its settlement, and (iii) the amount of the obligation can be reasonably estimated. When the effect of the time value of money is significant, the amount of the liability is determined as the present value of the expected disbursements to settle the obligation. The discount rate is determined on a pre-tax Contingent liabilities are recognized only when it is probable, they will give rise to a future cash disbursement for their settlement.
Employee benefits	q) Employee benefits The Company has defined benefit pension plans for its subsidiaries Puerto Rico Telephone Company, Teléfonos de Mexico, Claro Brasil, and Telekom Austria. Claro Brasil also has medical plans and defined contribution plans and Telekom Austria provides retirement benefits to its employees under a defined contribution plan. The Company recognizes the costs of these plans based upon independent actuarial computations and are determined using the projected unit credit method. The latest actuarial computations were prepared as of December 31, 2020. Mexico Mexican subsidiaries have the obligation to pay seniority premiums to personnel based on the Mexican Federal Labor Law which also establishes the obligation to make certain payments to personnel who cease to provide services under certain circumstances. Pensions (for Telmex) and seniority premiums are determined based on the salary of employees in their final year of service, the number of years worked at and their age at the moment of retirement. The costs of pensions, seniority premiums and severance benefits, are recognized based on calculations by independent actuaries using the projected unit credit method using financial hypotheses, net of inflation. Telmex has established an irrevocable trust fund and makes annual contributions to that fund. Puerto Rico In Puerto Rico, the Company has noncontributing pension plans for full-time employees, which are tax qualified as they meet Employee Retirement Income Security Act of 1974 requirements. The pension benefit is composed of two elements: (i) An employee receives an annuity at retirement if they meet the rule of 85 (age at retirement plus accumulated years of service). The annuity is calculated by applying a percentage times year of services to the last three years of salary. (ii) The second element is a lump-sum Brazil Claro Brasil provides a defined benefit plan and post-retirement medical assistance plan, and a defined contribution plan, through a pension fund that supplements the government retirement benefit for certain employees. Under the defined benefit plan, the Company makes monthly contributions to the pension fund equal to 17.5% of the employee’s aggregate salary. In addition, the Company contributes a percentage of the aggregate salary base for funding the post-retirement medical assistance plan for the employees who remain in the defined benefit plan. Each employee makes contributions to the pension fund based on age and salary. All newly hired employees automatically adhere to the defined contribution plan and no further admittance to the defined benefit plan is allowed. For the defined contribution plan, see Note 18. Austria Telekom Austria provides retirement benefits to its employees under defined contribution and defined benefit plans. The Company pays contributions to publicly or privately administered pension or severance insurance plans on mandatory or contractual basis. Once the contributions have been paid, the Company has no further payment obligations. The regular contributions are recognized as employee expenses in the year in which they are due. All other employee benefit obligations provided in Austria are unfunded defined benefit plans for which the Company records provisions which are calculated using the projected unit credit method. The future benefit obligations are measured using actuarial methods on the basis of an appropriate assessment of the discount rate, rate of employee turnover, rate of compensation increase and rate of increase in pensions. For severance and pensions, the subsidiary recognizes actuarial gains and losses in other comprehensive income. The re-measurement Other subsidiaries For the rest of the Company’s subsidiaries, there are no defined benefit plans or compulsory defined contribution structures. However, certain subsidiaries make contributions to national pension, social security and severance plans in accordance with the percentages and rates established by the applicable social security and labor laws of each country. Such contributions are made to the entities designated by the countries legislation and are recorded as direct labor expenses in the consolidated statements of comprehensive income as they are incurred. Remeasurements of defined benefit plans, comprising of actuarial gains and losses, the effect of the asset ceiling, excluding net interest and the return on plan assets (excluding net interest), are recognized immediately in the consolidated statements of financial position with a corresponding debit or credit to retained earnings through OCI in the period in which they occur. Re-measurements Past service costs are recognized in profit or loss on the earlier of: (i) The date of the plan amendment or curtailment, and (ii) The date that the Company recognizes restructuring-related costs Net interest on liability for defined benefits is calculated by applying the discount rate to the net defined benefit liability or asset and it is recognized in the “valuation of derivatives, interest cost from labor obligations and other financial items” in the consolidated statements of comprehensive income. The Company recognizes the changes in the net defined benefit obligation under “Cost of sales and services” and “Commercial, administrative and general expenses” in the consolidated statements of comprehensive income. Paid absences The Company recognizes a provision for the cost of paid absences, such as vacation time, based on the accrual method.
Employee profit sharing	r) Employee profit sharing Employee profit sharing is paid by certain subsidiaries of the Company to its eligible employees. The Company has employee profit sharing in Mexico, Ecuador and Peru. In Mexico, employee profit sharing is computed at the rate of 10% on the individual subsidiaries taxable base adjusted for employee profit sharing purposes as provided by law. Employee profit sharing is presented as an operating expense in the consolidated statements of comprehensive income.
Taxes	s) Taxes Income taxes Current income tax payable is presented as a short-term liability, net of prepayments made during the year. Deferred income tax is determined using the liability method based on the temporary differences between the tax values of the assets and liabilities and their book values at the consolidated financial statements reporting date. Deferred tax assets and liabilities are measured using the tax rates that are expected to be in effect in the period when the asset will materialize or the liability will be settled, based on the enacted tax rates (and tax legislation) that have been enacted or substantially enacted at the financial statements reporting date. The value of deferred tax assets is reviewed by the Company at each financial statements reporting date and is reduced to the extent that it is more likely that the Company will not have sufficient future tax profits to allow for the realization of all or a part of its deferred tax assets. Unrecognized deferred tax assets are revalued at each financial statement reporting date and are recognized when it is more likely that there will be sufficient future tax profits to allow for the realization of these assets. Deferred taxes relating to items recognized in Other Comprehensive Income are recognized together with the concept that generated such deferred taxes. Deferred taxes consequence on unremitted earnings from subsidiaries and associates are considered as temporary differences, when the timing of the reversal of the temporary differences can be controlled and it is probable that the temporary differences will not reverse in the foreseeable future. Taxes withheld on remitted foreign earnings are creditable against Mexican taxes, thus to the extent that a remittance is to be made, the deferred tax would be limited to the incremental difference between the Mexican tax rate and the rate of the remitting country. As of December 31, 2019 and 2020, the Company has not provided for any deferred taxes related to unremitted foreign earnings. The Company offsets tax assets and liabilities if it has a legally enforceable right to set off current tax assets and current tax liabilities and the deferred tax assets and deferred tax liabilities relate to income taxes levied by the same tax authority. Sales tax Revenues, expenses and assets are recognized net of the amount of sales tax, except: • When the sales tax incurred on a purchase of assets or services is not recoverable from the taxation authority, in which case, the sales tax is recognized as part of the cost of acquisition of the asset or as part of the expense item, as applicable. • Receivables and payables that are stated with the amount of sales tax included. The net amount of sales tax recoverable from, or payable to, the tax authorities is included as part of the current receivables or payables in the consolidated statements of financial position unless they are due in more than a year in which case they are classified as non-current.
Advertising	t) Advertising Advertising expenses are recognized as incurred. For the years ended December 31, 2018, 2019 and 2020, advertising expenses were Ps.26,255,952, Ps.22,810,211 and Ps.19,894,607 respectively, and are presented in the consolidated statements of comprehensive income in the caption “Commercial, administrative and general expenses”.
Earnings per share	u) Earnings per share Basic and diluted earnings per share are determined by dividing net profit of the year by the weighted-average number of shares outstanding during the year. In determining the weighted average number of outstanding shares, shares repurchased by the Company have been excluded.
Financial risks	v) Financial risks The main risks associated with the Company’s financial instruments are: (i) liquidity risk, (ii) market risk (foreign currency exchange risk and interest rate risk) and (iii) credit risk and counterparty risk. The Board of Directors approves the policies submitted by management to mitigate these risks. i) Liquidity risk Liquidity risk is the risk that the Company may not meet its financial obligations associated with financial instruments when they are due. The Company’s financial obligations and commitments are included in Notes 14 and 17. ii) Market risk The Company is exposed to certain market risks derived from changes in interest rates and fluctuations in exchange rates of foreign currencies. The Company’s debt is denominated in foreign currencies, mainly in US dollars and euros, other than its functional currency. In order to reduce the risks related to fluctuations in the exchange rate of foreign currency, the Company uses derivative financial instruments such as cross-currency swaps and forwards to adjust exposures resulting from foreign exchange currency. The Company does not use derivatives to hedge the exchange risk arising from having operations in different countries. Additionally, the Company occasionally uses interest rate swaps to adjust its exposure to the variability of the interest rates or to reduce their financing costs. The Company’s practices vary from time to time depending on judgments about the level of risk, expectations of change in the movements of interest rates and the costs of using derivatives. The Company may terminate or modify a derivative financial instrument at any time. See Note 7 for disclosure of the fair value of derivatives as of December 31, 2019 and 2020. iii) Credit risk Credit risk represents the loss that could be recognized in case the counterparties fail to comply with their contractual obligations. The financial instruments that potentially represent concentrations of credit risk are cash and short-term deposits, trade accounts receivable and financial instruments related to debt and derivatives. The Company’s policy is designed in order to limit its exposure to any one financial institution; therefore, the Company’s financial instruments are contracted with several different financial institutions located in different geographic regions. The credit risk in accounts receivable is diversified because the Company has a broad customer base that is geographically dispersed. The Company continuously evaluates the credit conditions of its customers and generally does not require collateral to guarantee collection of its accounts receivable. The Company monitors on a monthly basis its collection cycle to avoid deterioration of its results of operations. A portion of the Company’s cash surplus is invested in short- term deposits with financial institutions with high credit ratings. iv) Sensitivity analysis for market risks The Company uses sensitivity analysis to measure the potential losses based on a theoretical increase of 100 basis points in interest rates and a 5% fluctuation in exchange rates: Interest rate In the event that the Company’s agreed-upon interest rates at December 31, 2020 increase/(decrease) by 100 basis points and a 5% fluctuation in exchange rates, the net interest expense would increase/(decrease) by Ps.1,476,660 and Ps.(13,417,231), respectively. Exchange rate fluctuations Should the Company’s debt at December 31, 2020 of Ps.628,382,956, suffer a 5% increase/(decrease) in exchange rates, the debt would increase/(decrease) by Ps.31,429,089 and Ps.(31,429,089), respectively.
Derivative financial instruments	w) Derivative financial instruments Derivative financial instruments are recognized in the consolidated statements of financial position at fair value. Valuations obtained by the Company are compared against those of the financial institutions with which the agreements are entered into, and it is the Company’s policy to compare such fair value to a valuation provided by an independent pricing provider in case of discrepancies. Changes in the fair value of derivatives that do not qualify as hedging instruments are recognized immediately in the line “Valuation of derivatives, interest cost from labor obligations and other financial items, net”. The Company is exposed to interest rate and foreign currency risks, which tries to mitigate through a controlled risk management program that includes the use of derivative financial instruments. The Company principally uses to offset the risk of exchange rate and interest rate fluctuations. Additionally, for the years ended December 31, 2018, 2019 and 2020 certain of the Company’s derivative financial instruments had been designated, and had qualified, as cash flow hedges. The effective portion of gains or losses on the cash flow derivatives is recognized in equity under the heading “Effect for fair value of derivatives”, and the ineffective portion is charged to results of operations of the period.
Current versus non-current classification	x) Current versus non-current The Company presents assets and liabilities in its consolidated statements of financial position based on current/non-current An asset is current when it is either: (i) Expected to be realized or intended to be sold or consumed in the normal operating cycle. (ii) Held primarily for the purpose of trading. (iii) Expected to be realized within twelve months after the reporting period. (iv) Cash and cash equivalents unless restricted from being exchanged or used to settle a liability for at least twelve months after the reporting period. A liability is current when: • It is expected to be settled in the normal operating cycle. • It is held primarily for the purpose of trading. • It is due to be settled within twelve months after the reporting period. • There is no unconditional right to defer the settlement of the liability for at least twelve months after the reporting period. The Company classifies all other assets and liabilities, including deferred income tax assets and liabilities, as non-current.
Presentation of consolidated statements of comprehensive income	y) Presentation of consolidated statements of comprehensive income The costs and expenses shown in the consolidated statements of comprehensive income are presented in combined manner (based on both their function and nature), which allows a better understanding of the components of the Company’s operating income. This classification allows a comparison to the telecommunications industry. The Company presents operating income in its consolidated statements of comprehensive income since it is a key indicator of the Company’s performance. Operating income represents operating revenues less operating costs and expenses.
Operating segments	z) Operating segments Segment information is presented based on information used by management in its decision-making processes. Segment information is presented based on the geographic areas in which the Company operates. The management of the Company is responsible for making decisions regarding the resources to be allocated to the Company’s different segments, as well as evaluating the performance of each segment. Intersegment revenues and costs, intercompany balances as well as investments in shares in consolidated entities are eliminated upon consolidation and reflected in the “eliminations” column in Note 23. None of the segments records revenue from transactions with a single external customer amounting to 10% or more of the revenues.
Convenience translation	Aa) Convenience translation The consolidated financial statements are stated in thousands of Mexican pesos (“Ps.”); however, solely for the convenience of the readers, the consolidated statement of financial position as of December 31, 2020 and the consolidated statement of comprehensive income and consolidated statement of cash flows for the year ended December 31, 2020 were converted into U.S. dollars at the exchange rate of Ps.19.9487 per U.S. dollar, which was the exchange rate at that date. This arithmetic conversion should not be construed as representations that the amounts expressed in Mexican pesos may be converted into U.S. dollars at that or any other exchange rate .
Significant accounting judgments, estimates and assumptions	Ab) Significant accounting judgments, estimates and assumptions In preparing its consolidated financial statements, the Company makes estimates concerning a variety of matters. Some of these matters are highly uncertain, and its estimates involve judgments it makes based on the available information. In the discussion below, the Company has identified several of these matters for which its financial statements would be materially affected if either (1) the Company uses different estimates that it could have reasonably used or (2) in the future América Móvil changes its estimates in response to changes that are reasonably likely to occur. The following discussion addresses only those estimates that the Company considers most important based on the degree of uncertainty and the likelihood of a material impact had it used a different estimate. There are many other areas in which the Company uses estimates about uncertain matters, but the reasonably likely effect of changed or different estimates is not material to the financial presentation for those other areas. Estimated useful lives of plant, property and equipment The Company currently depreciates most of its network infrastructure based on an estimated useful life determined upon the expected particular conditions of operation and maintenance in each of the countries in which it operates. The estimates are based on AMX’s historical experience with similar assets, anticipated technological changes and other factors, taking into account the practices of other telecommunications companies. The Company reviews estimated useful lives each year to determine, for each particular class of assets, whether they should be changed. The Company may shorten/extend the estimated useful life of an asset class in response to technological changes, changes in the market or other developments. This results in increased/decreased depreciation expense (See Note 10). Revaluation of passive infrastructure of telecommunications towers The Company recognizes the passive structure of the telecommunication towers at fair value, recognizing the changes in OCI. The discounted cash flow model was used. The Company hired a valuation specialist with industry experience to measure fair values as of December 31, 2020. Impairment of Long-Lived Assets The Company has large amounts of long-lived assets, including property, plant and equipment, intangible assets, investments in affiliates and goodwill on its consolidated statements of financial position. The Company is required to test long-lived assets for impairment when circumstances indicate a potential impairment or, in some cases, at least on an annual basis. The impairment analysis for long-lived assets requires the Company to estimate the recoverable amount of the asset, which is the higher of its fair value (minus any disposal costs) and its value in use. To estimate the fair value of a long-lived asset, the Company typically takes into account recent market transactions or, if no such transactions can be identified, the Company uses a valuation model that requires making certain assumptions and estimates. Similarly, to estimate the value in use of long-lived assets, the Company typically makes various assumptions about the future prospects for the business to which the asset relates, considers market factors specific to that business and estimates future cash flows to be generated by that business. Based on this impairment analysis, including all assumptions and estimates related thereto, as well as guidance provided by IFRS relating to the impairment of long-lived assets different assumptions and estimates could materially impact the Company’s reported financial results. More conservative assumptions of the anticipated future benefits from these businesses could result in impairment charges, which would decrease net income and result in lower asset values on the consolidated statements of financial position. Conversely, less conservative assumptions could result in smaller or no impairment charges, higher net income and higher asset values. The key assumptions used to determine the recoverable amount for the Company’s CGUs, are further explained in Notes 23, 10 and 11. Deferred Income Taxes The Company is required to estimate its income taxes in each of the jurisdictions in which it operates. This process involves the jurisdiction-by-jurisdiction estimation of actual current tax exposure and the assessment of temporary differences resulting from the differing treatment of certain items, such as accruals and amortization, for tax and financial reporting purposes, as well as net operating loss carry-forwards and other tax credits. These items result in deferred tax assets and liabilities as discussed in Note 2 s). The analysis is based on estimates of taxable income in the jurisdictions in which the Company operates and the period on which the deferred tax assets and liabilities will be recovered or settled. If actual results differ from these estimates, or the Company adjusts these estimates in future periods, its financial position and results of operations may be materially affected. In assessing the future realization of deferred tax assets, the Company considers future taxable income, ongoing planning strategies and future results in its operations. In the event that the estimates of projected future taxable income are lowered, or changes in current tax regulations are enacted that would impose restrictions on the timing or extent of the ability to utilize the tax benefits of net operating loss carry-forwards in the future, an adjustment to the recorded amount of deferred tax assets would be made, with a related charge to income. See Note 13. Accruals Accruals are recorded when, at the end of the period, the Company has a present obligation as a result of past events, whose settlement requires an outflow of resources that is considered probable and can be measured reliably. This obligation may be legal or constructive, arising from, but not limited to, regulation, contracts, common practice or public commitments, which have created a valid expectation for third parties that the Company will assume certain responsibilities. The amount recorded is the best estimation performed by the Company’s management in respect of the disbursement that will be required to settle the obligations, considering all the information available at the date of the financial statements, including the opinion of external experts, such as legal advisors or consultants. Accruals are adjusted to account for changes in circumstances for ongoing matters and the establishment of additional accruals for new matters. If the Company is unable to reliably measure the obligation, no accrual is recorded, and information is then presented in the notes to its consolidated financial statements. Because of the inherent uncertainties in these estimations, actual expenditures may be different from the originally estimated amount recognized. See Note 16. The Company is subject to various claims and contingencies related to tax, labor and legal proceedings as described in Note 17b). Labor Obligations The Company recognizes liabilities on its consolidated statements of financial position and expenses in its statements of comprehensive income to reflect its obligations related to its post-retirement seniority premiums, pension and retirement plans in the countries in which it operates and offer defined contribution and benefit pension plans. The amounts the Company recognizes are determined on an actuarial basis that involves estimations and accounts for post-retirement and termination benefits. The Company uses estimates in four specific areas that have a significant effect on these amounts: (i) the rate of return the Company assumes its pension plans will earn on its investments, (ii) the salaries increase rate that the Company assumes it will observe in future years, (iii) the discount rates that the Company uses to calculate the present value of its future obligations and (iv) the expected inflation rate. The assumptions applied are further disclosed in Note 18. These estimates are determined based on actuarial studies performed by independent experts using the projected unit-credit method.

Basis of Preparation of the C_3

Basis of Preparation of the Consolidated Financial Statements and Summary of Significant Accounting Policies and Practices (Tables)	12 Months Ended
	Dec. 31, 2020
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Summary of Equity Interest in Most Significant Subsidiaries	The equity interest in the most significant subsidiaries at December 31, 2019 and 2020 is as follows: Company name Country Equity interest at December 31 2019 2020 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 % 100.0 % Nextel Telecomunicações Ltda b) Brazil 100.0 % 100.0 % Telecomunicaciones de Guatemala, S.A. (“Telgua”) b) Guatemala 99.3 % 99.3 % Claro Guatemala, S.A. b) Guatemala 100.0 % 100.0 % Empresa Nicaragüense de Telecomunicaciones, S.A. (“Enitel”) b) Nicaragua 99.6 % 99.6 % Compañía de Telecomunicaciones de El Salvador, S.A. de C.V. b) El Salvador 95.8 % 95.8 % Comunicación Celular, S.A. (“Comcel”) b) Colombia 99.4 % 99.4 % 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 2019 and 2020 impairment evaluations are shown below: 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% 6.94% 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% 2020: Europe (7 countries) 32.20% - 40.76% 7.04% - 19.39% 3.88% - 12.02% Brazil (fixed line, wireless and TV) 40.67% 25.36% 9.50% Puerto Rico 23.06% 14.57% 3.53% Dominican Republic 47.57% 13.71% 8.27% Mexico (fixed line and wireless) 32.69% 11.01% 6.03% Ecuador 49.23% 11.14% 17.50% Peru 38.72% 15.43% 4.76% El Salvador 45.92% 21.19% 14.63% Chile 26.34% 13.18% 3.37% Colombia 43.45% 18.19% 6.44% Other countries 10.07% - 47.23% 0.48% - 31.67% 3.42% - 21.85%
Summary of quantitative information about right-of-use assets	Right-of-use 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 2018 2019 2020 2019 2020 Argentina (1) Argentine Peso (AR$) 0.7311 0.4110 0.3070 0.3147 0.2371 Brazil Real (R$) 5.2937 4.8907 4.1850 4.6754 3.8387 Colombia Colombian Peso (COP$) 0.0065 0.0059 0.0058 0.0058 0.0058 Guatemala Quetzal 2.5591 2.5023 2.7826 2.4478 2.5596 U.S.A. (2) US Dollar 19.2397 19.2641 21.4860 18.8452 19.9487 Uruguay Uruguay Peso 0.6274 0.5479 0.5110 0.5051 0.4712 Nicaragua Cordoba 0.6097 0.5817 0.6257 0.5569 0.5728 Honduras Lempira 0.7994 0.7806 0.8678 0.7597 0.8215 Chile Chilean Peso 0.0300 0.0275 0.0271 0.0252 0.0281 Paraguay Guaraní 0.0034 0.0031 0.0032 0.0029 0.0029 Peru Sol (PEN$) 5.8517 5.7708 6.1483 5.6814 5.5046 Dominican Republic Dominican Peso 0.3876 0.3737 0.3766 0.3542 0.3416 Costa Rica Colon 0.0332 0.0326 0.0366 0.0327 0.0323 European Union Euro 22.7101 21.5642 24.5080 21.1311 24.3693 Bulgaria Lev 11.6110 11.0257 12.5284 10.8076 12.4594 Belarus New Belarusian Ruble 9.4451 9.2159 8.8172 8.9420 7.5721 Croatia Croatian Kuna 3.0613 2.9069 3.2498 2.8406 3.2279 Macedonia Macedonian Denar 0.3688 0.3504 0.3975 0.3431 0.3950 Serbia Serbian Denar 0.1920 0.1830 0.2083 0.1795 0.2071 (1) Year-end 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 non-monetary net-position (2) Includes U.S.A., Ecuador, El Salvador, Puerto Rico and Panama.

Accounts receivable from subs_2

Accounts receivable from subscribers, distributors, recoverable taxes contractual assets and other, net (Tables)	12 Months Ended
	Dec. 31, 2020
Statement [line items]
Summary of Analysis of Accounts Receivable by Component	a) At December 31, 2019 2020 Subscribers and distributors Ps.184,260,099 Ps. 168,758,386 Telecommunications carriers for network interconnection and other services 5,079,763 4,914,094 Recoverable taxes 23,628,728 44,557,402 Sundry debtors 12,084,050 12,504,566 Contract assets 34,274,007 29,588,104 Impairment of trade receivables (39,480,909 ) (44,551,735 ) Total net Ps.219,845,738 Ps. 215,770,817 Non-current Ps. 15,139,442 Ps. 7,792,863 Total current subscribers, distributors and contractual assets Ps.204,706,296 Ps. 207,977,954
Schedule of Changes in Allowance for Expected Credit Losses	b) Changes in the impairment of trade receivables is as follows: For the years ended December 31, 2018 2019 2020 Balance at beginning of year Ps.(39,044,925 ) Ps.(40,798,025 ) Ps.(39,480,909 ) Increases recorded in expenses (19,535,707 ) (16,346,395 ) (19,112,635 ) Adjustment on initial application of IFRS 9 (2,400,783 ) — — Write-offs 15,497,254 17,839,957 11,953,227 Business combination (3,265,490 ) (2,066 ) Translation effect 4,686,136 3,089,044 2,090,648 Balance at end of year Ps.(40,798,025 ) Ps.(39,480,909 ) Ps.(44,551,735 )
Summary of Aging of Accounts Receivable	c) The following table shows the aging of accounts receivable at December 31, 2019 and 2020, for subscribers and distributors: Past due Total Unbilled services provided a-30 days 31-60 days 61-90 days Greater than 90 days December 31, 2019 Ps. 184,260,099 Ps. 76,223,243 Ps. 46,083,644 Ps. 6,076,281 Ps. 4,121,929 Ps. 51,755,002 December 31, 2020 Ps. 168,758,386 Ps. 75,972,811 Ps. 37,439,995 Ps. 5,325,264 Ps. 3,313,835 Ps. 46,706,481
Summary of Accounts Receivable from Subscribers and Distributors Included in the Allowance for Doubtful Accounts	d) The following table shows the accounts receivable from subscribers and distributors included in the impairments of trade receivables, as of December 31, 2019 and 202 0 : Total 1-90 days Greater than 90 days December 31, 2019 Ps. 39,480,909 Ps. 3,948,091 Ps. 35,532,818 December 31, 2020 Ps. 44,551,735 Ps. 4,455,174 Ps. 40,096,561
Summary of Analysis of Contract Assets and Liabilities	e) An analysis of contract assets and liabilities at December 31, 2019 and 2020 is as follows: 2019 2020 Contract Assets: Balance at the beginning of the year Ps. 34,718,749 Ps. 34,274,007 Additions 34,877,851 27,242,031 Disposals (2,658,641 ) (1,397,714 ) Business Combination 576,463 — Amortization (30,501,315 ) (29,002,995 ) Translation effect (2,739,100 ) (1,527,225 ) Balance at the end of the year Ps. 34,274,007 Ps. 29,588,104 Non-current Ps. 1,786,560 Ps. 817,740 Current portion contracts assets Ps. 32,487,447 Ps. 28,770,364

Related Parties (Tables)

Related Parties (Tables)	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Summary of Analysis of the Balances with Related Parties	a) The following is an analysis of the balances with related parties as of December 31, 2019 and 2020. All of the companies were considered affiliates of América Móvil since the Company’s principal shareholders are either direct or indirect shareholders in the related parties. 2019 2020 Accounts receivable: Hubard y Bourlon, S.A. de C.V. Ps. 172,952 Ps. 437,231 Patrimonial Inbursa, S.A. 386,194 327,985 Sears Roebuck de México, S.A. de C.V. and Subsidiaries. 228,523 233,402 Sanborns Hermanos, S.A. 229,964 160,116 Claroshop.com, S.A.P.I de C.V. 91,874 100,075 Grupo Condumex, S.A. de C.V. and Subsidiaries 12,018 10,038 Carso Infraestructura y Construcción, S.A. de C.V. and Subsidiaries 41,204 7,679 Other 110,411 114,774 Total Ps.1,273,140 Ps.1,391,300 2019 2020 Accounts payable: Carso Infraestructura y Construcción, S.A. de C.V. and Subsidiaries Ps.1,656,123 Ps.2,192,405 Grupo Condumex, S.A. de C.V. and Subsidiaries 905,776 1,054,526 Fianzas Guardiana Inbursa, S.A. de C.V. 241,305 241,898 Grupo Financiero Inbursa, S.A.B. de C.V. 246,804 234,954 Seguros Inbursa, S.A. de C.V. 100,155 92,173 PC Industrial, S.A. de C.V. and Subsidiaries 68,189 44,198 Enesa, S.A. de C.V. and Subsidiaries 25,076 22,014 Other 216,991 117,748 Total Ps.3,460,419 Ps.3,999,916
Summary of Transactions with Related Parties	b) For the years ended December 31, 2018, 2019 and 2020, the Company conducted the following transactions with relate d parties: 2018 2019 2020 Investments and expenses: Construction services, purchases of materials, inventories and property, plant and equipment (i) Ps. 7,211,960 Ps. 8,573,894 Ps. 7,130,769 Insurance premiums, fees paid for administrative and operating services, brokerage services and others (ii) 4,134,380 4,590,620 4,375,113 Rent of towers (iii) 6,168,592 — — Other services 1,864,017 1,277,404 1,101,528 Ps. 19,378,949 Ps. 14,441,918 Ps. 12,607,410 Revenues: Service revenues Ps. 679,220 Ps. 538,110 Ps. 608,248 Sales of equipment 1,296,204 944,697 656,801 Ps. 1,975,424 Ps. 1,482,807 Ps. 1,265,049 i) In 2020, this amount includes Ps.5,312,845 (Ps.6,809,244 in 2019 and Ps.5,622,791 in 2018) for network construction services and construction materials purchased from subsidiaries of Grupo Carso, S.A.B. de C.V. (Grupo Carso). ii) In 2020, this amount includes Ps.203,013 (Ps.956,132 in 2019 and Ps.778,191 in 2018) for network maintenance services performed by Grupo Carso subsidiaries; Ps.13,490 in 2020 (Ps.16,161 in 2019, and Ps.13,784 in 2018) for software services provided by an associate; Ps.2,713,370 in 2020 (Ps.2,623,795 in 2019 and Ps.2,541,703 in 2018) for insurance premiums with Seguros Inbursa S.A. and Fianzas Guardiana Inbursa, S.A., which, in turn, places most of such insurance with reinsurers. iii) Due to the implementation of IFRS 16 amounts related to payments for tower leases are no longer considered rental expenses.

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Schedule of Derivative Financial Instruments Contracted	An analysis of the derivative financial instruments contracted by the Company at December 31, 2019 and 2020 is as follows: At December 31, 2019 2020 Instrument Notional amount in Fair Value Notional amount in millions Fair Value Assets: Swaps US Dollar-Mexican peso US$ 3,290 Ps. 4,420,433 US$ 3,490 Ps.16,806,937 Swaps US Dollar – Euro US$ 150 96,967 US$ 150 117,726 Swaps Yen-US ¥ 6,500 262,993 ¥ 9,750 269,215 Swaps Pound sterling – US Dollar £ 100 2,988 £ 1,010 2,237,919 Forwards US Dollar – Mexican Peso US$ 100 18 US$ 240 39,607 Forwards US Dollar-Brazilian US$ 83 90,429 — — Forwards Brazilian Real-US Dollar BRL 5,803 1,620,605 BRL$ 4,193 1,190,292 Forwards Euro-Brazilian € 50 4,255 — — Forwards Euro-US € 1,506 204,241 € 915 266,639 Forwards Argentinean Peso – US Dollar ARS$ 1,388 122,831 — — Total Assets Ps.6,825,760 Ps.20,928,335 At December 31, 2019 2020 Instrument Notional amount in Fair Value Notional amount in millions Fair Value Liabilities: Swaps US Dollar-Mexican peso US$ 200 Ps. (33,253 ) — Ps. — Swaps US Dollar-Euro US$ 800 (2,228,287 ) US$ 800 (4,811,031 ) Swaps Yen-US — — ¥ 3,250 (14,802 ) Swaps Pound sterling-Euro £ 640 (2,201,997 ) £ 640 (3,122,492 ) Swap Pound sterling-US £ 2,010 (3,019,255 ) £ 550 (457,559 ) Forwards US Dollar-Mexican Peso US$ 2,343 (1,398,247 ) US$ 3,494 (4,052,852 ) Forwards Brazilian Real-US — — BRL$ 1,762 (425,249 ) Forwards Euro – Mexican Peso — — € 200 (272,274 ) Forwards Euro-US Dollar € 1,094 (554,278 ) — — Forwards US Dollar – Euro US$ 20 (3,787 ) — — Forwards Euro – Brazilian Real € 140 (10,196 ) — — Forwards Yen – US Dollar ¥ 6,500 (18,769 ) — — Put option € 374 (126,569 ) € 374 (1,073,990 ) Call option € 3,000 (2,113 ) — — Total Liabilities Ps.(9,596,751 ) Ps.(14,230,249 )
Summary of Maturities of Notional Amount of Derivatives	The maturities of the notional amount of the derivatives are as follow s : Instrument Notional amount in millions 2021 2022 2023 2024 2025 Thereafter Assets Swaps US Dollar-Mexican peso US$ 1,600 1,890 Swaps Yen-US Dollar ¥ 9,750 Swaps US Dollar – Euro US$ 150 Swaps Pound sterling – US Dollar £ 1,010 Forwards US Dollar-Mexican Peso US$ 240 Forwards Brazilian Real-US Dollar BRL 4,193 Forwards Euro-US Dollar € 915 Liabilities Swaps US Dollar-Euro US$ 800 Swaps Yen-US Dollar ¥ 3,250 Swaps Pound sterling-Euro £ 640 Swap Pound sterling-US Dollar £ 550 Forwards US Dollar – Mexican Peso US$ 3,494 Forwards Brazilian Real-US Dollar BRL 1,762 Forwards Euro – Mexican Peso € 200 Put option € 374

Inventories, net (Tables)

Inventories, net (Tables)	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Summary of Analysis of Inventories	An analysis of inventories at December 31, 2019 and 2020 is as follows: 2019 2020 Mobile phones, accessories, computers, TVs, cards and other materials Ps.43,954,616 Ps.33,763,086 Less: Reserve for obsolete and slow-moving inventories (2,852,604 ) (3,385,647 ) Total Ps.41,102,012 Ps.30,377,439

Other assets, net (Tables)

Other assets, net (Tables)	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Summary of Analysis of Other Assets	An analysis of other assets at December 31, 2019 and 2020 is as follows: 2019 2020 Current portion: Advances to suppliers (different from PP&E and inventories) Ps. 7,718,343 Ps. 7,600,644 Prepaid insurance 978,927 1,300,019 Other 776,164 93,244 Ps. 9,473,434 Ps. 8,993,907 Non-current Recoverable taxes Ps.14,647,726 Ps.11,559,961 Prepayments for the use of fiber optics 2,095,556 2,709,358 Judicial Deposits (1) 19,506,147 15,402,840 Prepaid expenses 5,642,590 8,743,667 Total Ps.41,892,019 Ps.38,415,826

Property, Plant and Equipment_2

Property, Plant and Equipment, Net (Tables)	12 Months Ended
	Dec. 31, 2020
Statement [line items]
Schedule of Property, Plant and Equipment, Net	a) At December 31, 2017 Additions Retirements Business combinations Effect of translation of foreign subsidiaries and hyperinflation adjustment Depreciation for the year At December 31, 2018 Cost Network in operation and equipment Ps. 989,665,946 Ps. 68,900,443 Ps. (1,610,246 ) Ps.128,246 Ps. (87,888,453 ) Ps. — Ps. 969,195,936 Land and buildings 62,584,189 4,429,433 (3,987,671 ) 8,874 (5,904,499 ) — 57,130,326 Other assets 150,315,807 25,268,252 (13,377,798 ) 2,578 (12,399,702 ) — 149,809,137 Construction in process and advances plant suppliers (1) 74,121,374 92,285,397 (76,978,798 ) 1,379 (8,336,823 ) — 81,092,529 Spare parts for operation of the network 26,591,598 49,380,349 (44,626,488 ) 1,939 (2,902,869 ) — 28,444,529 Total 1,303,278,914 240,263,874 (140,581,001 ) 143,016 (117,432,346 ) — 1,285,672,457 Accumulated depreciation Network in operation and equipment 552,345,509 — (28,712,096 ) — (67,907,227 ) 104,279,361 560,005,547 Buildings 10,655,285 — (2,311,442 ) — (2,157,996 ) 2,625,102 8,810,949 Other assets 63,359,529 — (2,418,837 ) — (6,579,983 ) 22,172,785 76,533,494 Spare parts for operation of the network 575,393 — (160,696 ) — (131,429 ) 38,479 321,747 Total Ps. 626,935,716 Ps. — Ps. (33,603,071 ) Ps. — Ps. (76,776,635 ) Ps. 129,115,727 Ps. 645,671,737 Net Cost Ps. 676,343,198 Ps. 240,263,874 Ps. (106,977,930 ) Ps.143,016 Ps. (40,655,711 ) Ps. (129,115,727 ) Ps. 640,000,720 At December 31, 2018 Additions Retirements Business combinations Effect of translation of foreign subsidiaries and hyperinflation adjustment Depreciation for the year At December 31, 2019 Cost Network in operation and equipment Ps. 969,195,936 Ps. 82,992,062 Ps. (13,417,360 ) Ps. 9,572,805 Ps.(57,669,840 ) Ps. — Ps. 990,673,603 Land and buildings 57,130,326 1,530,677 (4,025,222 ) 115,935 (3,950,463 ) — 50,801,253 Other assets 149,809,137 26,881,611 (7,594,735 ) 1,021,051 (7,776,500 ) — 162,340,564 Construction in process and advances plant suppliers (1) 81,092,529 82,640,305 (76,892,011 ) 209,790 (5,511,439 ) — 81,539,174 Spare parts for operation of the network 28,444,529 44,776,904 (36,525,735 ) — (2,462,605 ) — 34,233,093 Total 1,285,672,457 238,821,559 (138,455,063 ) 10,919,581 (77,370,847 ) — 1,319,587,687 Accumulated depreciation Network in operation and equipment 560,005,547 — (24,954,514 ) — (47,778,627 ) 93,097,695 580,370,101 Buildings 8,810,949 — (287,072 ) — (1,386,974 ) 2,330,405 9,467,308 Other assets 76,533,494 — (695,425 ) — (4,754,982 ) 19,249,104 90,332,191 Spare parts for operation of the network 321,747 — (283,986 ) — (79,226 ) 116,182 74,717 Total Ps. 645,671,737 Ps. — Ps. (26,220,997 ) Ps. — Ps.(53,999,809 ) Ps. 114,793,386 Ps. 680,244,317 Net Cost Ps. 640,000,720 Ps. 238,821,559 Ps. (112,234,066 ) Ps. 10,919,581 Ps.(23,371,038 ) Ps. (114,793,386 ) Ps. 639,343,370 At December 31, 2019 Additions Retirements Business combinations Revaluation Transfers Effect of translation of foreign subsidiaries and hyperinflation adjustment Depreciation for the year At December 31, 2020 Cost Network in operation and equipment Ps. 990,673,603 Ps. 90,387,449 Ps. (19,574,391 ) Ps. 996,974 Ps. 107,152,628 Ps. (62,050,212 ) Ps. (49,993,808 ) Ps. — Ps. 1,057,592,243 Land and buildings 50,801,253 570,062 (2,853,037 ) — — — 369,300 — 48,887,578 Other assets 162,340,564 17,474,218 (14,454,598 ) 55,848 — — (8,393,187 ) — 157,022,845 Construction in process and advances plant suppliers (1) 81,539,174 59,635,316 (68,661,847 ) 1,099 — — (5,011,829 ) — 67,501,913 Spare parts for operation of the network 34,233,093 30,721,413 (37,829,818 ) — — — (2,328,430 ) — 24,796,258 Total 1,319,587,687 198,788,458 (143,373,691 ) 1,053,921 107,152,628 (62,050,212 ) (65,357,954 ) — 1,355,800,837 Accumulated depreciation Network in operation and equipment 580,370,101 — (25,726,856 ) — — (62,050,212 ) (2) (58,055,450 ) 96,729,723 531,267,306 Buildings 9,467,308 — (1,663,796 ) — — — (622,253 ) 1,906,140 9,087,399 Other assets 90,332,191 — (9,317,821 ) — — — (5,120,175 ) 16,549,822 92,444,017 Spare parts for operation of the network 74,717 — (176,131 ) — — — 38,898 135,000 72,484 Total Ps. 680,244,317 Ps. — Ps. (36,884,604 ) Ps. — Ps. — Ps. (62,050,212 ) Ps. (63,758,980 ) Ps. 115,320,685 Ps. 632,871,206 Net Cost Ps. 639,343,370 Ps. 198,788,458 Ps. (106,489,087 ) Ps. 1,053,921 Ps. 107,152,628 Ps. — Ps. (1,598,974 ) Ps. (115,320,685 ) Ps. 722,929,631 (1) Construction in progress includes fixed and mobile network facilities as well as satellite developments and fiber optic which is in the process of being installed. (2) This transfer relates to the accumulated depreciation as at the revaluation date that was eliminated against the gross carrying amount of the revalued asset.
Schedule of Relevant Information Related to Computation of Capitalized Borrowing Costs	Year ended December 31, 2018 2019 2020 Amount invested in the acquisition of qualifying assets Ps. 45,456,630 Ps. 50,783,957 Ps. 46,528,232 Capitalized interest 2,020,288 2,233,358 1,771,613 Capitalization rate 4.4 % 4.4 % 3.8 %
Summary of fair value measurement for the revalued telecommunications towers	2020 Book value as of December 31, 2020 (cost model) Ps.615,777,003 Supplement for change in accounting policy 107,152,628 Book value and fair value as of December 31, 2020 (revaluation model) 722,929,631

Intangible assets, net and go_2

Intangible assets, net and goodwill (Tables)	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Summary of Analysis of Intangible Assets	a) For the year ended December 31, 2018 Balance at Acquisitions Acquisitions Disposals and Amortization Effect of Balance at end Licenses and rights of use Ps. 247,413,824 Ps. 4,227,244 Ps. — Ps. 1,508,274 Ps. — Ps. (19,670,368 ) Ps. 233,478,974 Accumulated amortization (134,109,438 ) — — (1,005,877 ) (11,347,089 ) 16,281,825 (130,180,579 ) Net 113,304,386 4,227,244 — 502,397 (11,347,089 ) (3,388,543 ) 103,298,395 Trademarks 28,779,212 159,958 6,631 — — (738,635 ) 28,207,166 Accumulated amortization (18,841,405 ) — — — (4,973,602 ) 275,046 (23,539,961 ) Net 9,937,807 159,958 6,631 — (4,973,602 ) (463,589 ) 4,667,205 Customer relationships 26,985,714 74,637 15,556 — — (1,532,839 ) 25,543,068 Accumulated amortization (16,129,495 ) — — — (3,754,312 ) 1,122,270 (18,761,537 ) Net 10,856,219 74,637 15,556 — (3,754,312 ) (410,569 ) 6,781,531 Software licenses 15,055,598 2,004,550 3,006 (905,610 ) — (1,848,286 ) 14,309,258 Accumulated amortization (7,815,161 ) — — 2,677,848 (3,491,629 ) 924,139 (7,704,803 ) Net 7,240,437 2,004,550 3,006 1,772,238 (3,491,629 ) (924,147 ) 6,604,455 Content rights 6,717,442 850,779 — — — (18,512 ) 7,549,709 Accumulated amortization (4,516,665 ) — — — (2,231,978 ) (14,949 ) (6,763,592 ) Net 2,200,777 850,779 — — (2,231,978 ) (33,461 ) 786,117 Total of intangibles, net Ps. 143,539,626 Ps. 7,317,168 Ps. 25,193 Ps. 2,274,635 Ps. (25,798,610 ) Ps. (5,220,309 ) Ps. 122,137,703 Goodwill Ps. 151,463,232 Ps. — Ps. 334,739 Ps. (1,094,861 ) — Ps. (5,136,613 ) Ps. 145,566,497 For the year ended December 31, 2019 Balance at Acquisitions Acquisitions Disposals and Amortization Effect of Balance at end Licenses and rights of use Ps. 233,478,974 Ps. 13,206,877 Ps. 7,844,339 Ps. 7,286,114 Ps. — Ps. (15,715,442 ) Ps. 246,100,862 Accumulated amortization (130,180,579 ) — — (2,391,624 ) (11,577,160 ) 9,481,480 (134,667,883 ) Net 103,298,395 13,206,877 7,844,339 4,894,490 (11,577,160 ) (6,233,962 ) 111,432,979 Trademarks 28,207,166 53,467 — (6,012 ) — (835,613 ) 27,419,008 Accumulated amortization (23,539,961 ) — — — (1,008,483 ) 618,145 (23,930,299 ) Net 4,667,205 53,467 — (6,012 ) (1,008,483 ) (217,468 ) 3,488,709 Customer relationships 25,543,068 20,248 — 5,507 — (2,693,812 ) 22,875,011 Accumulated amortization (18,761,537 ) — — — (3,371,924 ) 2,357,831 (19,775,630 ) Net 6,781,531 20,248 — 5,507 (3,371,924 ) (335,981 ) 3,099,381 Software licenses 14,309,258 2,729,480 — (949,858 ) — (2,984,770 ) 13,104,110 Accumulated amortization (7,704,803 ) — — (1 ) (2,479,088 ) 2,183,149 (8,000,743 ) Net 6,604,455 2,729,480 — (949,859 ) (2,479,088 ) (801,621 ) 5,103,367 Content rights 7,549,709 1,427,694 — 1,638,007 — (455,228 ) 10,160,182 Accumulated amortization (6,763,592 ) — — (8,720 ) (1,772,779 ) 429,862 (8,115,229 ) Net 786,117 1,427,694 — 1,629,287 (1,772,779 ) (25,366 ) 2,044,953 Total of intangibles, net Ps. 122,137,703 Ps. 17,437,766 Ps. 7,844,339 Ps. 5,573,413 Ps. (20,209,434 ) Ps. (7,614,398 ) Ps. 125,169,389 Goodwill Ps. 145,566,497 Ps. — Ps. 10,869,571 Ps. (843,005 ) — Ps. (2,693,262 ) Ps. 152,899,801 For the year ended December 31, 2020 Balance at beginning of year Acquisitions Acquisitions in business combinations Disposals and other Amortization of the year Effect of translation of foreign subsidiaries and Hyperinflation adjustment Balance at end of year Licenses and rights of use Ps. 246,100,862 Ps. 15,079,714 Ps. 4,436,313 Ps. 1,502,981 Ps. — Ps. (14,029,709 ) Ps. 253,090,161 Accumulated amortization (134,667,883 ) — — 105,892 (14,274,497 ) 14,227,424 (134,609,064 ) Net 111,432,979 15,079,714 4,436,313 1,608,873 (14,274,497 ) 197,715 118,481,097 Trademarks 27,419,008 162,309 12,110 4,000 — 1,534,938 29,132,365 Accumulated amortization (23,930,299 ) — — (4,276 ) (300,727 ) (1,119,645 ) (25,354,947 ) Net 3,488,709 162,309 12,110 (276 ) (300,727 ) 415,293 3,777,418 Customer relationships 22,875,011 1,935 2,689,718 (5,763 ) — 4,018,365 29,579,266 Accumulated amortization (19,775,630 ) — — 855 (1,654,237 ) (3,996,593 ) (25,425,605 ) Net 3,099,381 1,935 2,689,718 (4,908 ) (1,654,237 ) 21,772 4,153,661 Software licenses 13,104,110 2,445,784 36 (2,485,429 ) — 4,236,645 17,301,146 Accumulated amortization (8,000,743 ) — — 2,013,617 (2,667,870 ) (3,578,452 ) (12,233,448 ) Net 5,103,367 2,445,784 36 (471,812 ) (2,667,870 ) 658,193 5,067,698 Content rights 10,160,182 1,570,415 — (313,942 ) — 619,657 12,036,312 Accumulated amortization (8,115,229 ) — — — (1,440,749 ) (503,241 ) (10,059,219 ) Net 2,044,953 1,570,415 — (313,942 ) (1,440,749 ) 116,416 1,977,093 Total of intangibles, net Ps. 125,169,389 Ps. 19,260,157 Ps. 7,138,177 Ps. 817,935 Ps. (20,338,080 ) Ps. 1,409,389 Ps. 133,456,967 Goodwill Ps. 152,899,801 Ps. — Ps. (7,014,120 ) Ps. (537,343 ) Ps. — Ps. (2,295,479 ) Ps. 143,052,859
Summary of Aggregate Carrying Amount of Goodwill	b) The aggregate carrying amount of goodwill is allocated as follows: 2019 2020 Europe Ps. 52,950,325 Ps. 53,388,139 Brazil 28,062,398 18,730,686 Puerto Rico 17,463,394 17,463,394 Dominican Republic 14,186,723 14,186,723 Colombia 12,124,685 12,253,743 México 10,148,380 10,148,380 Peru 2,739,947 2,710,979 Chile 2,364,816 2,558,098 El Salvador 2,499,552 2,499,544 United States (Tracfone) 3,220,105 3,362,900 Ecuador 2,155,384 2,155,384 Guatemala 3,245,613 2,301,533 Other countries 1,738,479 1,293,356 Ps. 152,899,801 Ps. 143,052,859

Business combinations, acquis_2

Business combinations, acquisitions and non-controlling interest (Tables)	12 Months Ended
	Dec. 31, 2020
Disclosure of detailed information about business combination [line items]
Summary of Selected Financial Data From Consolidated Statements of Financial Position	Selected financial data from the consolidated statements of financial position December 31, 2019 2020 Assets: Current assets Ps. 29,516,038 Ps. 32,775,046 Non-current 137,724,390 150,747,947 Total assets Ps.167,240,428 Ps.183,522,993 Liabilities and equity: Current liabilities Ps. 34,608,254 Ps. 49,942,415 Non-current 89,711,288 82,293,652 Total liabilities 124,319,542 132,236,067 Equity attributable to equity holders of the parent 21,864,132 26,129,649 Non-controlling (1) 21,056,754 25,157,277 Total equity Ps. 42,920,886 Ps. 51,286,926 Total liabilities and equity Ps.167,240,428 Ps.183,522,993
Summary of Consolidated Statements of Comprehensive Income	Summarized consolidated statements of comprehensive income For the year ended December 31, 2018 2019 2020 Operating revenues Ps.100,716,444 Ps.98,420,289 Ps.111,472,191 Operating costs and expenses 95,984,880 89,732,428 98,312,325 Operating income Ps. 4,731,564 Ps. 8,687,861 Ps. 13,159,866 Net income Ps. 3,809,694 Ps. 5,051,145 Ps. 7,787,388 Total comprehensive income Ps. 5,047,838 Ps. 1,466,783 Ps. 12,103,406 Net income attributable to: Equity holders of the parent Ps. 1,942,944 Ps. 2,565,733 Ps. 3,986,412 Non-controlling 1,866,750 2,485,412 3,800,976 Ps. 3,809,694 Ps. 5,051,145 Ps. 7,787,388 Comprehensive income attributable to: Equity holders of the parent Ps. 2,574,397 Ps. 748,059 Ps. 6,172,737 Non-controlling 2,473,441 718,724 5,930,669 Ps. 5,047,838 Ps. 1,466,783 Ps. 12,103,406
ClaroTelefnica Moviles Guatemala SA [Member]
Disclosure of detailed information about business combination [line items]
Summary of Financial Statements and the Values of the Assets Acquired and Liabilities	The purchase accounting is completed as of the date of the financial statements and the values of the assets acquired and liabilities assumed are as follows: 2019 amounts at the Current assets Ps. 1,312,906 Other non-current 257,853 Intangible assets (excluding goodwill) 1,354,105 Property, plant and equipment 4,144,334 Rights-of-use 864,046 Total assets acquired 7,933,244 Accounts payable 1,248,470 Other liabilities 1,705,580 Total liabilities assumed 2,954,050 Fair value of assets acquired a liabilities assumed-net 4,979,194 Acquisition Price 6,174,330 Goodwill Ps. 1,195,136
Nextel Telecomunicacoes Ltda [member]
Disclosure of detailed information about business combination [line items]
Summary of Financial Statements and the Values of the Assets Acquired and Liabilities	The final amounts as of the date of the financial statement and the values of the assets acquired and liabilities ass u med are as foll o 2019 amounts at the acquisition date Current assets Ps. 6,366,943 Other non-current assets 5,970,810 Intangible assets (excluding goodwill) 12,914,175 Property, plant and equipment 5,147,093 Rights-of-use assets 8,086,655 Total assets acquired 38,485,676 Accounts payable 9,170,230 Other liabilities 22,504,097 Total liabilities assumed 31,674,327 Fair value of assets acquired a liabilities assumed-net 6,811,349 Purchase consideration transferred 8,723,721 Goodwill Ps. 1,912,372

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Summary of Composition of Income Tax Expense	The composition of income tax expense for the years ended December 31, 2018, 2019 and 2020 is as follows: 2018 2019 2020 In Mexico: Current year income tax Ps. 28,572,414 Ps. 26,295,431 Ps. 13,407,948 Deferred income tax (2,688,727 ) 208,658 (9,334,246 ) Foreign: Current year income tax 19,898,728 20,843,720 15,250,218 Deferred income tax 694,664 3,685,724 (2,957,768 ) Ps. 46,477,079 Ps. 51,033,533 Ps. 16,366,152
Summary of Deferred Tax Related to Items Recognized in OCI	Deferred tax related to items recognized in OCI during the year: For the years ended December 31, 2018 2019 2020 Remeasurement of defined benefit plans Ps. 408,735 Ps.9,217,320 Ps. 4,151,600 Equity investments at fair value 1,613,667 (378,606 ) (665,814 ) Other (8,922 ) — (35,670 ) Revaluation assets — — (29,922,597 ) Deferred tax benefit recognized in OCI Ps.2,013,480 Ps.8,838,714 Ps.(26,472,481 )
Summary of Reconciliation of Statutory Income Tax Rate in Mexico to Consolidated Effective Income Tax Rate Recognized	Year ended December 31, 2018 2019 2020 Statutory income tax rate in Mexico 30.0 % 30.0 % 30.0 % Impact of non-deductible non-taxable Tax inflation effects 7.3 % 3.5 % 6.1 % Derivatives 0.4 % (0.1 %) (0.7 %) Employee benefits 1.3 % 1.8 % 3.0 % Other 6.3 % 1.8 % (2.4 %) Effective tax rate on Mexican operations 45.3 % 37.0 % 36.0 % Tax recoveries in Brazil — — (9.3 %) Dividends received from associates Equity (0.8 %) (0.4 %) (0.9 %) Foreign subsidiaries and other non-deductible 1.5 % 5.5 % (1.5 %) Effective tax rate 46.0 % 42.1 % 24.3 %
Summary of Analysis of Temporary Differences Giving Rise to Net Deferred Tax Liability	An analysis of temporary differences giving rise to the net deferred tax liability is as follows: Consolidated statements of financial position Consolidated statements of net income 2019 2020 2018 2019 2020 Provisions Ps. 17,964,305 Ps. 19,312,081 Ps. 1,841,705 Ps. (257,070 ) Ps. 4,458,848 Deferred revenues 5,820,260 6,748,101 3,632,051 (1,077,259 ) 897,762 Tax losses carry forward 26,630,407 25,121,933 (5,833,660 ) (9,873 ) 2,236,244 Property, plant and equipment (1) (11,962,544 ) (39,459,549 ) 453,493 (461,594 ) 3,524,761 Inventories 1,787,065 (537,404 ) 81,270 (291,531 ) (2,393,979 ) Licenses and rights of use (1) (3,399,931 ) (5,177,924 ) 961,402 432,403 344,729 Employee benefits 41,743,744 45,467,827 1,128,209 (1,019,042 ) 422,473 Other 9,491,550 14,828,012 (270,407 ) (1,210,417 ) 2,801,176 Net deferred tax assets Ps. 88,074,856 Ps. 66,303,077 Deferred tax expense in net profit for the year Ps. 1,994,063 Ps. (3,894,383 ) Ps. 12,292,014 (1) As of December 31, 2020 the balance included the effects of hyperinflation and revaluation of telecommunications towers.
Summary of Reconciliation of Deferred Tax Assets and Liabilities, Net	Reconciliation of deferred tax assets and liabilities, net: 2018 2019 2020 Opening balance as of January 1, Ps. 104,573,985 Ps. 86,613,327 Ps. 88,074,856 Deferred tax benefit 1,994,063 (3,894,38 3 ) 12,292,014 Translation effect (8,854,010 ) 2,047,91 5 375,105 Deferred tax benefit recognized in OCI 2,013,480 8,838,714 (26,472,481 ) Deferred taxes acquired in business combinations (25,827 ) (276,568 ) (2,580,552 ) Hyperinflationary effect in Argentina (4,907,151 ) (5,254,149 ) (5,385,865 ) Effect of adoption of IFRS 9 544,628 — — Effect of adoption of IFRS 15 (8,725,841 ) — — Closing balance as of December 31, Ps. 86,613,327 Ps. 88,074,856 Ps. 66,303,077 Presented in the consolidated statements of financial position as follows: Deferred income tax assets Ps.111,186,768 Ps.106,167,897 Ps.115,370,240 Deferred income tax liabilities (24,573,441 ) (18,093,041 ) (49,067,163 ) Ps. 86,613,327 Ps. 88,074,856 Ps. 66,303,077
Available Tax Loss Carryforwards Recorded in Deferred Tax Assets	a) At December 31, 2020, the available tax loss carryforwards recorded in deferred tax assets are as follows on a country by country ba s is: Country Gross balance of available tax loss carryforwards at December 31, 2020 Tax-effected loss carryforward benefit Brazil Ps. 44,578,152 Ps. 15,156,572 Mexico 20,523,070 6,156,920 Austria 11,631,381 2,907,845 United States 3,023,441 786,095 Peru 380,770 112,327 Puerto Rico 5,574 2,174 Total Ps. 80,142,388 Ps. 25,121,933

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Summary of Short- and Long-Term Debt	The Company’s short-and long-term debt consists of the following: At December 31, 2019 (Thousands of Mexican pesos) Currency Loan Interest rate Maturity Total Senior Notes U.S. dollars Fixed-rate Senior notes (i) 5.000% 2020 Ps. 11,774,764 Fixed-rate Senior notes (i) 3.125% 2022 30,152,320 Fixed-rate Senior notes (i) 3.625% 2029 18,845,200 Fixed-rate Senior notes (i) 6.375% 2035 18,493,360 Fixed-rate Senior notes (i) 6.125% 2037 6,958,119 Fixed-rate Senior notes (i) 6.125% 2040 37,690,400 Fixed-rate Senior notes (i) 4.375% 2042 21,671,980 Fixed-rate Senior notes (i) 4.375% 2049 23,556,500 Subtotal U.S. dollars Ps.169,142,643 Mexican pesos Domestic Senior notes (i) 8.600% 2020 Ps. 7,000,000 Fixed-rate Senior notes (i) 6.450% 2022 22,500,000 Fixed-rate Senior notes (i) 7.125% 2024 11,000,000 Domestic Senior notes (i) 0.000% 2025 4,757,592 Fixed-rate Senior notes (i) 8.460% 2036 7,871,700 Domestic Senior notes (i) 8.360% 2037 5,000,000 Subtotal Mexican pesos Ps. 58,129,292 Euros Commercial Paper (iv) -0.230% 2020 Ps. 2,599,128 Exchangeable Bond (i) 0.000% 2020 60,051,270 Fixed-rate Senior notes (i) 3.000% 2021 21,131,123 Fixed-rate Senior notes (i) 3.125% 2021 15,848,342 Fixed-rate Senior notes (i) 4.000% 2022 15,848,342 Fixed-rate Senior notes (i) 4.750% 2022 15,848,342 Fixed-rate Senior notes (i) 3.500% 2023 6,339,337 Fixed-rate Senior notes (i) 3.259% 2023 15,848,342 Fixed-rate Senior notes (i) 1.500% 2024 17,961,454 Fixed-rate Senior notes (i) 1.500% 2026 15,848,342 Fixed-rate Senior notes (i) 0.750% 2027 21,131,123 Fixed-rate Senior notes (i) 2.125% 2028 13,735,230 Subtotal Euros Ps.222,190,375 Pound Sterling Fixed-rate Senior notes (i) 5.000% 2026 Ps. 12,491,541 Fixed-rate Senior notes (i) 5.750% 2030 16,239,003 Fixed-rate Senior notes (i) 4.948% 2033 7,494,924 Fixed-rate Senior notes (i) 4.375% 2041 18,737,311 Subtotal Pound Sterling Ps. 54,962,779 Brazilian reais Debentures (i) 102.900% of CDI 2020 Ps. 7,013,124 Debentures (i) 104.000% of CDI 2021 5,142,958 Debentures (i) 104.250% of CDI 2021 7,083,256 Promissory notes (i) CDI + 0.600% 2021 1,683,150 Promissory notes (i) 106.000% of CDI 2022 9,350,832 Promissory notes (i) 106.500% of CDI 2022 4,675,416 Subtotal Brazilian reais Ps. 34,948,736 Other currencies Japanese yen Fixed-rate Senior notes (i) 2.950% 2039 Ps. 2,255,663 Subtotal Japanese yen Ps. 2,255,663 Chilean pesos Fixed-rate Senior notes (i) 3.961% 2035 Ps. 3,562,695 Subtotal Chilean pesos Ps. 3,562,695 Subtotal other currencies Ps. 5,818,358 Hybrid Notes Euros Euro NC10 Series B Capital Securities (iii) 6.375% 2073 Ps. 11,622,118 Subtotal Euros Ps. 11,622,118 Pound Sterling GBP NC7 Capital Securities (iii) 6.375% 2073 Ps. 13,740,695 Subtotal Pound Sterling Ps. 13,740,695 Subtotal Hybrid Notes Ps. 25,362,813 Lines of Credit and others U.S. dollars Lines of credit (ii) 5.500% - 9.020% 2020 - 2024 Ps. 9,359,340 Mexican pesos Lines of credit (ii) TIIE + 0.050% - TIIE + 0.090% 2020 Ps. 22,000,000 Euros Lines of credit (ii) 0.030% 2020 Ps. 2,113,112 Peruvian Soles Lines of credit (ii) 3.550% - 3.700% 2020 - 2021 Ps. 15,351,211 Chilean pesos Lines of credit (ii) TAB + 0.350% 2021 Ps. 4,821,222 Financial Leases 8.700% - 8.970% 2020 - 2027 Ps. 54,596 Subtotal Lines of Credit and others Ps. 53,699,481 Total debt Ps.624,254,477 Less: Short-term debt and current portion of long-term debt Ps.129,172,033 Long-term debt Ps.495,082,444 At December 31, 2020 (Thousands of Mexican pesos) Currency Loan Interest rate Maturity Total Senior Notes U.S. dollars Fixed-rate Senior notes (i) 3.125% 2022 Ps. 31,917,920 Fixed-rate Senior notes (i) 3.625% 2029 19,948,700 Fixed-rate Senior notes (i) 2.875% 2030 19,948,700 Fixed-rate Senior notes (i) 6.375% 2035 19,576,258 Fixed-rate Senior notes (i) 6.125% 2037 7,365,559 Fixed-rate Senior notes (i) 6.125% 2040 39,897,400 Fixed-rate Senior notes (i) 4.375% 2042 22,941,005 Fixed-rate Senior notes (i) 4.375% 2049 24,935,875 Subtotal U.S. dollars Ps. 186,531,417 Mexican pesos Fixed-rate Senior notes (i) 6.450% 2022 Ps. 22,500,000 Fixed-rate Senior notes (i) 7.125% 2024 11,000,000 Domestic Senior notes (i) 0.000% 2025 4,911,181 Fixed-rate Senior notes (i) 8.460% 2036 7,871,700 Domestic Senior notes (i) 8.360% 2037 5,000,000 Subtotal Mexican pesos Ps. 51,282,881 Euros Fixed-rate Senior notes (i) 3.000% 2021 Ps. 24,369,332 Fixed-rate Senior notes (i) 3.125% 2021 18,276,999 Fixed-rate Senior notes (i) 4.000% 2022 18,276,999 Fixed-rate Senior notes (i) 4.750% 2022 18,276,999 Fixed-rate Senior notes (i) 3.500% 2023 7,310,800 Fixed-rate Senior notes (i) 3.259% 2023 18,276,999 Fixed-rate Senior notes (i) 1.500% 2024 20,713,932 Fixed-rate Senior notes (i) 1.500% 2026 18,276,999 Fixed-rate Senior notes (i) 0.750% 2027 24,369,332 Fixed-rate Senior notes (i) 2.125% 2028 15,840,066 Commercial Paper (iv) -0.230% -0.310% 2021 40,940,477 Subtotal Euros Ps. 224,928,934 Pound Sterling Fixed-rate Senior notes (i) 5.000% 2026 Ps. 13,634,936 Fixed-rate Senior notes (i) 5.750% 2030 17,725,417 Fixed-rate Senior notes (i) 4.948% 2033 8,180,962 Fixed-rate Senior notes (i) 4.375% 2041 20,452,405 Subtotal Pound Sterling Ps. 59,993,720 Brazilian reais Debentures (i) 104.000% of 2021 Ps. 4,222,597 Debentures (i) 104.250% of 2021 5,815,668 Promissory notes (i) CDI + 0.600% 2021 1,381,941 Debentures (i) CDI + 0.960% 2022 9,596,811 Promissory notes (i) 106.000% of 2022 7,677,449 Debentures (i) 106.500% of 2022 3,838,725 Subtotal Brazilian reais Ps. 32,533,191 Other currencies Japanese yen Fixed-rate Senior notes (i) 2.950% 2039 Ps. 2,511,701 Subtotal Japanese yen Ps. 2,511,701 Chilean pesos Fixed-rate Senior notes (i) 3.961% 2035 Ps. 4,078,453 Subtotal Chilean pesos Ps. 4,078,453 Subtotal other currencies Ps. 6,590,154 Hybrid Notes Euros Euro NC10 Series B Capital Securities (iii) 6.375% 2073 Ps. 13,403,133 Subtotal Euros Ps. 13,403,133 Subtotal Hybrid Notes Ps. 13,403,133 Lines of Credit and others Mexican pesos Lines of credit (ii) TIIE + 0.300% - 2021 Ps. 27,100,000 Peruvian Soles Lines of credit (ii) 1.200% - 1.450% 2021 Ps. 17,094,079 Chilean pesos Lines of credit (ii) TAB + 0.350% and 2021 Ps. 8,868,181 Financial Leases 8.700% - 8.970% 2021 - 2027 Ps. 57,266 Subtotal Lines of Credit and others Ps. 53,119,526 Total debt Ps. 628,382,956 Less: Short-term debt and current portion of long-term debt Ps. 148,083,184 Long-term debt Ps. 480,299,772
Summary of Short Term Debt Maturities	An analysis of the Company’s short-term debt maturities as of December 31, 2019, and December 31, 2020, is as follows: 2019 2020 Obligations and Senior Notes Ps. 88,438,286 Ps. 95,007,014 Lines of credit 40,722,004 53,062,260 Financial Leases 11,743 13,910 Total Ps. 129,172,033 Ps. 148,083,184 Weighted average interest rate 3.31 % 2.23 %
Summary of Long Term Debt Maturities	The Company’s long-term debt maturities as of December 31, 2020 are as follows: Years Amount 2022 Ps. 112,091,112 2023 25,594,561 2024 31,721,298 2025 and thereafter 310,892,801 Total Ps. 480,299,772
Summary of Senior Notes Outstanding	The outstanding Senior Notes at December 31, 2019, and December 31, 2020, are as follo w Currency* 2019 2020 U.S. dollars Ps. 169,142,643 Ps. 186,531,417 Mexican pesos 58,129,292 51,282,881 Euros** 222,190,375 183,988,456 Pounds sterling** 54,962,779 59,993,720 Brazilian reais 34,948,736 32,533,191 Japanese yens 2,255,663 2,511,701 Chilean pesos 3,562,695 4,078,453 * Thousands of Mexican peso s ** Includes secured and unsecured senior notes.

Right of use assets and lease_2

Right of use assets and lease debt (Tables)	12 Months Ended
	Dec. 31, 2020
Disclosure of Company right of use asset and Lease liabilities [Abstract]
Schedule of detailed information about right-of-use assets and lease liabilities	At December 31, 2019 and 2020 the right-of-use assets and lease liabilities are as follows: Right-of-use assets Liability related to right-of-use Towers & Sites Property Other Total As of January 1, 2019 Ps. 94,252,098 Ps. 21,075,884 Ps. 4,750,320 Ps. 120,078,302 Ps. 119,387,660 Additions and release 6,364,508 921,542 729,001 8,015,051 7,437,621 Business Combinations 9,668,507 — — 9,668,507 10,810,111 Modifications 7,474,469 1,288,974 728,837 9,492,280 8,363,045 Depreciation (17,286,497 ) (4,941,222 ) (1,365,847 ) (23,593,566 ) — Interest expense — — — — 7,940,240 Payments — — — — (26,765,075 ) Translation adjustment (4,370,636 ) (905,808 ) (380,907 ) (5,657,351 ) (6,576,869 ) Balance at December 31, 2019 Ps. 96,102,449 Ps. 17,439,370 Ps. 4,461,404 Ps. 118,003,223 Ps. 120,596,733 Balance at the beginning of the year Ps. 96,102,449 Ps. 17,439,370 Ps. 4,461,404 Ps. 118,003,223 Ps. 120,596,733 Additions and release 5,745,869 309,576 1,514,519 7,569,964 4,833,959 Modifications 8,559,335 (3,035,831 ) 1,048,858 6,572,362 7,769,326 Depreciation (22,064,413 ) (3,440,428 ) (2,866,244 ) (28,371,085 ) — Interest expense — — — — 9,134,288 Payments — — — — (29,623,565 ) Translation adjustment (3,124,365 ) 932,748 393,997 (1,797,620 ) (3,383,500 ) Balance at December 31, 2020 Ps. 85,218,875 Ps. 12,205,435 Ps. 4,552,534 Ps. 101,976,844 Ps. 109,327,241
Schedule of maturity of lease liabilities	The lease debt of the Company is integrated according to its maturities as follows: 2020 Short term Ps. 25,067,905 Long term 84,259,336 Total Ps. 109,327,241 The Company’s long-term debt maturities as of December 31, 2020 are as foll o ws: Year ended December 31, 2022 Ps. 35,744,268 2023 12,778,050 2024 9,606,195 2025 and thereafter 26,130,823 Total Ps. 84,259,336
Summary of lease cost recognized expenses	During the years ended December 31 2019 and 2020, the Company recognized expenses as follows: 2019 Others Related parties Total Depreciation expense of right-of-use Ps.18,176,521 Ps.5,417,045 Ps.23,593,566 Interest expense on lease liabilities 5,654,721 2,285,519 7,940,240 Expense relating to short-term leases 1,978,403 1,958 1,980,361 Expense relating to leases of low-value 25,935 — 25,935 Variable lease payments 1,299,502 — 1,299,502 Total Ps.27,135,082 Ps.7,704,522 Ps.34,839,604 2020 Others Related parties Total Depreciation expense of right-of-use Ps.22,404,924 Ps.5,966,161 Ps.28,371,085 Interest expense on lease liabilities 7,081,693 2,052,595 9,134,288 Expense relating to short-term leases 32,238 — 32,238 Expense relating to leases of low-value 2,883 — 2,883 Variable lease payments 78,494 — 78,494 Total Ps.29,600,232 Ps.8,018,756 Ps.37,618,988

Accounts payable, accrued lia_2

Accounts payable, accrued liabilities and asset retirement obligations (Tables)	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Components Account Payable and Accrued Liabilities	a) At December 31, 2019 2020 Suppliers Ps.113,370,716 Ps.74,285,881 Sundry creditors 90,849,195 101,406,307 Interest payable 8,057,170 7,661,762 Guarantee deposits from customers 1,467,835 1,386,645 Dividends payable 2,367,908 2,254,877 Total Ps.216,112,824 Ps.186,995,472
Summary of Balance of Accrued Liabilities	b) At December 31, 2019 2020 Current liabilities Direct employee benefits payable Ps. 17,991,283 Ps. 18,965,160 Contingencies 34,379,969 31,326,691 Total Ps. 52,371,252 Ps. 50,291,851
Summary of Movements in Contingent Liabilities	The movements in contingencies for the years ended December 31, 2019 and 2020 are as follows: Balance at December 31, 2018 Business combination Effect of translation Increase of the year Applications Reclassification Balance at December 31, 2019 Payments Reversals Contingencies Ps. 40,281,573 Ps. 1,378,611 Ps. (2,302,058 ) Ps. 6,410,975 Ps. (5,483,327 ) Ps. (1,833,518 ) Ps. (4,072,287 ) Ps. 34,379,969 Balance at December 31, 2019 Business combination Effect of translation Increase of the year Applications Balance at December 31, 2020 Payments Reversals Contingencies Ps. 34,379,969 Ps. 292 Ps. (4,290,753 ) Ps. 7,442,292 Ps. (3,214,407 ) Ps. (2,990,702 ) Ps. 31,326,691
Summary of Movements in Asset Retirement Obligations	c) Balance at Business Effect of Increase of Applications Balance at Payments Reversals Asset retirement obligations Ps. 15,971,601 Ps. 293,548 Ps. (1,339,033 ) Ps. 1,600,197 Ps. (128,842 ) Ps. (580,727 ) Ps. 15,816,744 Balance at December 31, 2019 Business Effect of translation Increase of the year Applications Balance at December 31, 2020 Payments Reversals Asset retirement obligations Ps. 15,816,744 Ps. — Ps. 374,418 Ps. 2,412,908 Ps. (593,644 ) Ps. (122,435 ) Ps. 17,887,991

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Purchase Commitments	As of December 31, 2020, the total amounts equivalent to the contract period are detailed below: Year ended December 31, 2021 Ps. 74,446,526 2022 37,345,449 2023 2,240,297 2024 and thereafter 13,555,946 Total Ps. 127,588,218

Employee Benefits (Tables)

Employee Benefits (Tables)	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Analysis of the Net Liability and Net Period Cost for Employee Benefit	An analysis of the net liability and net period cost for employee benefits is as follows: At December 31, 2019 2020 Mexico Ps. 116,537,660 Ps. 129,260,355 Puerto Rico 13,228,592 14,924,874 Brazil 9,503,738 8,913,548 Europe 12,827,318 14,392,445 Ecuador 409,750 488,161 El Salvador 154,422 Nicaragua 61,337 Honduras 35,060 Total Ps. 152,507,058 Ps. 168,230,202 For the year ended December 31 2018 2019 2020 Mexico Ps. 12,046,208 Ps. 12,788,464 Ps. 14,911,208 Puerto Rico 686,067 747,755 664,046 Brazil 579,432 511,964 722,412 Europe 619,039 2,526,957 1,701,424 Ecuador 58,354 34,425 67,402 El Salvador 15,751 Nicaragua 3,711 13,989,100 Ps. 16,609,565 Ps. 18,085,954
Summary of Defined Benefit Obligation (DBO) and Plan Assets for the Pension and Other Benefit Obligation Plans	The defined benefit obligation (DBO) and plan assets for the pension and other benefit obligation plans, by country, are as follows: At December 31 2019 2020 DBO Plan Assets Effect of Net employee DBO Plan Assets Effect of Net employee Mexico Ps. 280,602,176 Ps. (164,910,346 ) Ps. Ps. 115,691,830 Ps. 278,434,302 Ps. (150,090,481 ) Ps. Ps. 128,343,821 Puerto Rico 35,803,893 (22,575,301 ) 13,228,592 40,240,193 (25,315,319 ) 14,924,874 Brazil 21,412,097 (18,815,174 ) 4,428,021 7,024,944 18,568,932 (16,143,783 ) 3,393,640 5,818,789 Europe 4,538,543 4,538,543 5,490,873 5,490,873 Total Ps. 342,356,709 Ps. (206,300,821 ) Ps. 4,428,021 Ps. 140,483,909 Ps. 342,734,300 Ps. (191,549,583 ) Ps. 3,393,640 Ps. 154,578,357
Summary of the Actuarial Results Generated for the Pension and Retirement Plans as well as the Medical Services	At December 31, 2018 DBO Plan Assets Effect of asset Net employee Balance at the beginning of the year Ps. 329,113,625 Ps. (227,688,604 ) Ps. 6,519,560 Ps. 107,944,581 Current service cost 3,322,813 3,322,813 Interest cost on projected benefit obligation 30,185,257 30,185,257 Expected return on plan assets (20,804,104 ) (20,804,104 ) Changes in the asset ceiling during the period and others 587,373 587,373 Past service costs and other 157,765 157,765 Actuarial gain for changes in experience (7,222 ) (7,222 ) Actuarial loss from changes in demographic assumptions 134,625 134,625 Actuarial gain from changes in financial assumptions (24,890 ) (24,890 ) Net period cost Ps. 33,610,583 Ps. (20,646,339 ) Ps. 587,373 Ps. 13,551,617 Actuarial gain for changes in experience (21,283,470 ) (21,283,470 ) Actuarial loss from changes in demographic assumptions 68,482 68,482 Actuarial gain from changes in financial assumptions (1,246,539 ) (1,246,539 ) Changes in the asset ceiling during the period and others (1,055,409 ) (1,055,409 ) Return on plan assets greater than discount rate (shortfall) 23,503,296 23,503,296 Recognized in other comprehensive income Ps. (22,461,527 ) Ps. 23,503,296 Ps. (1,055,409 ) Ps. (13,640 ) Contributions made by plan participants 173,722 (173,722 ) — Contributions to the pension plan made by the Company (1,565,792 ) (1,565,792 ) Benefits paid (19,546,541 ) 19,546,541 — Payments to employees (10,651,938 ) (10,651,938 ) Effect of translation (3,535,477 ) 3,353,498 (963,981 ) (1,145,960 ) Others Ps. (33,560,234 ) Ps. 21,160,525 Ps. (963,981 ) Ps. (13,363,690 ) Balance at the end of the year 306,702,447 (203,671,122 ) 5,087,543 108,118,868 Less short-term portion (212,141 ) (212,141 ) Non-current Ps. 306,490,306 Ps. (203,671,122 ) Ps. 5,087,543 Ps. 107,906,727 At December 31, 2019 DBO Plan Assets Effect of asset Net Balance at the beginning of the year Ps. 306,702,447 Ps. (203,671,122 ) 5,087,543 Ps. 108,118,868 Current service cost 2,591,975 2,591,975 Interest cost on projected benefit obligation 31,001,348 31,001,348 Expected return on plan assets (20,070,037 ) (20,070,037 ) Changes in the asset ceiling during the period and others 445,743 445,743 Past service costs and others 144,481 144,481 Actuarial gain for changes in experience (22,599 ) (22,599 ) Actuarial gain from changes in demographic assumptions (129 ) (129 ) Actuarial loss from changes in financial assumptions 36,163 36,163 Net period cost Ps. 33,606,758 Ps. (19,925,556 ) Ps. 445,743 Ps. 14,126,945 Actuarial loss for changes in experience 31,606,323 31,606,323 Actuarial gain from changes in demographic assumptions (339,657 ) (339,657 ) Actuarial loss from changes in financial assumptions 7,207,072 7,207,072 Changes in the asset ceiling during the period and others (712,064 ) (712,064 ) Return on plan assets greater than discount rate (shortfall) 423,514 423,514 Recognized in other comprehensive income Ps. 38,473,738 Ps. 423,514 Ps. (712,064 ) Ps. 38,185,188 Contributions made by plan participants 155,188 (155,188 ) — Contributions to the pension plan made by the Company (1,337,610 ) (1,337,610 ) Benefits paid (15,836,928 ) 15,836,928 — Payments to employees (16,996,920 ) (16,996,920 ) Effect of translation (3,534,509 ) 2,528,213 (393,201 ) (1,399,497 ) Others Ps. (36,213,169 ) Ps. 16,872,343 Ps. (393,201 ) Ps. (19,734,027 ) Balance at the end of the year 342,569,774 (206,300,821 ) 4,428,021 140,696,974 Less short-term portion (213,065 ) (213,065 ) Non-current Ps. 342,356,709 Ps. (206,300,821 ) Ps. 4,428,021 Ps. 140,483,909 At December 31, 2020 DBO Plan Assets Effect of asset celling Net employee benefit liability Balance at the beginning of the year Ps. 342,569,774 Ps. (206,300,821 ) Ps. 4,428,021 Ps. 140,696,974 Current service cost 2,810,584 2,810,584 Interest cost on projected benefit obligation 30,482,173 30,482,173 Expected return on plan assets (17,655,119 ) (17, 655,119 ) Changes in the asset ceiling during the period and others 278,639 278,639 Past service costs and other 148,253 148,253 Actuarial gain for changes in experience (8,945 ) (8,945 ) Actuarial gain from changes in demographic assumptions (270 ) (270 ) Actuarial loss from changes in financial assumptions 20,219 20,219 Net period cost Ps. 33,303,761 Ps. (17,506,866 ) Ps. 278,639 Ps. 16,075,534 Actuarial gain for changes in experience (9,677 ) (9,677 ) Actuarial gain from changes in demographic assumptions (103,987 ) (103,987 ) Actuarial loss from changes in financial assumptions 3,475,345 3,475,345 Changes in the asset ceiling during the period and others (542,430 ) (542,430 ) Return on plan assets greater than discount rate (shortfall) 12,320,777 12,320,777 Actuarial loss from changes in demographic assumptions (924,084 ) (924,084 ) Recognized in other comprehensive income Ps. 2,437,597 Ps. 12320,777 Ps. (542,430 ) Ps. 14,215,944 Contributions made by plan participants 137,947 (137,947 ) — Contributions to the pension plan made by the Company (1,882,654 ) (1,882,654 ) Benefits paid (19,740,727 ) 19,740,727 — Payments to employees (14,426,720 ) (14,426,720 ) Effect of translation (1,278,392 ) 2,217,201 (770,590 ) 168,219 Others Ps. (35,307,892 ) Ps. 19,937,327 Ps. (770,590 ) Ps. (16,141,155 ) Balance at the end of the year 343,003,240 (191,549,583 ) 3,393,640 154,847,297 Less short-term portion (268,940 ) (268,940 ) Non-current Ps. 342,734,300 Ps. (191,549,583 ) Ps. 3,393,640 Ps. 154,578,357
Schedule of Plan Assets Invested	Plan assets are invested in: At December 31 2019 2020 Puerto Rico Brazil Mexico Puerto Rico Brazil Mexico Equity instruments 41 % — 64 % 43 % — 68 % Debt instruments 58 % 94 % 36 % 22 % 95 % 32 % Others 1 % 6 % — 35 % 5 % — 100 % 100 % 100 % 100 % 100 % 100 %
Summary of Assumptions Used in Determining the Net Period Cost	2018 2019 2020 Puerto Brazil Mexico Europe Puerto Brazil Mexico Europe Puerto Brazil Mexico Europe 1.25%, 0.75%, 6.48% & 0.25%, 1.75% & 1.00% & 0.50% & Discount rate and long- term rate return 4.45% 9.10% 11.81% 2.00% 3.23% 7.03% 10.50% 1.25% 2.34% 7.39% 10.04% 0.75% 3.0.%, 3.00%, 3.00%, 3.5% & 3.5% & 3.5% & Rate of future salary increases 2.75% 4.00% 3.55% 4.40% 2.75% 3.80% 3.20% 4.40% 2.75% 3.25% 2.84% 4.10% Percentage of increase in health care costs for the coming year 3.87% 10.50% 3.18% 10.30% 2.28% 9.96% Year to which this level will be maintained N/A 2029 N/A 2029 N/A 2031 Rate of increase of pensions 1.60% 1.60% 1.60% Employee turnover rate* 0.0%-1.51% 0.00%-1.38% 0.00%-1.31% * Depending on years of service
Summary of Increase (Decrease) Would Have Resulted in the DBO Pension and Other Benefits	-100 points +100 points Discount rate Ps. 29,012,552 Ps. (25,541,956 ) Health care cost trend rat Ps. (665,934 ) Ps. 781,238
Summary of Long-Term Direct Employee Benefits	Balance at Effect of Increase of Applications Balance at Payments Reversals Long-term direct employee benefits Ps. 8,111,778 Ps. (518,180 ) Ps.2,528,224 Ps.(1,946,055 ) Ps. Ps.8,175,767 Balance at December 31, 2019 Effect of translation Increase of the year Applications Balance at December 31, 2020 Payments Reversals Long-term direct employee benefits Ps. 8,175,767 Ps. 1,256,880 Ps.1,729,392 Ps.(2,411,436 ) Ps. Ps.8,750,603

Financial Assets and Liabilit_2

Financial Assets and Liabilities (Tables)	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Summary of Categorization of the Financial Instruments, Excluding Cash and Cash Equivalents	Set out below is the categorization of the financial instruments, excluding cash and cash equivalents, held by the Company as of December 31, 2019 and 2020: December 31, 2019 Loans and Receivables Fair value through profit or loss Fair value through OCI Financial Assets: Equity investments at fair value through OCI and other short term investments Ps. 10,145,615 Ps. — Ps. 37,572,410 Accounts receivable from subscribers, distributors, contractual assets and other 196,217,010 — — Related parties 1,273,140 — — Derivative financial instruments — 6,825,760 — Total Ps. 207,635,765 Ps. 6,825,760 Ps. 37,572,410 Financial Liabilities: Debt Ps. 624,254,477 Ps. — Ps. — Liability related to right-of-use 120,596,733 — — Accounts payable 216,112,824 — — Related parties 3,460,419 — — Derivative financial instruments — 9,596,751 — Total Ps. 964,424,453 Ps. 9,596,751 Ps. — December 31, 2020 Loans and Receivables Fair value through profit or loss Fair value through OCI Financial Assets: Equity investments at fair value through OCI and other short term investments Ps. 4,603,284 Ps. — Ps. 50,033,111 Accounts receivable from subscribers, distributors, contractual assets and other 171,213,415 — — Related parties 1,391,300 — — Derivative financial instruments — 20,928,335 — Total Ps. 177,207,999 Ps. 20,928,335 Ps. 50,033,111 Financial Liabilities: Debt Ps. 628,382,956 Ps. — Ps. — Liability related to right-of-use 109,327,241 — — Accounts payable 186,995,472 — — Related parties 3,999,916 — — Derivative financial instruments — 14,230,249 — Total Ps. 928,705,585 Ps. 14,230,249 Ps. —
Summary of Fair Value for the Financial Assets (Excluding Cash and Cash Equivalents) and Financial Liabilities	The fair value for the financial assets (excluding cash and cash equivalents) and financial liabilities shown in the consolidated statements of financial position at December 31, 2019 and 2020 is as follows: Measurement of fair value at December 31, 2019 Level 1 Level 2 Level 3 Total Assets: Equity investments at fair value through OCI and other short-term investments Ps. 37,572,410 Ps. 10,145,615 Ps. — Ps. 47,718,025 Derivative financial instruments — 6,825,760 — 6,825,760 Pension plan assets 185,981,861 20,294,557 24,403 206,300,821 Total Ps. 223,554,271 Ps. 37,265,932 Ps. 24,403 Ps. 260,844,606 Liabilities: Debt Ps. 582,003,256 Ps. 101,667,421 Ps. — Ps. 683,670,677 Liability related to right-of-use of assets 120,596,733 — — 120,596,733 Derivative financial instruments — 9,596,751 — 9,596,751 Total Ps. 702,599,989 Ps. 111,264,172 Ps. — Ps. 813,864,161 Measurement of fair value at December 31, 2020 Level 1 Level 2 Level 3 Total Assets: Equity investments at fair value through OCI and other short-term investments Ps. 50,033,111 Ps. 4,603,284 Ps. — Ps. 54,636,395 Derivative financial instruments — 20,928,335 — 20,928,335 Revalued of assets — — 107,152,628 107,152,628 Pension plan assets 168,939,091 22,589,392 21,100 191,549,583 Total Ps. 218,972,202 Ps. 48,121,011 Ps. 107,173,728 Ps. 374,266,941 Liabilities: Debt Ps. 578,712,562 Ps. 135,645,912 Ps. — Ps. 714,358,474 Liability related to right-of-use of assets 109,327,241 — — 109,327,241 Derivative financial instruments — 14,230,249 — 14,230,249 Total Ps. 688,039,803 Ps. 149,876,161 Ps. — Ps. 837,915,964
Summary of Changes in Liabilities Arising From Financing Activities	Changes in liabilities arising from financing activities At December 31, At January 1, 2019 Cash flow Foreign currency exchange and other At December 31, 2019 Debt 638,922,453 — 8,273,440 (22,941,416 ) 624,254,477 Liability related to right-of-use — 119,387,660 (26,765,075 ) 27,974,148 120,596,733 Total liabilities from financing activities Ps. 638,922,453 Ps. 119,387,660 Ps. (18,491,635 ) Ps. 5,032,732 Ps. 744,851,210 At December 31, Cash flow Foreign currency exchange and other At December 31, 2020 Debt 624,254,477 (53,091,801 ) 57,220,280 628,382,956 Liability related to right-of-use 120,596,733 (29,623,565 ) 18,354,073 109,327,241 Total liabilities from Ps.744,851,210 Ps.(82,715,366 ) Ps.75,574,353 Ps.737,710,197

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Summary of Computation of The Basic and Diluted Earnings	The following table shows the computation of the basic and diluted earnings per share: For the years ended December 31, 2018 2019 2020 Net profit for the period attributable to equity holders of the parent Ps. 52,566,197 Ps. 67,730,891 Ps. 46,852,605 Weighted average shares (in millions) 66,055 66,016 66,265 Earnings per share attributable to equity holders of the parent Ps. 0.79 Ps. 1.03 Ps. 0.71

Components of other comprehen_2

Components of other comprehensive loss (Tables)	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Summary of Movement on the Components of the Other Comprehensive Loss	The movement on the components of the other comprehensive (loss) income for the years ended December 31, 2018, 2019 and 2020 is as follows: For the years ended December 31, 2018 2019 2020 Controlling interest: Unrealized (loss) gain on equity investments at fair value, net of deferred taxes (3,765,688 ) 883,408 (1,952,414 ) Translation effect of foreign entities (61,223,458 ) (34,010,066 ) (13,558,774 ) Remeasurement of defined benefit plan, net of deferred taxes 652,722 (29,153,554 ) (10,026,454 ) Assets revaluation surplus net of deferred taxes — — 64,835,155 Non-controlling (2,986,018 ) (1,908,304 ) 14,165,249 Other comprehensive (loss) income Ps.(67,322,442 ) Ps.(64,188,516 ) Ps.53,462,762

Valuation of derivatives, int_2

Valuation of derivatives, interest cost from labor obligations and other financial items, net (Tables)	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Schedule of Valuation of Derivatives and Other Financial Items	For the years ended December 31, 2018, 2019 and 2020, valuation of derivatives and other financial items are as follows: For the years ended December 31, 2018 2019 2020 Controlling interest: (Loss) gain in valuation of derivatives, net Ps. (4,686,407 ) Ps. 4,432,023 Ps. 12,378,193 Capitalized interest expense (Note 10 b) 2,020,288 2,233,358 1,771,613 Commissions (1,901,473 ) (2,820,477 ) (1,135,082 ) Interest cost of labor obligations (Note 18) (9,968,526 ) (11,377,054 ) (13,105,693 ) Interest expense on taxes (555,921 ) (516,522 ) (59,032 ) Dividend received (Note 4) 2,605,333 1,773,336 2,122,826 Gain on net monetary positions 4,429,145 4,267,194 3,262,512 Other financial cost (2,118,755 ) (5,067,200 ) (3,944,229 ) Total Ps. (10,176,316 ) Ps. (7,075,342 ) Ps. 1,291,108

Segments (Tables)

Segments (Tables)	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Summary of Operating Segments	Mexico Telmex Brazil Southern Cone Colombia Andean Central America U.S.A. Caribbean Europe Eliminations Consolidated total As of and for the year ended December 31, 2018 (in Ps.): External revenues 207,610,244 86,339,289 188,712,666 89,149,978 75,460,428 55,633,192 44,883,585 153,266,315 36,435,541 100,716,443 — 1,038,207,681 Intersegment revenues 16,946,543 9,741,908 4,593,760 13,200,358 344,517 154,082 149,445 — 204,294 — (45,334,907 ) — Total revenues 224,556,787 96,081,197 193,306,426 102,350,336 75,804,945 55,787,274 45,033,030 153,266,315 36,639,835 100,716,443 (45,334,907 ) 1,038,207,681 Depreciation and amortization 17,619,342 18,358,248 42,857,751 13,526,361 13,464,867 8,516,960 8,940,655 1,545,395 5,036,831 26,838,972 (992,802 ) 155,712,580 Operating income (loss) 57,450,599 8,085,764 23,494,903 16,975,797 14,388,552 5,003,915 4,867,763 2,665,270 5,811,846 4,731,562 (3,918,800 ) 139,557,171 Interest income 26,578,280 420,380 11,303,888 2,251,474 1,013,839 1,666,879 1,566,086 559,548 1,458,874 122,133 (36,295,212 ) 10,646,169 Interest expense 32,526,258 1,153,913 20,377,191 4,338,941 2,913,881 1,719,663 509,081 — 561,867 1,973,431 (34,302,793 ) 31,771,433 Income tax 28,842,505 643,377 4,026,444 1,390,039 2,251,877 2,498,666 2,533,600 810,898 2,774,204 707,093 (1,624 ) 46,477,079 Equity interest in net income (loss) of associated companies (5,962 ) 44,965 (152 ) (20,871 ) — — — — — (17,713 ) — 267 Net profit (loss) attributable to equity holders of the parent 23,185,029 (2,201,572 ) 3,530,653 6,065,703 9,165,801 1,730,933 2,821,733 2,820,505 3,644,697 3,809,694 (2,006,979 ) 52,566,197 Assets by segment 970,564,314 174,461,398 390,791,480 127,946,573 111,975,598 96,347,779 81,640,157 38,814,907 102,531,547 186,135,358 (851,985,719 ) 1,429,223,392 Plant, property and equipment, net 56,056,634 103,737,293 173,197,708 62,988,635 51,422,548 35,800,477 37,146,601 1,356,237 38,011,242 80,421,642 (138,297 ) 640,000,720 Goodwill 27,104,632 215,381 21,388,124 2,796,759 12,770,380 5,242,365 5,466,871 3,328,533 14,186,723 53,066,729 — 145,566,497 Trademarks, net 227,774 243,556 124,910 — — — — 507,033 249,984 3,313,948 — 4,667,205 Licenses and rights, net 10,573,147 — 25,873,910 12,555,496 3,400,235 9,651,582 3,605,416 — 10,294,336 27,344,273 — 103,298,395 Investment in associated companies 5,621,661 563,667 543 20,697 412 — 24,262 — — 748,674 (3,847,209 ) 3,132,707 Liabilities by segments 748,965,728 136,993,838 298,308,084 94,550,901 56,211,438 50,064,761 28,592,953 35,552,678 58,716,154 117,214,746 (441,820,311 ) 1,183,350,970 Mexico Telmex Brazil Southern Cone Colombia Andean Central America U.S.A. Caribbean Europe Eliminations Consolidated total As of and for the year ended December 31, 2019 (in Ps.): External revenues 226,164,232 84,173,980 177,596,077 54,230,682 74,274,684 55,440,675 46,602,036 155,864,392 34,580,822 98,420,289 — 1,007,347,869 Intersegment revenues 11,676,015 11,863,364 4,182,248 11,041,705 361,386 92,249 132,061 — 1,136,879 — (40,485,907 ) — Total revenues 237,840,247 96,037,344 181,778,325 65,272,387 74,636,070 55,532,924 46,734,097 155,864,392 35,717,701 98,420,289 (40,485,907 ) 1,007,347,869 Depreciation and amortization 24,742,622 16,346,927 39,424,474 13,847,506 13,439,489 10,256,129 11,045,817 1,396,422 6,322,648 24,975,146 (2,881,970 ) 158,915,210 Operating income (loss) 67,694,409 9,731,852 28,846,565 4,007,614 15,324,977 8,023,002 5,712,068 2,968,236 5,741,368 8,687,862 (1,897,418 ) 154,840,535 Interest income 23,713,455 1,839,973 3,155,681 896,256 1,306,571 1,283,788 532,046 324,932 1,478,560 115,359 (28,361,949 ) 6,284,672 Interest expense 30,972,658 1,439,785 19,021,965 3,849,318 2,952,123 2,422,887 1,406,720 385 1,435,862 2,220,168 (27,810,532 ) 37,911,339 Income tax 30,000,511 1,528,229 4,251,116 2,022,336 5,405,452 1,681,159 2,355,380 1,119,478 719,774 1,946,255 3,843 51,033,533 Equity interest in net income (loss) of associated companies (3,732 ) 46,789 (1,538 ) (23,424 ) — — (28,795 ) — — (6,909 ) — (17,609 ) Net profit (loss) attributable to equity holders of the parent 42,598,946 (1,705,068 ) 5,618,095 (6,984 ) 9,571,046 (2,604,646 ) 2,335,963 2,095,807 4,312,630 5,051,145 463,957 67,730,891 Assets by segment 915,233,048 201,283,526 382,561,753 132,722,497 115,851,227 94,021,632 77,355,732 30,775,893 100,694,650 191,744,924 (710,311,225 ) 1,531,933,657 Plant, property and equipment, net 54,589,459 106,869,482 174,761,167 60,537,650 50,133,642 39,068,450 38,934,747 1,405,755 38,223,641 75,707,738 (888,361 ) 639,343,370 Goodwill 27,396,393 215,381 25,379,805 5,241,305 12,124,685 4,895,331 7,289,748 3,220,105 14,186,723 52,950,325 — 152,899,801 Trademarks, net 46,476 212,324 37,207 — — — — 369,950 227,156 2,595,596 — 3,488,709 Licenses and rights, net 11,087,882 452,504 29,324,718 12,103,980 5,530,422 8,064,487 4,390,547 — 7,942,670 25,951,335 — 104,848,545 Investment in associated companies 3,562,323 610,807 111,073 (7,806 ) 391 — 25,603 — — — (1,828,198 ) 2,474,193 Liabilities by segments 718,354,229 175,774,964 297,877,328 103,330,525 55,576,253 55,463,339 37,993,180 31,557,816 54,276,868 124,319,541 (349,497,251 ) 1,305,026,792 Mexico Telmex Brazil Southern Cone Colombia Andean Central America U.S.A. Caribbean Europe Eliminations Consolidated total As of and for the year ended December 31, 2020 (in Ps.): External revenues 214,578,601 77,920,910 163,865,421 55,484,744 77,282,658 53,846,358 48,073,436 177,179,369 37,182,842 111,472,191 — 1,016,886,530 Intersegment revenues 17,663,525 13,668,264 4,207,466 1,220,100 352,694 88,305 121,580 — 1,440,983 — (38,762,917 ) — Total revenues 232,242,126 91,589,174 168,072,887 56,704,844 77,635,352 53,934,663 48,195,016 177,179,369 38,623,825 111,472,191 (38,762,917 ) 1,016,886,530 Depreciation and amortization 24,748,756 13,341,479 41,795,397 13,095,004 14,413,760 11,447,356 14,355,899 1,561,284 7,094,331 25,593,204 (3,202,787 ) 164,243,683 Operating income (loss) 70,851,525 11,204,433 25,203,504 1,877,079 15,111,947 8,698,645 4,004,501 10,579,394 6,701,086 13,159,865 (2,037,068 ) 165,354,911 Interest income 21,322,406 1,479,021 2,904,430 980,581 822,447 1,049,261 1,130,767 77,235 1,105,420 90,746 (25,900,278 ) 5,062,036 Interest expense 30,936,195 1,306,867 17,976,227 3,334,966 2,586,708 2,223,478 1,559,917 255 1,658,619 2,546,255 (25,467,747 ) 38,661,740 Income tax 4,905,863 577,178 (4,442,598 ) 992,831 2,078,789 3,115,693 1,518,953 2,856,881 2,524,214 2,234,065 4,283 16,366,152 Equity interest in net income (loss) of associated companies (3,820 ) 23,955 (2,972 ) (15,422 ) — — — — — (288,747 ) — (287,006 ) Net profit (loss) attributable to equity holders of the parent 3,613,907 (1,085,038 ) 4,963,424 1,456,062 16,579,303 4,649,047 1,919,558 7,797,723 3,294,111 7,777,426 (4,112,918 ) 46,852,605 Assets by segment 947,396,510 203,081,314 386,982,711 118,266,380 132,210,369 101,717,708 88,690,683 35,083,285 109,914,293 239,583,759 (737,878,785 ) 1,625,048,227 Plant, property and equipment, net 52,117,395 110,751,083 145,307,497 62,157,797 48,876,853 36,102,261 37,855,227 1,761,595 39,128,447 82,595,077 (876,229 ) 615,777,003 Revalued of assets — — 36,076,207 7,494,408 12,893,284 9,500,708 7,059,247 — 2,572,504 31,556,270 — 107,152,628 Goodwill 26,949,185 215,381 16,048,092 5,436,675 12,253,743 4,866,363 6,345,659 3,362,899 14,186,723 53,388,139 — 143,052,859 Trademarks, net 126,823 181,094 — — — — — 269,325 219,087 2,981,089 — 3,777,418 Licenses and rights, net 12,017,318 100,623 26,171,345 12,099,873 12,363,039 6,870,531 5,427,857 — 8,616,880 27,963,250 — 111,630,716 Investment in associated companies 51,645 613,449 64,125 (20,970 ) 395 — 25,413 — — — 1,095,703 1,829,760 Liabilities by segments 725,408,198 193,840,756 263,989,566 61,786,265 63,610,642 53,379,366 34,252,511 33,141,315 60,839,340 138,747,621 (319,064,971 ) 1,309,930,609

Description of the Business a_2

Description of the Business and Relevant Events - Additional Information (Detail) $ in Thousands, $ in Millions	1 Months Ended	12 Months Ended
	Sep. 30, 2020USD ($)	Dec. 31, 2020MXN ($)Country
Disclosure Of Corporate Information [line items]
Corporate information description		América Móvil, S.A.B. de C.V. and subsidiaries (hereinafter, the “Company”, “América Móvil” or “AMX”) was incorporated under laws of Mexico on September 25, 2000. The Company provides telecommunications services in 25 countries throughout Latin America, the United States, the Caribbean and Europe. These telecommunications services include mobile and fixed-line voice services, wireless and fixed data services, internet access and Pay TV, over the top and other related services. The Company also sells equipment, accessories and computers.
Number of countries in which company operates | Country		25
Number of countries in which company holds license | Country		24
Percentage of voting equity interests acquired		80.00%
Verizon Communications Inc [Member] | Twenty Twenty Business Acquisition [Member]
Disclosure Of Corporate Information [line items]
Consideration transferred, acquisition-date fair value	$ 6,250
Percentage of voting equity interests acquired	100.00%
Number Of Subscribers	$ 21
Consideration payable	500
Deferred Commercial Consideration Payable	$ 150
Currency risk [member]
Disclosure Of Corporate Information [line items]
Percentage of fell in value of Mexican Peso Over foreign currency		5.00%
Currency risk [member] | Covid 19 [Member]
Disclosure Of Corporate Information [line items]
Foreign currency exchange loss		$ 65,366,200
Currency risk [member] | U.S. dollars [member] | Covid 19 [Member]
Disclosure Of Corporate Information [line items]
Percentage of fell in value of Mexican Peso Over foreign currency		5.80%
Currency risk [member] | Euros [member] | Covid 19 [Member]
Disclosure Of Corporate Information [line items]
Percentage of fell in value of Mexican Peso Over foreign currency		15.30%
Currency risk [member] | Great Britain Pound (GBP) [member] | Covid 19 [Member]
Disclosure Of Corporate Information [line items]
Percentage of fell in value of Mexican Peso Over foreign currency		9.20%

Basis of Preparation of the C_4

Basis of Preparation of the Consolidated Financial Statements and Summary of Significant Accounting Policies and Practices - Additional Information (Detail) $ in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)	Apr. 26, 2021	Dec. 31, 2020USD ($)
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]
Cumulative index	385.8826
Percentage of annual basis index	36.10%
Closing exchange rate	0.2371	0.3147		0.4	0.2371
Cumulative translation (loss) gain	$ (160,580,917)	$ (199,878,430)			$ (8,049)
Impairment losses on goodwill	0	0	$ 0
Borrowing costs capitalised	1,771,613	2,233,358	2,020,288
Impairment losses	0	0	0
Impairment losses on intangibles	$ 0	0	0
Description of estimation of impairment cash-generating unit	In the estimation of impairments, the Company uses the strategic plans established for the separate cash-generating units to which the assets are assigned. Such strategic plans generally cover a period from 3 to 5 years. For longer periods, beginning in the fifth year, projections are based on such strategic plans while applying a constant or declining expected perpetual growth rate.
Percentage of sensitivity analysis for increase in capital expenditures	5.00%
Adjustments of sensitivity analysis long-life assets	$ 62,548
Increase in weighted average cost of capital basis	0.50%
Monthly contributions to pension fund	17.50%
Percentage of employee profit sharing based on individual company taxable income	10.00%
Advertising expenses	$ 19,894,607	22,810,211	$ 26,255,952
Increase (decrease) in interest expense	$ 628,382,956	$ 624,254,477
Concentration risk percentage	10.00%				10.00%
Currency depreciation rate				0.40%
Property, plant and equipment, revalued assets, at cost	$ 107,152,628
Foreign subsidiaries [member]
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]
Consolidated operating revenues	72.00%	71.00%	73.00%
Percentage of operating revenue as percentage of total assets	75.00%	73.00%
Interest rate risk [member]
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]
Increase in basis points	1.00%
Increase in net interest expense	$ (13,417,231)
Increase (decrease) in interest expense	$ 1,476,660
Currency risk [member]
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]
Fluctuation in exchange rates	5.00%				5.00%
Increase (decrease) in interest expense	$ 628,382,956
Increase (decrease) through changes in foreign exchange rates, regulatory deferral account credit balances	31,429,089
Increase (decrease) through changes in discount rates, regulatory deferral account credit balances	$ (31,429,089)
Increase/(decrease) in exchange rates	5.00%
Argentina [member]
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]
Closing exchange rate	0.2371	0.3147			0.2371
Argentina [member] | Impact of application of hyperinflation adjustments in 2018 [member]
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]
Cumulative inflation percentage			100.00%
U.S.A. [member]
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]
Closing exchange rate	19.9487	18.8452			19.9487
Cumulative translation adjustment [member]
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]
Cumulative translation (loss) gain	$ (100,926,140)	$ (87,367,366)
Licenses and rights of use [member]
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]
Intangibles useful life	Licenses are amortized when the Company does not have a basis to conclude that they are indefinite lived. Licenses are amortized using the straight-line method over a period ranging from 3 to 30 years, which represents the usage period of the assets.
Licenses and rights of use [member] | Bottom of range [member]
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]
Estimated useful lives	3 years
Licenses and rights of use [member] | Top of range [member]
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]
Estimated useful lives	30 years
Trademarks [member] | Bottom of range [member]
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]
Estimated useful lives	1 year
Trademarks [member] | Top of range [member]
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]
Estimated useful lives	10 years
Customer relationships [member]
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]
Intangibles useful life	amortized over a 5-year period.
Estimated useful lives	5 years

Basis of Preparation of the C_5

Basis of Preparation of the Consolidated Financial Statements and Summary of Significant Accounting Policies and Practices - Summary of Equity Interest in Most Significant Subsidiaries (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Netherlands [member] | America Movil B. V. [member]
Disclosure of subsidiaries [line items]
Percentage of equity interest	100.00%	100.00%
Mexico [member] | Sercotel, S.A. de C.V. [member]
Disclosure of subsidiaries [line items]
Percentage of equity interest	100.00%	100.00%
Mexico [member] | Radiomovil Dipsa, S.A. de C.V. and subsidiaries (Telcel) [member]
Disclosure of subsidiaries [line items]
Percentage of equity interest	100.00%	100.00%
Mexico [member] | Claro Panama, S.A. [member]
Disclosure of subsidiaries [line items]
Percentage of equity interest	100.00%	100.00%
Mexico [member] | Telefonos De Mexico S.A.B. de C.V [member]
Disclosure of subsidiaries [line items]
Percentage of equity interest	98.80%	98.80%
Dominican Republic [member] | Compania Dominicana De Telefonos S.A. (Codetel) [member]
Disclosure of subsidiaries [line items]
Percentage of equity interest	100.00%	100.00%
Puerto Rico [member] | Puerto Rico Telephone Company Inc [member]
Disclosure of subsidiaries [line items]
Percentage of equity interest	100.00%	100.00%
Honduras [member] | Servicios de Comunicaciones de Honduras, S.A. de C.V.(Sercom Honduras) [member]
Disclosure of subsidiaries [line items]
Percentage of equity interest	100.00%	100.00%
U.S.A. [member] | TracFone Wireless, Inc. (TracFone) [member]
Disclosure of subsidiaries [line items]
Percentage of equity interest	100.00%	100.00%
Brazil [member] | Claro S.A. (Claro Brasil) [member]
Disclosure of subsidiaries [line items]
Percentage of equity interest	98.20%	98.20%
Brazil [member] | Nextel Telecomunicaes Ltda [member]
Disclosure of subsidiaries [line items]
Percentage of equity interest	100.00%	100.00%
Guatemala [member] | Telecomunicaciones de Guatemala, S.A. (Telgua) [member]
Disclosure of subsidiaries [line items]
Percentage of equity interest	99.30%	99.30%
Guatemala [member] | Claro Guatemala S.A [member]
Disclosure of subsidiaries [line items]
Percentage of equity interest		100.00%
Nicaragua [member] | Empresa Nicaraguense de Telecomunicaciones, S.A. (Enitel) [member]
Disclosure of subsidiaries [line items]
Percentage of equity interest	99.60%	99.60%
El Salvador [member] | Compania de Telecomunicaciones de El Salvador, S.A. de C.V. (CTE) [member]
Disclosure of subsidiaries [line items]
Percentage of equity interest	95.80%	95.80%
Colombia [member] | Comunicacion Celular S. A. (Comcel) [member]
Disclosure of subsidiaries [line items]
Percentage of equity interest	99.40%	99.40%
Ecuador [member] | Consorcio Ecuatoriano de Telecomunicaciones, S.A. (Conecel) [member]
Disclosure of subsidiaries [line items]
Percentage of equity interest	100.00%	100.00%
Argentina [member] | AMX Argentina, S.A. [member]
Disclosure of subsidiaries [line items]
Percentage of equity interest	100.00%	100.00%
Paraguay [member] | AMX Paraguay, S.A. [member]
Disclosure of subsidiaries [line items]
Percentage of equity interest	100.00%	100.00%
Uruguay [member] | AM Wireless Uruguay, S.A.[member]
Disclosure of subsidiaries [line items]
Percentage of equity interest	100.00%	100.00%
Chile [member] | Claro Chile S A [member]
Disclosure of subsidiaries [line items]
Percentage of equity interest	100.00%	100.00%
Peru [member] | America Movil Peru S.A. C. [member]
Disclosure of subsidiaries [line items]
Percentage of equity interest	100.00%	100.00%
Austria [member] | Telekom Austria AG [member]
Disclosure of subsidiaries [line items]
Percentage of equity interest	51.00%	51.00%
Luxembourg [member] | NII Brazil Holding SARL [member]
Disclosure of subsidiaries [line items]
Percentage of equity interest	100.00%	100.00%
GT [Member] | Claro Guatemala S.A [member]
Disclosure of subsidiaries [line items]
Percentage of equity interest	100.00%

Basis of Preparation of the C_6

Basis of Preparation of the Consolidated Financial Statements and Summary of Significant Accounting Policies and Practices - Summary of Annual Depreciation Rates (Detail)	12 Months Ended
	Dec. 31, 2020
Bottom of range [member] | Network infrastructure [member]
Disclosure of detailed information about property, plant and equipment [line items]
Annual depreciation rates	5.00%
Bottom of range [member] | Buildings and leasehold improvements [member]
Disclosure of detailed information about property, plant and equipment [line items]
Annual depreciation rates	2.00%
Bottom of range [member] | Other assets [member]
Disclosure of detailed information about property, plant and equipment [line items]
Annual depreciation rates	10.00%
Top of range [member] | Network infrastructure [member]
Disclosure of detailed information about property, plant and equipment [line items]
Annual depreciation rates	33.00%
Top of range [member] | Buildings and leasehold improvements [member]
Disclosure of detailed information about property, plant and equipment [line items]
Annual depreciation rates	33.00%
Top of range [member] | Other assets [member]
Disclosure of detailed information about property, plant and equipment [line items]
Annual depreciation rates	50.00%

Basis of Preparation of the C_7

Basis of Preparation of the Consolidated Financial Statements and Summary of Significant Accounting Policies and Practices - Schedule of Estimate Impairment Evaluations (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Brazil [member]
Disclosure of impairment of assets [line items]
Average margin on EBIDTA	40.67%	40.43%
Average margin on CAPEX	25.36%	23.50%
Average pre-tax discount rate (WACC)	9.50%	11.00%
Puerto Rico [member]
Disclosure of impairment of assets [line items]
Average margin on EBIDTA	23.06%	21.94%
Average margin on CAPEX	14.57%	17.94%
Average pre-tax discount rate (WACC)	3.53%	4.39%
Dominican Republic [member]
Disclosure of impairment of assets [line items]
Average margin on EBIDTA	47.57%	47.23%
Average margin on CAPEX	13.71%	16.17%
Average pre-tax discount rate (WACC)	8.27%	13.84%
Mexico [member]
Disclosure of impairment of assets [line items]
Average margin on EBIDTA	32.69%	38.81%
Average margin on CAPEX	11.01%	9.84%
Average pre-tax discount rate (WACC)	6.03%	6.94%
Ecuador [member]
Disclosure of impairment of assets [line items]
Average margin on EBIDTA	49.23%	44.98%
Average margin on CAPEX	11.14%	11.65%
Average pre-tax discount rate (WACC)	17.50%	19.85%
Peru [member]
Disclosure of impairment of assets [line items]
Average margin on EBIDTA	38.72%	32.51%
Average margin on CAPEX	15.43%	18.51%
Average pre-tax discount rate (WACC)	4.76%	8.86%
El Salvador [member]
Disclosure of impairment of assets [line items]
Average margin on EBIDTA	45.92%	44.04%
Average margin on CAPEX	21.19%	25.03%
Average pre-tax discount rate (WACC)	14.63%	16.05%
Chile [member]
Disclosure of impairment of assets [line items]
Average margin on EBIDTA	26.34%	26.85%
Average margin on CAPEX	13.18%	18.00%
Average pre-tax discount rate (WACC)	3.37%	4.16%
Colombia [member]
Disclosure of impairment of assets [line items]
Average margin on EBIDTA	43.45%	45.58%
Average margin on CAPEX	18.19%	19.25%
Average pre-tax discount rate (WACC)	6.44%	17.27%
Bottom of range [member] | Europe [member]
Disclosure of impairment of assets [line items]
Average margin on EBIDTA	32.20%	29.40%
Average margin on CAPEX	7.04%	10.90%
Average pre-tax discount rate (WACC)	3.88%	5.77%
Bottom of range [member] | Other countries [member]
Disclosure of impairment of assets [line items]
Average margin on EBIDTA	10.07%	7.40%
Average margin on CAPEX	0.48%	0.57%
Average pre-tax discount rate (WACC)	3.42%	6.41%
Top of range [member] | Europe [member]
Disclosure of impairment of assets [line items]
Average margin on EBIDTA	40.76%	44.50%
Average margin on CAPEX	19.39%	19.30%
Average pre-tax discount rate (WACC)	12.02%	14.96%
Top of range [member] | Other countries [member]
Disclosure of impairment of assets [line items]
Average margin on EBIDTA	47.23%	52.40%
Average margin on CAPEX	31.67%	31.00%
Average pre-tax discount rate (WACC)	21.85%	34.75%

Basis of Preparation of the C_8

Basis of Preparation of the Consolidated Financial Statements and Summary of Significant Accounting Policies and Practices - Summary of Exchange Rates Used for Translation of Foreign Currencies (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Apr. 26, 2021
Disclosure of transactions in foreign currency [line items]
Closing exchange rate	0.2371	0.3147		0.4
Argentina [member]
Disclosure of transactions in foreign currency [line items]
Average exchange rate	0.3070	0.4110	0.7311
Closing exchange rate	0.2371	0.3147
Brazil [member]
Disclosure of transactions in foreign currency [line items]
Average exchange rate	4.1850	4.8907	5.2937
Closing exchange rate	3.8387	4.6754
Colombia [member]
Disclosure of transactions in foreign currency [line items]
Average exchange rate	0.0058	0.0059	0.0065
Closing exchange rate	0.0058	0.0058
Guatemala [member]
Disclosure of transactions in foreign currency [line items]
Average exchange rate	2.7826	2.5023	2.5591
Closing exchange rate	2.5596	2.4478
U.S.A. [member]
Disclosure of transactions in foreign currency [line items]
Average exchange rate	21.4860	19.2641	19.2397
Closing exchange rate	19.9487	18.8452
Uruguay [member]
Disclosure of transactions in foreign currency [line items]
Average exchange rate	0.5110	0.5479	0.6274
Closing exchange rate	0.4712	0.5051
Nicaragua [member]
Disclosure of transactions in foreign currency [line items]
Average exchange rate	0.6257	0.5817	0.6097
Closing exchange rate	0.5728	0.5569
Honduras [member]
Disclosure of transactions in foreign currency [line items]
Average exchange rate	0.8678	0.7806	0.7994
Closing exchange rate	0.8215	0.7597
Chile [member]
Disclosure of transactions in foreign currency [line items]
Average exchange rate	0.0271	0.0275	0.0300
Closing exchange rate	0.0281	0.0252
Paraguay [member]
Disclosure of transactions in foreign currency [line items]
Average exchange rate	0.0032	0.0031	0.0034
Closing exchange rate	0.0029	0.0029
Peru [member]
Disclosure of transactions in foreign currency [line items]
Average exchange rate	6.1483	5.7708	5.8517
Closing exchange rate	5.5046	5.6814
Dominican Republic [member]
Disclosure of transactions in foreign currency [line items]
Average exchange rate	0.3766	0.3737	0.3876
Closing exchange rate	0.3416	0.3542
Costa Rica [member]
Disclosure of transactions in foreign currency [line items]
Average exchange rate	0.0366	0.0326	0.0332
Closing exchange rate	0.0323	0.0327
European Union [member]
Disclosure of transactions in foreign currency [line items]
Average exchange rate	24.5080	21.5642	22.7101
Closing exchange rate	24.3693	21.1311
Bulgaria [member]
Disclosure of transactions in foreign currency [line items]
Average exchange rate	12.5284	11.0257	11.6110
Closing exchange rate	12.4594	10.8076
Belarus [member]
Disclosure of transactions in foreign currency [line items]
Average exchange rate	8.8172	9.2159	9.4451
Closing exchange rate	7.5721	8.9420
Croatia [member]
Disclosure of transactions in foreign currency [line items]
Average exchange rate	3.2498	2.9069	3.0613
Closing exchange rate	3.2279	2.8406
Macedonia [member]
Disclosure of transactions in foreign currency [line items]
Average exchange rate	0.3975	0.3504	0.3688
Closing exchange rate	0.3950	0.3431
Serbia [member]
Disclosure of transactions in foreign currency [line items]
Average exchange rate	0.2083	0.1830	0.1920
Closing exchange rate	0.2071	0.1795

Basis of Preparation of the C_9

Basis of Preparation of the Consolidated Financial Statements and Summary of Significant Accounting Policies and Practices - Summary of Right-of-use assets are depreciated on a straight-line basis (Detail) - Property, plant and equipment subject to operating leases [member]	12 Months Ended
	Dec. 31, 2020
Towers and sites [member] | Bottom of range [member]
Disclosure of quantitative information about right-of-use assets [line items]
Useful life measured as period of time property, plant and equipment	5 years
Towers and sites [member] | Top of range [member]
Disclosure of quantitative information about right-of-use assets [line items]
Useful life measured as period of time property, plant and equipment	12 years
Property [member] | Bottom of range [member]
Disclosure of quantitative information about right-of-use assets [line items]
Useful life measured as period of time property, plant and equipment	10 years
Property [member] | Top of range [member]
Disclosure of quantitative information about right-of-use assets [line items]
Useful life measured as period of time property, plant and equipment	25 years
Other equipment [member] | Bottom of range [member]
Disclosure of quantitative information about right-of-use assets [line items]
Useful life measured as period of time property, plant and equipment	5 years
Other equipment [member] | Top of range [member]
Disclosure of quantitative information about right-of-use assets [line items]
Useful life measured as period of time property, plant and equipment	15 years

Equity Investments at Fair Va_2

Equity Investments at Fair Value Through OCI and Other Short-term Investments - Additional Information (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of equity investments at fair value through other comprehensive income and other short-term investments [line items]
Dividends received	$ 2,122,826	$ 1,773,336	$ 2,605,333
Investments accounted for using equity method Koninklijke KPN [member]
Disclosure of equity investments at fair value through other comprehensive income and other short-term investments [line items]
Other short-term investments	4,603,284	10,145,615
Changes in fair value of investment	(1,952,414)	883,408
Dividends received	2,119,668	1,742,242	$ 2,605,333
Equity and other short term investments [member] | Investments accounted for using equity method Koninklijke KPN [member]
Disclosure of equity investments at fair value through other comprehensive income and other short-term investments [line items]
Equity investments at fair value through OCI	$ 50,033,111	$ 37,572,410

Accounts Receivable from Subs_3

Accounts Receivable from Subscribers, Distributors, Recoverable Taxes Contractual Assets and Other, Net - Summary of Analysis of Accounts Receivable by Component (Detail) $ in Thousands, $ in Millions	Dec. 31, 2020MXN ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019MXN ($)
Disclosure of accounts receivable [line items]
Contract assets	$ 29,588,104		$ 34,274,007
Impairment of trade receivables	(44,551,735)		(39,480,909)
Trade and other receivables	215,770,817		219,845,738
Non-current subscribers, distributors and contractual assets	7,792,863	$ 391	15,139,442
Total current subscribers, distributors and contractual assets	207,977,954	$ 10,426	204,706,296
Cost [member] | Receivable from subscribers and distributors [member]
Disclosure of accounts receivable [line items]
Trade and other receivables	168,758,386		184,260,099
Cost [member] | Telecommunications carriers for network interconnection and other services [member]
Disclosure of accounts receivable [line items]
Trade and other receivables	4,914,094		5,079,763
Cost [member] | Recoverable taxes [member]
Disclosure of accounts receivable [line items]
Trade and other receivables	44,557,402		23,628,728
Cost [member] | Sundry debtors [member]
Disclosure of accounts receivable [line items]
Trade and other receivables	$ 12,504,566		$ 12,084,050

Accounts Receivable from Subs_4

Accounts Receivable from Subscribers, Distributors, Recoverable Taxes Contractual Assets and Other, Net - Schedule of Changes in Allowance for Expected Credit Losses (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Subclassifications of assets, liabilities and equities [abstract]
Balance at beginning of year	$ (39,480,909)	$ (40,798,025)	$ (39,044,925)
Increases recorded in expenses	(19,112,635)	(16,346,395)	(19,535,707)
Adjustment on initial application of IFRS 9			(2,400,783)
Write-offs	11,953,227	17,839,957	15,497,254
Business combination	(2,066)	(3,265,490)
Translation effect	2,090,648	3,089,044	4,686,136
Balance at end of year	$ (44,551,735)	$ (39,480,909)	$ (40,798,025)

Accounts Receivable from Subs_5

Accounts Receivable from Subscribers, Distributors, Recoverable Taxes Contractual Assets and Other, Net - Summary of Aging of Accounts Receivable (Detail) - MXN ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Disclosure of accounts receivable [line items]
Trade and other receivables	$ 215,770,817	$ 219,845,738
Receivable from subscribers and distributors [member] | Cost [member]
Disclosure of accounts receivable [line items]
Trade and other receivables	168,758,386	184,260,099
Receivable from subscribers and distributors [member] | 1 - 30 days [member] | Cost [member]
Disclosure of accounts receivable [line items]
Trade and other receivables	37,439,995	46,083,644
Receivable from subscribers and distributors [member] | 31 - 60 days [member] | Cost [member]
Disclosure of accounts receivable [line items]
Trade and other receivables	5,325,264	6,076,281
Receivable from subscribers and distributors [member] | 61 - 90 days [member] | Cost [member]
Disclosure of accounts receivable [line items]
Trade and other receivables	3,313,835	4,121,929
Receivable from subscribers and distributors [member] | Greater than 90 days [member] | Cost [member]
Disclosure of accounts receivable [line items]
Trade and other receivables	46,706,481	51,755,002
Unbilled services provided [member] | Receivable from subscribers and distributors [member] | Cost [member]
Disclosure of accounts receivable [line items]
Trade and other receivables	$ 75,972,811	$ 76,223,243

Accounts Receivable from Subs_6

Accounts Receivable from Subscribers, Distributors, Recoverable Taxes Contractual Assets and Other, Net - Summary of Accounts Receivable From Subscribers and Distributors Included in Impairments of Trade Receivables (Detail) - Receivable from subscribers and distributors [member] - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of accounts receivable [line items]
Allowance for bad debts	$ 44,551,735	$ 39,480,909
1 - 90 days [member]
Disclosure of accounts receivable [line items]
Allowance for bad debts	4,455,174	3,948,091
Greater than 90 days [member]
Disclosure of accounts receivable [line items]
Allowance for bad debts	$ 40,096,561	$ 35,532,818

Accounts Receivable from Subs_7

Accounts Receivable from Subscribers, Distributors, Recoverable Taxes Contractual Assets and Other, Net - Summary of Analysis of Contract Assets and Liabilities (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Contract Assets:
Beginning balance	$ 34,274,007	$ 34,718,749
Additions	27,242,031	34,877,851
Disposals	(1,397,714)	(2,658,641)
Business Combination		576,463
Amortization	(29,002,995)	(30,501,315)
Translation effect	(1,527,225)	(2,739,100)
Ending balance	29,588,104	34,274,007
Non-current contract assets	817,740	1,786,560
Current portion contracts assets	$ 28,770,364	$ 32,487,447

Related Parties - Summary of An

Related Parties - Summary of Analysis of the Balances with Related Parties (Detail) - MXN ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Disclosure of receivables and payables arising from related party transactions [line items]
Amounts receivable from related party transactions	$ 1,391,300	$ 1,273,140
Amounts payable to related party transactions	3,999,916	3,460,419
Hubard y Bourlon SA de CV [member]
Disclosure of receivables and payables arising from related party transactions [line items]
Amounts receivable from related party transactions	437,231	172,952
Patrimonial Inbursa, SA [member]
Disclosure of receivables and payables arising from related party transactions [line items]
Amounts receivable from related party transactions	327,985	386,194
Sears Roebuck de México, S.A. de C.V. and Subsidiaries [member]
Disclosure of receivables and payables arising from related party transactions [line items]
Amounts receivable from related party transactions	233,402	228,523
Sanborns Hermanos, SA [member]
Disclosure of receivables and payables arising from related party transactions [line items]
Amounts receivable from related party transactions	160,116	229,964
Claroshopcom SAPI de CV [member]
Disclosure of receivables and payables arising from related party transactions [line items]
Amounts receivable from related party transactions	100,075	91,874
Carso Infraestructura y Construccion, SA de CV and Subsidiaries [member]
Disclosure of receivables and payables arising from related party transactions [line items]
Amounts receivable from related party transactions	7,679	41,204
Amounts payable to related party transactions	2,192,405	1,656,123
Grupo Condumex, SA de CV and Subsidiaries [member]
Disclosure of receivables and payables arising from related party transactions [line items]
Amounts receivable from related party transactions	10,038	12,018
Amounts payable to related party transactions	1,054,526	905,776
Fianzas Guardiana Inbursa, SA de CV [member]
Disclosure of receivables and payables arising from related party transactions [line items]
Amounts payable to related party transactions	241,898	241,305
Grupo Financiero Inbursa, SAB de CV [member]
Disclosure of receivables and payables arising from related party transactions [line items]
Amounts payable to related party transactions	234,954	246,804
Seguros Inbursa SA de CV [member]
Disclosure of receivables and payables arising from related party transactions [line items]
Amounts payable to related party transactions	92,173	100,155
PC Industrial, SA de CV and Subsidiaries [member]
Disclosure of receivables and payables arising from related party transactions [line items]
Amounts payable to related party transactions	44,198	68,189
Enesa, SA de CV and Subsidiaries [member]
Disclosure of receivables and payables arising from related party transactions [line items]
Amounts payable to related party transactions	22,014	25,076
Other related parties [member]
Disclosure of receivables and payables arising from related party transactions [line items]
Amounts receivable from related party transactions	114,774	110,411
Amounts payable to related party transactions	$ 117,748	$ 216,991

Related Parties - Additional In

Related Parties - Additional Information (Detail) - MXN ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of transactions between related parties [line items]
Impairment of receivables in connection with amounts owed by related parties	$ 0	$ 0	$ 0
Members of the audit and corporate practices committee [member]
Disclosure of transactions between related parties [line items]
compensation paid	6,300,000
Directors and other key management personnel [member]
Disclosure of transactions between related parties [line items]
compensation paid	$ 79,600,000

Related Parties - Summary of Tr

Related Parties - Summary of Transactions with Related Parties (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of transactions between related parties [abstract]
Construction services, purchases of materials, inventories and property, plant and equipment	$ 7,130,769	$ 8,573,894	$ 7,211,960
Insurance premiums, fees paid for administrative and operating services, brokerage services and others	4,375,113	4,590,620	4,134,380
Rent of towers			6,168,592
Other services	1,101,528	1,277,404	1,864,017
Investments and expenses	12,607,410	14,441,918	19,378,949
Service revenues	608,248	538,110	679,220
Sales of equipment	656,801	944,697	1,296,204
Revenues	$ 1,265,049	$ 1,482,807	$ 1,975,424

Related Parties - Summary of _2

Related Parties - Summary of Transactions with Related Parties (Parenthetical) (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of transactions between related parties [line items]
Materials purchased from subsidiaries	$ 5,312,845	$ 6,809,244	$ 5,622,791
Grupo Carso, SAB de CV [member]
Disclosure of transactions between related parties [line items]
Network maintenance service cost	203,013	956,132	778,191
Associates [member]
Disclosure of transactions between related parties [line items]
Software service expense	13,490	16,161	13,784
Seguros Inbursa SA and Fianzas Guardiana Inbursa, SA [member]
Disclosure of transactions between related parties [line items]
Insurance premium	$ 2,713,370	$ 2,623,795	$ 2,541,703

Derivative Financial Instrume_3

Derivative Financial Instruments - Additional Information (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]
Changes in fair value of derivative financial instruments gain (loss)	$ 12,378,193	$ 4,432,023	$ (4,686,407)
Derivatives [member] | Debt securities [member]
Disclosure of detailed information about financial instruments [line items]
Weighted-average interest rate	3.50%	(3.80%)	4.10%

Derivative Financial Instrume_4

Derivative Financial Instruments - Schedule of Derivative Financial Instruments Contracted (Detail) $ in Thousands, € in Millions, ¥ in Millions, £ in Millions, R$ in Millions, $ in Millions, $ in Millions	Dec. 31, 2020MXN ($)	Dec. 31, 2020USD ($)	Dec. 31, 2020EUR (€)	Dec. 31, 2020BRL (R$)	Dec. 31, 2020GBP (£)	Dec. 31, 2020JPY (¥)	Dec. 31, 2019MXN ($)	Dec. 31, 2019USD ($)	Dec. 31, 2019EUR (€)	Dec. 31, 2019BRL (R$)	Dec. 31, 2019GBP (£)	Dec. 31, 2019JPY (¥)	Dec. 31, 2019ARS ($)	Dec. 31, 2018GBP (£)
Disclosure of detailed information about financial instruments [line items]
Fair value, Asset	$ 20,928,335	$ 1,049					$ 6,825,760
Fair value, Liabilities	(14,230,249)						(9,596,751)
Swaps US Dollar-Mexican peso [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Asset		3,490						$ 3,290
Fair value, Asset	16,806,937						4,420,433
Notional amount, Liabilities								200
Fair value, Liabilities							(33,253)
Swaps Yen-US Dollar [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Asset | ¥						¥ 9,750						¥ 6,500
Fair value, Asset	269,215						262,993
Notional amount, Liabilities | ¥						¥ 3,250
Fair value, Liabilities	(14,802)
Forwards US Dollar-Mexican peso [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Asset		240						100
Fair value, Asset	39,607						18
Notional amount, Liabilities		3,494						2,343
Fair value, Liabilities	(4,052,852)						(1,398,247)
Forwards US Dollar - Brazilian real [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Asset								83
Fair value, Asset							90,429
Forwards Brazilian Real - US Dollar [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Asset | R$				R$ 4193						R$ 5803
Fair value, Asset	1,190,292						1,620,605
Notional amount, Liabilities | R$				R$ 1762
Fair value, Liabilities	(425,249)
Forwards Euro- Brazilian real [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Asset | €									€ 50
Fair value, Asset							4,255
Notional amount, Liabilities | €									140
Fair value, Liabilities							(10,196)
Forwards Euro-US Dollar [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Asset | €			€ 915						1,506
Fair value, Asset	266,639						204,241
Notional amount, Liabilities | €									1,094
Fair value, Liabilities							(554,278)
Swaps Dollar- Euro [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Liabilities		800						800
Fair value, Liabilities	(4,811,031)						(2,228,287)
Swaps Pound sterling-Euro [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Liabilities | £					£ 640						£ 640
Fair value, Liabilities	(3,122,492)						(2,201,997)
Swap Pound sterling-USDollar [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Asset | £											£ 100
Notional amount, Liabilities | £					550									£ 2,010
Fair value, Liabilities	(457,559)						(3,019,255)
Put option [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Liabilities | €			374						374
Fair value, Liabilities	(1,073,990)						(126,569)
Call option [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Liabilities | €									€ 3,000
Fair value, Liabilities							(2,113)
Swaps US Dollar- Euro [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Asset		$ 150						150
Fair value, Asset	117,726						96,967
Swaps Pound sterling – US Dollar [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Asset | £					£ 1,010
Fair value, Asset	2,237,919						2,988
Forwards Argentinean Peso – US Dollar [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Asset													$ 1,388
Fair value, Asset							122,831
Forwards US Dollar - Euro [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Liabilities								$ 20
Fair value, Liabilities							(3,787)
Forwards Yen - US Dollar [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Liabilities | ¥												¥ 6,500
Fair value, Liabilities							$ (18,769)
Forwards Euro - Mexican Peso [Member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Liabilities | €			€ 200
Fair value, Liabilities	$ (272,274)

Derivative Financial Instrume_5

Derivative Financial Instruments - Summary of Maturities of Notional Amount of Derivatives (Detail) € in Millions, ¥ in Millions, ¥ in Millions, £ in Millions, R$ in Millions, $ in Millions	Dec. 31, 2020USD ($)	Dec. 31, 2020EUR (€)	Dec. 31, 2020BRL (R$)	Dec. 31, 2020CNY (¥)	Dec. 31, 2020GBP (£)	Dec. 31, 2020JPY (¥)	Dec. 31, 2019USD ($)	Dec. 31, 2019EUR (€)	Dec. 31, 2019BRL (R$)	Dec. 31, 2019GBP (£)	Dec. 31, 2019JPY (¥)
Swaps US Dollar-Mexican peso [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Asset	$ 3,490						$ 3,290
Notional amount, Liabilities							200
Swaps Yen-US Dollar [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Asset | ¥						¥ 9,750					¥ 6,500
Notional amount, Liabilities | ¥						3,250
Forwards Brazilian Real - US Dollar [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Asset | R$			R$ 4193						R$ 5803
Notional amount, Liabilities | R$			1,762
Forwards Euro-US Dollar [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Asset | €		€ 915						€ 1,506
Notional amount, Liabilities | €								1,094
Swaps Dollar- Euro [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Liabilities	800						800
Swaps Pound sterling-Euro [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Liabilities | £					£ 640					£ 640
Forwards US Dollar-Mexican peso [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Asset	240						100
Notional amount, Liabilities	3,494						2,343
Put option [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Liabilities | €		374						€ 374
Swaps US Dollar- Euro [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Asset	150						$ 150
Swaps Pound sterling – US Dollar [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Asset | £					1,010
Forwards Euro - Mexican Peso [Member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Liabilities | €		200
2021 [member] | Forwards Brazilian Real - US Dollar [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Asset | R$			4,193
Notional amount, Liabilities | R$			R$ 1762
2021 [member] | Forwards Euro-US Dollar [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Asset | €		915
2021 [member] | Forwards US Dollar-Mexican peso [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Asset	240
Notional amount, Liabilities	3,494
2021 [member] | Forwards Euro - Mexican Peso [Member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Liabilities | €		200
2022 [member] | Swaps US Dollar-Mexican peso [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Asset	1,600
2023 [member] | Put option [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Liabilities | €		€ 374
2025 and Thereafter [member] | Swaps US Dollar-Mexican peso [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Asset	1,890
2025 and Thereafter [member] | Swaps Yen-US Dollar [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Asset | ¥				¥ 9,750
Notional amount, Liabilities | ¥						¥ 3,250
2025 and Thereafter [member] | Swaps Dollar- Euro [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Liabilities	800
2025 and Thereafter [member] | Swaps Pound sterling-Euro [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Liabilities | £					640
2025 and Thereafter [member] | Swaps US Dollar- Euro [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Asset	$ 150
2025 and Thereafter [member] | Swaps Pound sterling – US Dollar [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount, Asset | £					1,010
Notional amount, Liabilities | £					£ 550

Inventories, Net - Summary of A

Inventories, Net - Summary of Analysis of Inventories (Detail) $ in Thousands, $ in Millions	Dec. 31, 2020MXN ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019MXN ($)
Classes of current inventories [abstract]
Mobile phones, accessories, computers, TVs, cards and other materials	$ 33,763,086		$ 43,954,616
Less: Reserve for obsolete and slow-moving inventories	(3,385,647)		(2,852,604)
Total	$ 30,377,439	$ 1,523	$ 41,102,012

Inventories, net - Additional I

Inventories, net - Additional Information (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of inventories [abstract]
Cost of inventories recognized in cost of sales	$ 167,546,288	$ 174,543,602	$ 180,013,986

Other Assets, Net - Summary of

Other Assets, Net - Summary of Analysis of Other Assets (Detail) $ in Thousands, $ in Millions	Dec. 31, 2020MXN ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019MXN ($)
Current portion:
Advances to suppliers (different from PP&E and inventories)	$ 7,600,644		$ 7,718,343
Prepaid insurance	1,300,019		978,927
Other	93,244		776,164
Other current assets	8,993,907	$ 451	9,473,434
Non-current portion:
Recoverable taxes	11,559,961		14,647,726
Prepayments for the use of fiber optics	2,709,358		2,095,556
Judicial Deposits	15,402,840		19,506,147
Prepaid expenses	8,743,667		5,642,590
Total	$ 38,415,826		$ 41,892,019

Other assets, net - Additional

Other assets, net - Additional Information (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other assets [member]
Disclosure of other assets [line items]
Amortization expense for other assets	$ 213,833	$ 318,824	$ 798,243

Other Assets, Net - Summary o_2

Other Assets, Net - Summary of Analysis of Other Assets (Parenthetical) (Detail) - MXN ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Disclosure of Other Assets [line items]
Judicial deposits	$ 15,402,840	$ 19,506,147
Brazil [member]
Disclosure of Other Assets [line items]
Judicial deposits	$ 15,402,840	$ 19,506,147

Property, Plant and Equipment_3

Property, Plant and Equipment, Net - Schedule of Property, Plant and Equipment, Net (Detail) $ in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2020MXN ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	$ 639,343,370		$ 640,000,720	$ 676,343,198
Additions	198,788,458		238,821,559	240,263,874
Retirements	(106,489,087)		(112,234,066)	(106,977,930)
Business combinations	1,053,921		10,919,581	143,016
Revaluation adjustments	107,152,628
Effect of translation of foreign subsidiaries	(1,598,974)		(23,371,038)	(40,655,711)
Depreciation of the year	(115,320,685)		(114,793,386)	(129,115,727)
Ending balance	722,929,631	$ 36,239	639,343,370	640,000,720
Cost [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	1,319,587,687		1,285,672,457	1,303,278,914
Additions	198,788,458		238,821,559	240,263,874
Retirements	(143,373,691)		(138,455,063)	(140,581,001)
Business combinations	1,053,921		10,919,581	143,016
Revaluation adjustments	107,152,628
Transfers	(62,050,212)
Effect of translation of foreign subsidiaries	(65,357,954)		(77,370,847)	(117,432,346)
Ending balance	1,355,800,837		1,319,587,687	1,285,672,457
Cost [member] | Network in operation in operation and equipment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	990,673,603		969,195,936	989,665,946
Additions	90,387,449		82,992,062	68,900,443
Retirements	(19,574,391)		(13,417,360)	(1,610,246)
Business combinations	996,974		9,572,805	128,246
Revaluation adjustments	107,152,628
Transfers	(62,050,212)
Effect of translation of foreign subsidiaries	(49,993,808)		(57,669,840)	(87,888,453)
Ending balance	1,057,592,243		990,673,603	969,195,936
Cost [member] | Land and buildings [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	50,801,253		57,130,326	62,584,189
Additions	570,062		1,530,677	4,429,433
Retirements	(2,853,037)		(4,025,222)	(3,987,671)
Business combinations			115,935	8,874
Effect of translation of foreign subsidiaries	369,300		(3,950,463)	(5,904,499)
Ending balance	48,887,578		50,801,253	57,130,326
Cost [member] | Other assets [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	162,340,564		149,809,137	150,315,807
Additions	17,474,218		26,881,611	25,268,252
Retirements	(14,454,598)		(7,594,735)	(13,377,798)
Business combinations	55,848		1,021,051	2,578
Effect of translation of foreign subsidiaries	(8,393,187)		(7,776,500)	(12,399,702)
Ending balance	157,022,845		162,340,564	149,809,137
Cost [member] | Construction in process and advances plant suppliers [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	81,539,174		81,092,529	74,121,374
Additions	59,635,316		82,640,305	92,285,397
Retirements	(68,661,847)		(76,892,011)	(76,978,798)
Business combinations	1,099		209,790	1,379
Effect of translation of foreign subsidiaries	(5,011,829)		(5,511,439)	(8,336,823)
Ending balance	67,501,913		81,539,174	81,092,529
Cost [member] | Spare parts for operation of the network [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	34,233,093		28,444,529	26,591,598
Additions	30,721,413		44,776,904	49,380,349
Retirements	(37,829,818)		(36,525,735)	(44,626,488)
Business combinations				1,939
Effect of translation of foreign subsidiaries	(2,328,430)		(2,462,605)	(2,902,869)
Ending balance	24,796,258		34,233,093	28,444,529
Accumulated depreciation [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	680,244,317		645,671,737	626,935,716
Retirements	(36,884,604)		(26,220,997)	(33,603,071)
Transfers	(62,050,212)
Effect of translation of foreign subsidiaries	(63,758,980)		(53,999,809)	(76,776,635)
Depreciation of the year	115,320,685		114,793,386	129,115,727
Ending balance	632,871,206		680,244,317	645,671,737
Accumulated depreciation [member] | Network in operation in operation and equipment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	580,370,101		560,005,547	552,345,509
Retirements	(25,726,856)		(24,954,514)	(28,712,096)
Transfers	(62,050,212)
Effect of translation of foreign subsidiaries	(58,055,450)		(47,778,627)	(67,907,227)
Depreciation of the year	96,729,723		93,097,695	104,279,361
Ending balance	531,267,306		580,370,101	560,005,547
Accumulated depreciation [member] | Other assets [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	90,332,191		76,533,494	63,359,529
Retirements	(9,317,821)		(695,425)	(2,418,837)
Effect of translation of foreign subsidiaries	(5,120,175)		(4,754,982)	(6,579,983)
Depreciation of the year	16,549,822		19,249,104	22,172,785
Ending balance	92,444,017		90,332,191	76,533,494
Accumulated depreciation [member] | Spare parts for operation of the network [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	74,717		321,747	575,393
Retirements	(176,131)		(283,986)	(160,696)
Effect of translation of foreign subsidiaries	38,898		(79,226)	(131,429)
Depreciation of the year	135,000		116,182	38,479
Ending balance	72,484		74,717	321,747
Accumulated depreciation [member] | Buildings [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	9,467,308		8,810,949	10,655,285
Retirements	(1,663,796)		(287,072)	(2,311,442)
Effect of translation of foreign subsidiaries	(622,253)		(1,386,974)	(2,157,996)
Depreciation of the year	1,906,140		2,330,405	2,625,102
Ending balance	$ 9,087,399		$ 9,467,308	$ 8,810,949

Property, Plant and Equipment_4

Property, Plant and Equipment, net - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2020MXN ($)
Disclosure of detailed information about property, plant and equipment [line items]
Methods used to determine stage of completion of construction in progress	The completion period of construction in progress is variable and depends upon the type of plant and equipment under construction.
Telecommunications Towers [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Net income from the revaluation of the telecommunications towers	$ 107,152,628

Property, Plant and Equipment_5

Property, Plant and Equipment, net - Summary of fair value measurement for the revalued telecommunications towers (Detail) - 12 months ended Dec. 31, 2020 $ in Thousands, $ in Millions	MXN ($)	USD ($)
Disclosure of fair value measurement of assets [line items]
Beginning balance	$ 1,531,933,657
Ending Balance	1,625,048,227	$ 81,463
Telecommunication towers [member]
Disclosure of fair value measurement of assets [line items]
Beginning balance	615,777,003
Supplement for change in accounting policy	107,152,628
Ending Balance	$ 722,929,631

Property, Plant and Equipment_6

Property, Plant and Equipment, Net - Schedule of Relevant Information Related to Computation of Capitalized Borrowing Costs (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]
Capitalized interest	$ 1,771,613	$ 2,233,358	$ 2,020,288
Capitalization rate	3.72%	4.16%
Property, plant and equipment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Amount invested in the acquisition of qualifying assets	$ 46,528,232	$ 50,783,957	45,456,630
Capitalized interest	$ 1,771,613	$ 2,233,358	$ 2,020,288
Capitalization rate	3.80%	4.40%	4.40%

Intangible Assets, Net and Go_3

Intangible Assets, Net and Goodwill - Summary of Analysis of Intangible Assets (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Licenses and rights of use [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Balance at beginning of year	$ 111,432,979	$ 103,298,395	$ 113,304,386
Acquisitions	15,079,714	13,206,877	4,227,244
Acquisitions in business combinations	4,436,313	7,844,339
Disposals and other	1,608,873	4,894,490	502,397
Amortization of the year	(14,274,497)	(11,577,160)	(11,347,089)
Effect of translation of foreign subsidiaries	197,715	(6,233,962)	(3,388,543)
Balance at end of year	118,481,097	111,432,979	103,298,395
Licenses and rights of use [member] | Cost [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Balance at beginning of year	246,100,862	233,478,974	247,413,824
Acquisitions	15,079,714	13,206,877	4,227,244
Acquisitions in business combinations	4,436,313	7,844,339
Disposals and other	1,502,981	7,286,114	1,508,274
Effect of translation of foreign subsidiaries	(14,029,709)	(15,715,442)	(19,670,368)
Balance at end of year	253,090,161	246,100,862	233,478,974
Licenses and rights of use [member] | Accumulated depreciation [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Balance at beginning of year	(134,667,883)	(130,180,579)	(134,109,438)
Disposals and other	105,892	(2,391,624)	(1,005,877)
Amortization of the year	(14,274,497)	(11,577,160)	(11,347,089)
Effect of translation of foreign subsidiaries	14,227,424	9,481,480	16,281,825
Balance at end of year	(134,609,064)	(134,667,883)	(130,180,579)
Trademarks [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Balance at beginning of year	3,488,709	4,667,205	9,937,807
Acquisitions	162,309	53,467	159,958
Acquisitions in business combinations	12,110		6,631
Disposals and other	(276)	(6,012)
Amortization of the year	(300,727)	(1,008,483)	(4,973,602)
Effect of translation of foreign subsidiaries	415,293	(217,468)	(463,589)
Balance at end of year	3,777,418	3,488,709	4,667,205
Trademarks [member] | Cost [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Balance at beginning of year	27,419,008	28,207,166	28,779,212
Acquisitions	162,309	53,467	159,958
Acquisitions in business combinations	12,110		6,631
Disposals and other	4,000	(6,012)
Effect of translation of foreign subsidiaries	1,534,938	(835,613)	(738,635)
Balance at end of year	29,132,365	27,419,008	28,207,166
Trademarks [member] | Accumulated depreciation [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Balance at beginning of year	(23,930,299)	(23,539,961)	(18,841,405)
Acquisitions		0
Disposals and other	(4,276)	0
Amortization of the year	(300,727)	(1,008,483)	(4,973,602)
Effect of translation of foreign subsidiaries	(1,119,645)	618,145	275,046
Balance at end of year	(25,354,947)	(23,930,299)	(23,539,961)
Customer relationships [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Balance at beginning of year	3,099,381	6,781,531	10,856,219
Acquisitions	1,935	20,248	74,637
Acquisitions in business combinations	2,689,718		15,556
Disposals and other	(4,908)	5,507
Amortization of the year	(1,654,237)	(3,371,924)	(3,754,312)
Effect of translation of foreign subsidiaries	21,772	(335,981)	(410,569)
Balance at end of year	4,153,661	3,099,381	6,781,531
Customer relationships [member] | Cost [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Balance at beginning of year	22,875,011	25,543,068	26,985,714
Acquisitions	1,935	20,248	74,637
Acquisitions in business combinations	2,689,718		15,556
Disposals and other	(5,763)	5,507
Effect of translation of foreign subsidiaries	4,018,365	(2,693,812)	(1,532,839)
Balance at end of year	29,579,266	22,875,011	25,543,068
Customer relationships [member] | Accumulated depreciation [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Balance at beginning of year	(19,775,630)	(18,761,537)	(16,129,495)
Acquisitions		0
Disposals and other	855	0
Amortization of the year	(1,654,237)	(3,371,924)	(3,754,312)
Effect of translation of foreign subsidiaries	(3,996,593)	2,357,831	1,122,270
Balance at end of year	(25,425,605)	(19,775,630)	(18,761,537)
Software licenses [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Balance at beginning of year	5,103,367	6,604,455	7,240,437
Acquisitions	2,445,784	2,729,480	2,004,550
Acquisitions in business combinations	36		3,006
Disposals and other	(471,812)	(949,859)	1,772,238
Amortization of the year	(2,667,870)	(2,479,088)	(3,491,629)
Effect of translation of foreign subsidiaries	658,193	(801,621)	(924,147)
Balance at end of year	5,067,698	5,103,367	6,604,455
Software licenses [member] | Cost [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Balance at beginning of year	13,104,110	14,309,258	15,055,598
Acquisitions	2,445,784	2,729,480	2,004,550
Acquisitions in business combinations	36		3,006
Disposals and other	(2,485,429)	(949,858)	(905,610)
Amortization of the year		0
Effect of translation of foreign subsidiaries	4,236,645	(2,984,770)	(1,848,286)
Balance at end of year	17,301,146	13,104,110	14,309,258
Software licenses [member] | Accumulated depreciation [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Balance at beginning of year	(8,000,743)	(7,704,803)	(7,815,161)
Acquisitions		0
Disposals and other	2,013,617	(1)	2,677,848
Amortization of the year	(2,667,870)	(2,479,088)	(3,491,629)
Effect of translation of foreign subsidiaries	(3,578,452)	2,183,149	924,139
Balance at end of year	(12,233,448)	(8,000,743)	(7,704,803)
Content rights [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Balance at beginning of year	2,044,953	786,117	2,200,777
Acquisitions	1,570,415	1,427,694	850,779
Disposals and other	(313,942)	1,629,287
Amortization of the year	(1,440,749)	(1,772,779)	(2,231,978)
Effect of translation of foreign subsidiaries	116,416	(25,366)	(33,461)
Balance at end of year	1,977,093	2,044,953	786,117
Content rights [member] | Cost [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Balance at beginning of year	10,160,182	7,549,709	6,717,442
Acquisitions	1,570,415	1,427,694	850,779
Disposals and other	(313,942)	1,638,007
Effect of translation of foreign subsidiaries	619,657	(455,228)	(18,512)
Balance at end of year	12,036,312	10,160,182	7,549,709
Content rights [member] | Accumulated depreciation [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Balance at beginning of year	(8,115,229)	(6,763,592)	(4,516,665)
Disposals and other		(8,720)
Amortization of the year	(1,440,749)	(1,772,779)	(2,231,978)
Effect of translation of foreign subsidiaries	(503,241)	429,862	(14,949)
Balance at end of year	(10,059,219)	(8,115,229)	(6,763,592)
Intangibles, net [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Balance at beginning of year	125,169,389	122,137,703	143,539,626
Acquisitions	19,260,157	17,437,766	7,317,168
Acquisitions in business combinations	7,138,177	7,844,339	25,193
Disposals and other	817,935	5,573,413	2,274,635
Amortization of the year	(20,338,080)	(20,209,434)	(25,798,610)
Effect of translation of foreign subsidiaries	1,409,389	(7,614,398)	(5,220,309)
Balance at end of year	133,456,967	125,169,389	122,137,703
Goodwill [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Balance at beginning of year	152,899,801	145,566,497	151,463,232
Acquisitions in business combinations	(7,014,120)	10,869,571	334,739
Disposals and other	(537,343)	(843,005)	(1,094,861)
Effect of translation of foreign subsidiaries	(2,295,479)	(2,693,262)	(5,136,613)
Balance at end of year	$ 143,052,859	$ 152,899,801	$ 145,566,497

Intangible Assets, Net and Go_4

Intangible Assets, Net and Goodwill - Summary of Aggregate Carrying Amount of Goodwill (Detail) $ in Thousands, $ in Millions	Dec. 31, 2020MXN ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)
Disclosure of carrying value of goodwill [line items]
Goodwill	$ 143,052,859	$ 7,171	$ 152,899,801	$ 145,566,497
Europe [member]
Disclosure of carrying value of goodwill [line items]
Goodwill	53,388,139		52,950,325
Brazil [member]
Disclosure of carrying value of goodwill [line items]
Goodwill	18,730,686		28,062,398
Puerto Rico [member]
Disclosure of carrying value of goodwill [line items]
Goodwill	17,463,394		17,463,394
Dominican Republic [member]
Disclosure of carrying value of goodwill [line items]
Goodwill	14,186,723		14,186,723
Mexico [member]
Disclosure of carrying value of goodwill [line items]
Goodwill	10,148,380		10,148,380
Ecuador [member]
Disclosure of carrying value of goodwill [line items]
Goodwill	2,155,384		2,155,384
Peru [member]
Disclosure of carrying value of goodwill [line items]
Goodwill	2,710,979		2,739,947
El Salvador [member]
Disclosure of carrying value of goodwill [line items]
Goodwill	2,499,544		2,499,552
Chile [member]
Disclosure of carrying value of goodwill [line items]
Goodwill	2,558,098		2,364,816
Colombia [member]
Disclosure of carrying value of goodwill [line items]
Goodwill	12,253,743		12,124,685
Other countries [member]
Disclosure of carrying value of goodwill [line items]
Goodwill	1,293,356		1,738,479
United States (Tracfone) [member]
Disclosure of carrying value of goodwill [line items]
Goodwill	3,362,900		3,220,105
Guatemala [member]
Disclosure of carrying value of goodwill [line items]
Goodwill	$ 2,301,533		$ 3,245,613

Intangible Assets, Net and Go_5

Intangible Assets, Net and Goodwill - Additional Information (Detail) R$ in Thousands, $ in Thousands, $ in Thousands, € in Millions

1 Months Ended

12 Months Ended

Feb. 29, 2020MXN ($)Band

Feb. 29, 2020USD ($)Band

Jan. 31, 2020MXN ($)

Dec. 31, 2019MXN ($)

Dec. 31, 2019COP ($)

Jan. 31, 2019MXN ($)

Dec. 31, 2018MXN ($)

Dec. 31, 2018BRL (R$)

Dec. 31, 2020MXN ($)

Dec. 31, 2020EUR (€)

Dec. 31, 2019MXN ($)

Dec. 31, 2018MXN ($)

Acquisitions 2020 [Member]

Disclosure of intangible assets and goodwill [line items]

Amortization of intangible assets

$ 20,338,080

$ 20,209,434

$ 25,798,610

IFETEL [Member]

Disclosure of intangible assets and goodwill [line items]

Amount paid for license

$ 459,668

Estimated useful life of intangible assets

20 years

Submarine Cable [Member]

Disclosure of intangible assets and goodwill [line items]

Estimated useful life of intangible assets

10 years

Renewal of license [member]

Disclosure of intangible assets and goodwill [line items]

Amount paid for license

3,457,251

Twenty Twenty Business Acquisition [Member]

Disclosure of intangible assets and goodwill [line items]

Number of brands | Band

2,500

2,500

30 Mhz spectrum [member] | Twenty Twenty Business Acquisition [Member]

Disclosure of intangible assets and goodwill [line items]

Amount paid for license

$ 9,246,825

$ 30

Estimated useful life of intangible assets

20 years

20 years

400 MHZ [Member] | Renewal of license [member]

Disclosure of intangible assets and goodwill [line items]

Amount paid for license

$ 1,649,525

400 MHZ [Member] | Twenty Twenty Business Acquisition [Member]

Disclosure of intangible assets and goodwill [line items]

Amount paid for license

1,806,875

Dominican Republic [member]

Disclosure of intangible assets and goodwill [line items]

Amount paid for license

$ 709,829

R$ 1831427

Estimated useful life of intangible assets

11 years

11 years

Paraguay Puerto Rico Europe Argentina and other countries [member]

Disclosure of intangible assets and goodwill [line items]

Amount paid for license

3,517,415

Comcel [Member] | Renewal of license [member]

Disclosure of intangible assets and goodwill [line items]

Amount paid for license

$ 2,753,768

$ (468,511,573,375)

Estimated useful life of intangible assets

20 years

20 years

Puerto Rico Argentina Guatemala Panam And Others Countries [Member]

Disclosure of intangible assets and goodwill [line items]

Amount paid for license

$ 1,862,934

Puerto Rico Argentina Guatemala Panam And Others Countries [Member] | Twenty Twenty Business Acquisition [Member]

Disclosure of intangible assets and goodwill [line items]

Amount paid for license

1,701,682

CTE [Member] | Twenty Twenty Business Acquisition [Member]

Disclosure of intangible assets and goodwill [line items]

Amount paid for license

$ 620,052

Number Of Pair of Frequencies

12 months

Austria [member]

Disclosure of intangible assets and goodwill [line items]

Amount paid for license

$ 3,023,732

Austria [member] | 3.5 GHz [Member]

Disclosure of intangible assets and goodwill [line items]

Amount paid for license | €

€ 64.3

Belarus [member] | 2.1 GHz [Member]

Disclosure of intangible assets and goodwill [line items]

Amount paid for license | €

9.5

Croatia [member] | 2.1 GHz [Member]

Disclosure of intangible assets and goodwill [line items]

Amount paid for license | €

€ 7.2

Slovenia [member] | Twenty Twenty Business Acquisition [Member]

Disclosure of intangible assets and goodwill [line items]

Amount paid for license

$ 1,704,280

Business Combinations, Acquis_3

Business Combinations, Acquisitions and Non-controlling Interest - Additional Information (Detail) $ in Thousands	Dec. 18, 2019MXN ($)	Apr. 24, 2019MXN ($)	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)
Disclosure of detailed information about business combination [line items]
Percentage of voting equity interests acquired				80.00%
Other Entities [member]
Disclosure of detailed information about business combination [line items]
Net of cash paid				$ 152,896
Additional non-controlling interest acquired				1,104,662
Nextel Telecomunicacoes Ltda [member]
Disclosure of detailed information about business combination [line items]
Amount paid for business acquisition net of cash acquired	$ 6,905,539
Goodwill amount recognized					$ 1,912,372
Acquisition of fixed and mobile line operator	100.00%
Consideration transferred, acquisition-date fair value	$ 17,992,362
Liabilities incurred	$ 9,325,712
ClaroTelefnica Moviles Guatemala SA [Member]
Disclosure of detailed information about business combination [line items]
Amount paid for business acquisition net of cash acquired		$ 5,734,254
Goodwill amount recognized					$ 1,195,136
Acquisition of fixed and mobile line operator		100.00%
Claro [Member] | Twenty Twenty Business Acquisition [Member]
Disclosure of detailed information about business combination [line items]
Consideration transferred, acquisition-date fair value				$ 16,500,000
Percentage of voting equity interests acquired				32.00%
Proportion of voting rights held in subsidiary			22.00%
Number Of Mobile Access Sites			$ 4,700

Business Combinations, Acquis_4

Business Combinations, Acquisitions and Non-controlling Interest - Summary of Financial Statements and the Values of the Assets Acquired and Liabilities (Detail) $ in Thousands	Dec. 31, 2019MXN ($)
ClaroTelefnica Moviles Guatemala SA [Member]
Disclosure of detailed information about business combination [line items]
Current assets	$ 1,312,906
Other non-current assets	257,853
Intangible assets (excluding goodwill)	1,354,105
Property, plant and equipment	4,144,334
Rights-of-use assets	864,046
Total assets acquired	7,933,244
Accounts payable	1,248,470
Other liabilities	1,705,580
Total liabilities assumed	2,954,050
Fair value of assets acquired and liabilities assumed, net	4,979,194
Acquisition Price and Purchase consideration transferred	6,174,330
Goodwill	1,195,136
Nextel Telecomunicacoes Ltda [member]
Disclosure of detailed information about business combination [line items]
Current assets	6,366,943
Other non-current assets	5,970,810
Intangible assets (excluding goodwill)	12,914,175
Property, plant and equipment	5,147,093
Rights-of-use assets	8,086,655
Total assets acquired	38,485,676
Accounts payable	9,170,230
Other liabilities	22,504,097
Total liabilities assumed	31,674,327
Fair value of assets acquired and liabilities assumed, net	6,811,349
Acquisition Price and Purchase consideration transferred	8,723,721
Goodwill	$ 1,912,372

Business Combinations, Acquis_5

Business Combinations, Acquisitions and Non-controlling Interest - Summary of Selected Financial Data From Consolidated Statements of Financial Position (Detail) $ in Thousands, $ in Millions	Dec. 31, 2020MXN ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)	Dec. 31, 2017MXN ($)
Assets:
Current assets	$ 360,223,237	$ 18,059	$ 330,844,323
Total assets	1,625,048,227	81,463	1,531,933,657	$ 1,429,223,392
Liabilities and equity:
Current liabilities	507,310,678	25,431	525,399,745
Non-current liabilities	802,619,931	40,235	779,627,047
Total liabilities	1,309,930,609	65,666	1,305,026,792	1,183,350,970
Equity attributable to equity holders of the parent	250,478,803	12,557	177,909,959
Non-controlling interest	64,638,815	3,240	48,996,906
Total equity	315,117,618	15,797	226,906,865	$ 245,872,422	$ 260,633,517
Total liabilities and equity	1,625,048,227	$ 81,463	1,531,933,657
Subsidiaries with material non-controlling interests [member]
Assets:
Current assets	32,775,046		29,516,038
Non-current assets	150,747,947		137,724,390
Total assets	183,522,993		167,240,428
Liabilities and equity:
Current liabilities	49,942,415		34,608,254
Non-current liabilities	82,293,652		89,711,288
Total liabilities	132,236,067		124,319,542
Equity attributable to equity holders of the parent	26,129,649		21,864,132
Non-controlling interest	25,157,277		21,056,754
Total equity	51,286,926		42,920,886
Total liabilities and equity	$ 183,522,993		$ 167,240,428

Business Combinations, Acquis_6

Business Combinations, Acquisitions and Non-controlling Interest - Summary of Consolidated Statements of Comprehensive Income (Detail) $ in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2020MXN ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)
Disclosure of detailed information about business combination [line items]
Operating costs and expenses	$ 851,531,619	$ 42,686	$ 852,507,334	$ 898,650,510
Operating income	165,354,911	8,289	154,840,535	139,557,171
Net income	51,026,957	2,559	70,313,455	54,516,823
Total comprehensive income	104,489,719	5,237	6,124,939	(12,805,619)
Distribution of the net profit (loss) to:
Equity holders of the parent	46,852,605	2,349	67,730,891	52,566,197
Non-controllinginterest	4,174,352	210	2,582,564	1,950,626
Net income	51,026,957	2,559	70,313,455	54,516,823
Comprehensive income (loss) for the year attributable to:
Equity holders of the parent	86,150,118	4,319	5,450,679	(11,770,227)
Non-controllinginterest	18,339,601	918	674,260	(1,035,392)
Total comprehensive income (loss) for the year	104,489,719	$ 5,237	6,124,939	(12,805,619)
Subsidiaries with material non-controlling interests [member]
Disclosure of detailed information about business combination [line items]
Operating revenues	111,472,191		98,420,289	100,716,444
Operating costs and expenses	98,312,325		89,732,428	95,984,880
Operating income	13,159,866		8,687,861	4,731,564
Net income	7,787,388		5,051,145	3,809,694
Total comprehensive income	12,103,406		1,466,783	5,047,838
Distribution of the net profit (loss) to:
Equity holders of the parent	3,986,412		2,565,733	1,942,944
Non-controllinginterest	3,800,976		2,485,412	1,866,750
Net income	7,787,388		5,051,145	3,809,694
Comprehensive income (loss) for the year attributable to:
Equity holders of the parent	6,172,737		748,059	2,574,397
Non-controllinginterest	5,930,669		718,724	2,473,441
Total comprehensive income (loss) for the year	$ 12,103,406		$ 1,466,783	$ 5,047,838

Income Taxes - Summary of Compo

Income Taxes - Summary of Composition of Income Tax Expense (Detail) $ in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2020MXN ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Income tax expense	$ 16,366,152	$ 820	$ 51,033,533	$ 46,477,079
Mexico [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Current year income tax	13,407,948		26,295,431	28,572,414
Deferred income tax	(9,334,246)		208,658	(2,688,727)
Foreign [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Current year income tax	15,250,218		20,843,720	19,898,728
Deferred income tax	$ (2,957,768)		$ 3,685,724	$ 694,664

Income Taxes - Summary of Defer

Income Taxes - Summary of Deferred Tax Related to Items Recognized in OCI (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Major components of tax expense (income) [abstract]
Remeasurement of defined benefit plans	$ 4,151,600	$ 9,217,320	$ 408,735
Equity investments at fair value	(665,814)	(378,606)	1,613,667
Other	(35,670)		(8,922)
Revaluation assets	(29,922,597)
Deferred tax benefit recognized in OCI	$ (26,472,481)	$ 8,838,714	$ 2,013,480

Income Taxes - Summary of Recon

Income Taxes - Summary of Reconciliation of Statutory Income Tax Rate in Mexico to Consolidated Effective Income Tax Rate Recognized (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Statutory income tax rate in Mexico	30.00%	30.00%	30.00%
Impact of non-deductibleand non-taxable items:
Tax inflation effects	6.10%	3.50%	7.30%
Derivatives	(0.70%)	(0.10%)	0.40%
Employee benefits	3.00%	1.80%	1.30%
Other	(2.40%)	1.80%	6.30%
Dividends received from associates Equity	(0.90%)	(0.40%)	(0.80%)
Foreign subsidiaries and other non-deductible items, net	(1.50%)	5.50%	1.50%
Effective tax rate	24.30%	42.10%	46.00%
Mexico [member]
Impact of non-deductibleand non-taxable items:
Effective tax rate	36.00%	37.00%	45.30%
Brazil [member]
Impact of non-deductibleand non-taxable items:
Tax recoveries in Brazil	(9.30%)

Income Taxes - Summary of Analy

Income Taxes - Summary of Analysis of Temporary Differences Giving Rise to Net Deferred Tax Liability (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax assets	$ 66,303,077	$ 88,074,856	$ 86,613,327	$ 104,573,985
Deferred tax expense in net profit for the year	12,292,014	(3,894,383)	1,994,063
Provisions [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax assets	19,312,081	17,964,305
Deferred tax expense in net profit for the year	4,458,848	(257,070)	1,841,705
Deferred revenues [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax assets	6,748,101	5,820,260
Deferred tax expense in net profit for the year	897,762	(1,077,259)	3,632,051
Tax losses carry forward [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax assets	25,121,933	26,630,407
Deferred tax expense in net profit for the year	2,236,244	(9,873)	(5,833,660)
Property, plant and equipment [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax assets	(39,459,549)	(11,962,544)
Deferred tax expense in net profit for the year	3,524,761	(461,594)	453,493
Inventories [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax assets	(537,404)	1,787,065
Deferred tax expense in net profit for the year	(2,393,979)	(291,531)	81,270
Licenses and rights of use [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax assets	(5,177,924)	(3,399,931)
Deferred tax expense in net profit for the year	344,729	432,403	961,402
Employee benefits [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax assets	45,467,827	41,743,744
Deferred tax expense in net profit for the year	422,473	(1,019,042)	1,128,209
Other [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax assets	14,828,012	9,491,550
Deferred tax expense in net profit for the year	$ 2,801,176	$ (1,210,417)	$ (270,407)

Income Taxes - Summary of Rec_2

Income Taxes - Summary of Reconciliation of Deferred Tax Assets and Liabilities, Net (Detail) $ in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)
Reconciliation of changes in deferred tax liability (asset) [abstract]
Deferred Tax (Liability) Asset Beginning Balance	$ 88,074,856	$ 86,613,327	$ 104,573,985
Deferred tax benefit	12,292,014	(3,894,383)	1,994,063
Translation effect	375,105	2,047,915	(8,854,010)
Deferred tax benefit recognized in OCI	(26,472,481)	8,838,714	2,013,480
Deferred taxes acquired in business combinations	(2,580,552)	(276,568)	(25,827)
Hyperinflationary effect in Argentina	(5,385,865)	(5,254,149)	(4,907,151)
Effect of adoption of IFRS 9			544,628
Effect of adoption of IFRS 15			(8,725,841)
Deferred tax (liability) asset ending balance	66,303,077	88,074,856	86,613,327
Presented in the consolidated statements of financial position as follows:
Deferred income tax assets				$ 115,370,240	$ 5,783	$ 106,167,897	$ 111,186,768
Deferred income tax liabilities				(49,067,163)	$ (2,460)	(18,093,041)	(24,573,441)
Deferred tax assets and liabilities, net	$ 88,074,856	$ 86,613,327	$ 104,573,985	$ 66,303,077		$ 88,074,856	$ 86,613,327

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) R$ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020MXN ($)	Dec. 31, 2020BRL (R$)	Dec. 31, 2019MXN ($)	Dec. 31, 2019BRL (R$)	Dec. 31, 2018MXN ($)	Dec. 31, 2018BRL (R$)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Effective income tax rate for foreign jurisdiction	18.00%	18.00%	40.00%	40.00%	31.00%	31.00%
Percentage of share with voting right	80.00%
Accounting profit	$ 1,721,453	R$ 411336	$ 2,748,084	R$ 656646	$ 2,748,084	R$ 656646
Brazil [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net operating loss carryforwards	$ 44,578,152
Effective taxable income percentage carryforward	30.00%	30.00%
Effective taxable income percentage	25.00%	25.00%
Corporate tax rate	34.00%	34.00%
Austria [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net operating loss carryforwards	$ 11,631,381
operating loss carryforward effective tax rate annual limit	75.00%	75.00%
Mexico [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Accumulated tax loss	$ 20,523,070
Bottom of range [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Statutory tax rates	10.00%	10.00%
Top of range [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Statutory tax rates	34.00%	34.00%
CUCA [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Contributed capital account	$ 573,362,949		551,221,490
CUFIN [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Contributed capital account	$ 332,273,039		$ 320,880,512

Income Taxes - Available Tax Lo

Income Taxes - Available Tax Loss Carryforwards Recorded in Deferred Tax Assets (Detail) $ in Thousands	Dec. 31, 2020MXN ($)
Disclosure of tax losses available for carryforward [line items]
Gross balance of available tax loss carryforwards at December 31, 2020	$ 80,142,388
Tax-effected loss carryforward benefit	25,121,933
Brazil [member]
Disclosure of tax losses available for carryforward [line items]
Gross balance of available tax loss carryforwards at December 31, 2020	44,578,152
Tax-effected loss carryforward benefit	15,156,572
Mexico [member]
Disclosure of tax losses available for carryforward [line items]
Gross balance of available tax loss carryforwards at December 31, 2020	20,523,070
Tax-effected loss carryforward benefit	6,156,920
Austria [member]
Disclosure of tax losses available for carryforward [line items]
Gross balance of available tax loss carryforwards at December 31, 2020	11,631,381
Tax-effected loss carryforward benefit	2,907,845
United States [Member]
Disclosure of tax losses available for carryforward [line items]
Gross balance of available tax loss carryforwards at December 31, 2020	3,023,441
Tax-effected loss carryforward benefit	786,095
Peru [member]
Disclosure of tax losses available for carryforward [line items]
Gross balance of available tax loss carryforwards at December 31, 2020	380,770
Tax-effected loss carryforward benefit	112,327
Puerto Rico [member]
Disclosure of tax losses available for carryforward [line items]
Gross balance of available tax loss carryforwards at December 31, 2020	5,574
Tax-effected loss carryforward benefit	$ 2,174

Debt - Summary of Short- and Lo

Debt - Summary of Short- and Long-Term Debt (Detail) $ in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2020USD ($)
Disclosure of detailed information about borrowings [line items]
Borrowings	$ 628,382,956	$ 624,254,477
Less: Short-term debt and current portion of long-term debt	148,083,184	129,172,033	$ 7,423
Long-term debt	$ 480,299,772	495,082,444	$ 24,077
Hybrid Notes [member]
Disclosure of detailed information about borrowings [line items]
Borrowings maturity	2073
Borrowings	$ 13,403,133	25,362,813
Lines of credit [member]
Disclosure of detailed information about borrowings [line items]
Less: Short-term debt and current portion of long-term debt	53,062,260	40,722,004
Finance Lease [member]
Disclosure of detailed information about borrowings [line items]
Less: Short-term debt and current portion of long-term debt	13,910	11,743
Line of credit and others [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	53,119,526	53,699,481
U.S. dollars [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	$ 186,531,417	$ 169,142,643
U.S. dollars [member] | Fixed-rate Senior notes interest rate 5.000% maturing 2020 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate		5.00%
Borrowings maturity		2020
Borrowings		$ 11,774,764
U.S. dollars [member] | Fixed-rate Senior notes interest rate 3.125% maturing 2022 [Member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	3.125%	3.125%	3.125%
Borrowings maturity	2022	2022
Borrowings	$ 31,917,920	$ 30,152,320
U.S. dollars [member] | Fixed-rate Senior notes interest rate 3.625% maturing 2029 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	3.625%	3.625%	3.625%
Borrowings maturity	2029	2029
Borrowings	$ 19,948,700	$ 18,845,200
U.S. dollars [member] | Fixed-rate Senior notes interest rate 6.375% maturing 2035 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	6.375%	6.375%	6.375%
Borrowings maturity	2035	2035
Borrowings	$ 19,576,258	$ 18,493,360
U.S. dollars [member] | Fixed-rate Senior notes interest rate 6.125% maturing 2037 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	6.125%	6.125%	6.125%
Borrowings maturity	2040	2037
Borrowings	$ 39,897,400	$ 6,958,119
U.S. dollars [member] | Fixed-rate Senior notes interest rate 6.125% maturing 2040 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	6.125%	6.125%	6.125%
Borrowings maturity	2037	2040
Borrowings	$ 7,365,559	$ 37,690,400
U.S. dollars [member] | Fixed Rate Senior Notes Interest Rate 4.375% Maturing 2042 [Member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	4.375%	4.375%	4.375%
Borrowings maturity	2042	2042
Borrowings	$ 22,941,005	$ 21,671,980
U.S. dollars [member] | Fixed-rate Senior notes interest rate 4.375% maturing 2049 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	4.375%	4.375%	4.375%
Borrowings maturity	2049	2049
Borrowings	$ 24,935,875	$ 23,556,500
U.S. dollars [member] | Lines of credit [member]
Disclosure of detailed information about borrowings [line items]
Borrowings		$ 9,359,340
U.S. dollars [member] | Fixed-rate Senior notes interest rate 2.875% maturing 2030
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	2.875%		2.875%
Borrowings maturity	2030
Borrowings	$ 19,948,700
U.S. dollars [member] | Bottom of range [member] | Lines of credit [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate		5.50%
Borrowings maturity		2020
U.S. dollars [member] | Top of range [member] | Lines of credit [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate		9.02%
Borrowings maturity		2024
Mexican pesos [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	$ 51,282,881	$ 58,129,292
Mexican pesos [member] | Domestic Senior Notes Interest Rate 8.600% Maturing 2020 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate		8.60%
Borrowings maturity		2020
Borrowings		$ 7,000,000
Mexican pesos [member] | Fixed Rate Senior Notes Interest Rate 6.450% Maturing 2022 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	6.45%	6.45%	6.45%
Borrowings maturity	2022	2022
Borrowings	$ 22,500,000	$ 22,500,000
Mexican pesos [member] | Fixed Rate Senior Notes Interest Rate 7.125% Maturing 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	7.125%	7.125%	7.125%
Borrowings maturity	2024	2024
Borrowings	$ 11,000,000	$ 11,000,000
Mexican pesos [member] | Domestic Senior Notes Interest Rate 0.000% Maturing 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	0.00%	0.00%	0.00%
Borrowings maturity	2025	2025
Borrowings	$ 4,911,181	$ 4,757,592
Mexican pesos [member] | Fixed Rate Senior Notes Interest Rate 8.460% Maturing 2036 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	8.46%	8.46%	8.46%
Borrowings maturity	2036	2036
Borrowings	$ 7,871,700	$ 7,871,700
Mexican pesos [member] | Domestic Senior Notes Interest Rate 8.360% Maturing 2037 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	8.36%	8.36%	8.36%
Borrowings maturity	2037	2037
Borrowings	$ 5,000,000	$ 5,000,000
Mexican pesos [member] | Lines of credit [member]
Disclosure of detailed information about borrowings [line items]
Borrowings maturity	2021	2020
Borrowings interest basis	TIIE + 0.300% - TIIE + 1.000%	TIIE + 0.050% -TIIE + 0.090%
Borrowings	$ 27,100,000	$ 22,000,000
Euros [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	224,928,934	222,190,375
Euros [member] | Hybrid Notes [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	$ 13,403,133	$ 11,622,118
Euros [member] | Commercial Paper One Interest Rate -0.230% maturing 2020 [Member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate		(0.23%)
Borrowings maturity		2020
Borrowings		$ 2,599,128
Euros [member] | Exchangable bonds interest rate 0.000% maturing 2020 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate		0.00%
Borrowings maturity		2020
Borrowings		$ 60,051,270
Euros [member] | Fixed rate senior notes interest rate 3.000% maturing 2021 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	3.00%	3.00%	3.00%
Borrowings maturity	2021	2021
Borrowings	$ 24,369,332	$ 21,131,123
Euros [member] | Fixed rate senior notes interest rate 3.125% maturing 2021 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	3.125%	3.125%	3.125%
Borrowings maturity	2021	2021
Borrowings	$ 18,276,999	$ 15,848,342
Euros [member] | Fixed rate senior notes interest rate 4.000% maturing 2022 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	4.00%	4.00%	4.00%
Borrowings maturity	2022	2022
Borrowings	$ 18,276,999	$ 15,848,342
Euros [member] | Fixed rate senior notes interest rate 4.750% maturing 2022 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	4.75%	4.75%	4.75%
Borrowings maturity	2022	2022
Borrowings	$ 18,276,999	$ 15,848,342
Euros [member] | Fixed rate senior notes interest rate 3.500% maturing 2023 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	3.50%	3.50%	3.50%
Borrowings maturity	2023	2023
Borrowings	$ 7,310,800	$ 6,339,337
Euros [member] | Fixed rate senior notes interest rate 3.259% maturing 2023 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	3.259%	3.259%	3.259%
Borrowings maturity	2023	2023
Borrowings	$ 18,276,999	$ 15,848,342
Euros [member] | Fixed rate senior notes interest rate 1.500% maturing 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	1.50%	1.50%	1.50%
Borrowings maturity	2024	2024
Borrowings	$ 20,713,932	$ 17,961,454
Euros [member] | Fixed rate senior notes interest rate 1.500% maturing 2026 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	1.50%	1.50%	1.50%
Borrowings maturity	2026	2026
Borrowings	$ 18,276,999	$ 15,848,342
Euros [member] | Fixed rate senior notes interest rate 0.750% maturing 2027 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	0.75%	0.75%	0.75%
Borrowings maturity	2027	2027
Borrowings	$ 24,369,332	$ 21,131,123
Euros [member] | Fixed rate senior notes interest rate 2.125% maturing 2028 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	2.125%	2.125%	2.125%
Borrowings maturity	2028	2028
Borrowings	$ 15,840,066	$ 13,735,230
Euros [member] | Euro Nc10 series B capital securities interest rate 6.375% maturing 2073 [member] | Hybrid Notes [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	6.375%	6.375%	6.375%
Borrowings maturity	2073	2073
Borrowings	$ 13,403,133	$ 11,622,118
Euros [member] | Lines of credit [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate		0.03%
Borrowings maturity		2020
Borrowings		$ 2,113,112
Euros [member] | Commercial Paper Four Interest Rate -0.230% - -0.310% maturing 2021
Disclosure of detailed information about borrowings [line items]
Borrowings maturity	2021
Borrowings	$ 40,940,477
Euros [member] | Bottom of range [member] | Commercial Paper Four Interest Rate -0.230% - -0.310% maturing 2021
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	(0.23%)		(0.23%)
Euros [member] | Top of range [member] | Commercial Paper Four Interest Rate -0.230% - -0.310% maturing 2021
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	(0.31%)		(0.31%)
Pound sterling [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	$ 59,993,720	54,962,779
Pound sterling [member] | Hybrid Notes [member]
Disclosure of detailed information about borrowings [line items]
Borrowings		$ 13,740,695
Pound sterling [member] | Fixed rate senior notes interest rate 5.000% maturing 2026 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	5.00%	5.00%	5.00%
Borrowings maturity	2026	2026
Borrowings	$ 13,634,936	$ 12,491,541
Pound sterling [member] | Fixed rate senior notes interest rate 5.750% maturing 2030 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	5.75%	5.75%	5.75%
Borrowings maturity	2030	2030
Borrowings	$ 17,725,417	$ 16,239,003
Pound sterling [member] | Fixed rate senior notes interest rate 4.948% maturing 2033 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	4.948%	4.948%	4.948%
Borrowings maturity	2033	2033
Borrowings	$ 8,180,962	$ 7,494,924
Pound sterling [member] | Fixed rate senior notes interest rate 4.375% maturing 2041 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	4.375%	4.375%	4.375%
Borrowings maturity	2041	2041
Borrowings	$ 20,452,405	$ 18,737,311
Pound sterling [member] | GBP NC7 capital securities interest rate 6.375% maturing 2073 [member] | Hybrid Notes [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate		6.375%
Borrowings maturity		2073
Borrowings		$ 13,740,695
Brazilian reais [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	$ 32,533,191	$ 34,948,736
Brazilian reais [member] | Debenture 102.900% of CDI maturing 2020 [member]
Disclosure of detailed information about borrowings [line items]
Interbank certificate of deposit interest rate basis		102.900% of CDI
Borrowings maturity		2020
Adjustment of interbank certificate of deposit		102.90%
Borrowings		$ 7,013,124
Brazilian reais [member] | Debenture 104.000% of CDI maturing 2021 [member]
Disclosure of detailed information about borrowings [line items]
Interbank certificate of deposit interest rate basis	104.000% of CDI	104.000% of CDI
Borrowings maturity	2021	2021
Adjustment of interbank certificate of deposit	104.00%
Borrowings	$ 4,222,597	$ 5,142,958
Brazilian reais [member] | Debenture 104.250% of CDI maturing 2021 [member]
Disclosure of detailed information about borrowings [line items]
Interbank certificate of deposit interest rate basis	104.250% of CDI	104.250% of CDI
Borrowings maturity	2021	2021
Adjustment of interbank certificate of deposit	104.25%
Borrowings	$ 5,815,668	$ 7,083,256
Brazilian reais [member] | Promissory Note CDI + 0.600% maturing 2021 [Member]
Disclosure of detailed information about borrowings [line items]
Interbank certificate of deposit interest rate basis	CDI + 0.600%	CDI + 0.600%
Borrowings maturity	2021	2021
Adjustment of interbank certificate of deposit	0.60%
Borrowings	$ 1,381,941	$ 1,683,150
Brazilian reais [member] | Promissory Note 106.000% of CDI maturing 2022 [member]
Disclosure of detailed information about borrowings [line items]
Interbank certificate of deposit interest rate basis	106.000% of CDI	106.000% of CDI
Borrowings maturity	2022	2022
Adjustment of interbank certificate of deposit	106.00%
Borrowings	$ 7,677,449	$ 9,350,832
Brazilian reais [member] | Promissory Note 106.500% of CDI maturing 2022 [member]
Disclosure of detailed information about borrowings [line items]
Interbank certificate of deposit interest rate basis		106.500% of CDI
Borrowings maturity		2022
Borrowings		$ 4,675,416
Brazilian reais [member] | Debenture 106.500% of CDI maturing 2022 [member]
Disclosure of detailed information about borrowings [line items]
Interbank certificate of deposit interest rate basis	106.500% of CDI
Borrowings maturity	2022
Adjustment of interbank certificate of deposit	106.50%
Borrowings	$ 3,838,725
Brazilian reais [member] | Debenture CDI + 0.960% maturing 2022 [member]
Disclosure of detailed information about borrowings [line items]
Interbank certificate of deposit interest rate basis	CDI + 0.960%
Borrowings maturity	2022
Adjustment of interbank certificate of deposit	0.96%
Borrowings	$ 9,596,811
Japanese yens [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	$ 2,511,701	$ 2,255,663
Japanese yens [member] | Fixed rate senior notes interest rate 2.950% maturing 2039 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	2.95%	2.95%	2.95%
Borrowings maturity	2039	2039
Borrowings	$ 2,511,701	$ 2,255,663
Chilean pesos [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	$ 4,078,453	$ 3,562,695
Chilean pesos [member] | Fixed rate senior notes interest rate 3.961% maturing 2035 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	3.961%	3.961%	3.961%
Borrowings maturity	2035	2035
Borrowings	$ 4,078,453	$ 3,562,695
Chilean pesos [member] | Lines of credit [member]
Disclosure of detailed information about borrowings [line items]
Borrowings maturity	2021	2021
Borrowings interest basis	TAB + 0.350% and TAB + 0.450%	TAB + 0.350%
Borrowings	$ 8,868,181	$ 4,821,222
Chilean pesos [member] | Finance Lease [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	$ 57,266	$ 54,596
Chilean pesos [member] | Bottom of range [member] | Finance Lease [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	8.70%	8.70%	8.70%
Borrowings maturity	2021	2020
Chilean pesos [member] | Top of range [member] | Finance Lease [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	8.97%	8.97%	8.97%
Borrowings maturity	2027	2027
Other currencies [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	$ 6,590,154	$ 5,818,358
Peruvian Soles [Member] | Lines of credit [member]
Disclosure of detailed information about borrowings [line items]
Borrowings maturity	2021
Borrowings interest basis	1.200% - 1.450%
Borrowings	$ 17,094,079	$ 15,351,211
Peruvian Soles [Member] | Bottom of range [member] | Lines of credit [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate		3.55%
Borrowings maturity		2020
Peruvian Soles [Member] | Top of range [member] | Lines of credit [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate		3.70%
Borrowings maturity		2021

Debt - Additional Information (

Debt - Additional Information (Detail) € in Millions, $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2020USD ($)	Dec. 31, 2020EUR (€)
Disclosure of detailed information about borrowings [line items]
Weighted average cost of borrowed funds	3.72%	4.16%
Commercial paper	$ 40,940
Hybrid Notes [member]
Disclosure of detailed information about borrowings [line items]
Borrowings, maturity	2073
Revolving Syndicated Credit Facility One [member]
Disclosure of detailed information about borrowings [line items]
Loan amount			$ 2,000
Borrowings, maturity	2021
Revolving Syndicated Credit Facility Two [member]
Disclosure of detailed information about borrowings [line items]
Loan amount			$ 2,500
Borrowings, maturity	2024
Syndicated revolving credit facilities [member] | Telekom Austria [member] | Euros [member]
Disclosure of detailed information about borrowings [line items]
Loan amount | €				€ 1,000
Series One Hybrid Notes [member]
Disclosure of detailed information about borrowings [line items]
Loan amount | €				€ 550
Capital securities beginning redemption period	2023
Series Two Hybrid Notes [member]
Disclosure of detailed information about borrowings [line items]
Borrowings interest rate	6.375%		6.375%	6.375%
Hybrid Notes [member]
Disclosure of detailed information about borrowings [line items]
Percentage of leverage for equity credit	50.00%
Lines of credit [member]
Disclosure of detailed information about borrowings [line items]
Commercial paper	$ 53,062	$ 53,645
Lines of credit [member] | Euros [member]
Disclosure of detailed information about borrowings [line items]
Borrowings, maturity		2020
Borrowings interest rate		0.03%
Mexico [member]
Disclosure of detailed information about borrowings [line items]
Commissions or the reimbursements for Mexican tax withholdings	4.90%

Debt - Summary of Short Term De

Debt - Summary of Short Term Debt Maturities (Detail) $ in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2020USD ($)
Disclosure of detailed information about borrowings [line items]
Short-term debt	$ 148,083,184	$ 129,172,033	$ 7,423
Weighted average interest rate	2.23%	3.31%
Senior Notes 1 [member] | Obligations and senior notes [member]
Disclosure of detailed information about borrowings [line items]
Short-term debt	$ 95,007,014	$ 88,438,286
Lines of credit [member]
Disclosure of detailed information about borrowings [line items]
Short-term debt	53,062,260	40,722,004
Finance Lease [member]
Disclosure of detailed information about borrowings [line items]
Short-term debt	$ 13,910	$ 11,743

Debt - Summary of Long Term Deb

Debt - Summary of Long Term Debt Maturities (Detail) $ in Thousands, $ in Millions	Dec. 31, 2020MXN ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019MXN ($)
Disclosure of detailed information about borrowings [line items]
Long-term debt	$ 480,299,772	$ 24,077	$ 495,082,444
2022 [member]
Disclosure of detailed information about borrowings [line items]
Long-term debt	112,091,112
2023 [member]
Disclosure of detailed information about borrowings [line items]
Long-term debt	25,594,561
2024 [member]
Disclosure of detailed information about borrowings [line items]
Long-term debt	31,721,298
2025 and Thereafter [member]
Disclosure of detailed information about borrowings [line items]
Long-term debt	$ 310,892,801

Debt - Summary of Senior Notes

Debt - Summary of Senior Notes Outstanding (Detail) - MXN ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Disclosure of Senior Notes Outstanding [Line Items]
Borrowings	$ 628,382,956	$ 624,254,477
U.S. dollars [member]
Disclosure of Senior Notes Outstanding [Line Items]
Borrowings	186,531,417	169,142,643
Mexican pesos [member]
Disclosure of Senior Notes Outstanding [Line Items]
Borrowings	51,282,881	58,129,292
Euros [member]
Disclosure of Senior Notes Outstanding [Line Items]
Borrowings	224,928,934	222,190,375
Pound sterling [member]
Disclosure of Senior Notes Outstanding [Line Items]
Borrowings	59,993,720	54,962,779
Japanese yens [member]
Disclosure of Senior Notes Outstanding [Line Items]
Borrowings	2,511,701	2,255,663
Brazilian reais [member]
Disclosure of Senior Notes Outstanding [Line Items]
Borrowings	32,533,191	34,948,736
Chilean pesos [member]
Disclosure of Senior Notes Outstanding [Line Items]
Borrowings	4,078,453	3,562,695
Senior Notes 1 [member] | U.S. dollars [member]
Disclosure of Senior Notes Outstanding [Line Items]
Borrowings	186,531,417	169,142,643
Senior Notes 1 [member] | Mexican pesos [member]
Disclosure of Senior Notes Outstanding [Line Items]
Borrowings	51,282,881	58,129,292
Senior Notes 1 [member] | Euros [member]
Disclosure of Senior Notes Outstanding [Line Items]
Borrowings	183,988,456	222,190,375
Senior Notes 1 [member] | Pound sterling [member]
Disclosure of Senior Notes Outstanding [Line Items]
Borrowings	59,993,720	54,962,779
Senior Notes 1 [member] | Japanese yens [member]
Disclosure of Senior Notes Outstanding [Line Items]
Borrowings	2,511,701	2,255,663
Senior Notes 1 [member] | Brazilian reais [member]
Disclosure of Senior Notes Outstanding [Line Items]
Borrowings	32,533,191	34,948,736
Senior Notes 1 [member] | Chilean pesos [member]
Disclosure of Senior Notes Outstanding [Line Items]
Borrowings	$ 4,078,453	$ 3,562,695

Right of use assets and lease_3

Right of use assets and lease debt - Schedule of detailed information about right-of-use assets and lease liabilities (Detail) $ in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2020MXN ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019MXN ($)
Disclosure Right of use Assets and Lease liabilities [Line Items]
As of January 1	$ 118,003,223
As of January 1	118,003,223		$ 120,078,302
Additions and release	7,569,964		8,015,051
Business Combinations			9,668,507
Modifications	6,572,362		9,492,280
Depreciation	(28,371,085)		(23,593,566)
Translation adjustment	(1,797,620)		(5,657,351)
Balance at December 31	101,976,844	$ 5,112	118,003,223
Interest expense	9,134,288		7,940,240
Payments	(29,623,565)	$ (1,485)	(26,765,075)
Balance at December 31	109,327,241
Towers and sites [member]
Disclosure Right of use Assets and Lease liabilities [Line Items]
As of January 1	96,102,449		94,252,098
Additions and release	5,745,869		6,364,508
Business Combinations			9,668,507
Modifications	8,559,335		7,474,469
Depreciation	(22,064,413)		(17,286,497)
Translation adjustment	(3,124,365)		(4,370,636)
Balance at December 31	85,218,875		96,102,449
Property [member]
Disclosure Right of use Assets and Lease liabilities [Line Items]
As of January 1	17,439,370		21,075,884
Additions and release	309,576		921,542
Modifications	(3,035,831)		1,288,974
Depreciation	(3,440,428)		(4,941,222)
Translation adjustment	932,748		(905,808)
Balance at December 31	12,205,435		17,439,370
Office equipment [member]
Disclosure Right of use Assets and Lease liabilities [Line Items]
As of January 1	4,461,404		4,750,320
Additions and release	1,514,519		729,001
Modifications	1,048,858		728,837
Depreciation	(2,866,244)		(1,365,847)
Translation adjustment	393,997		(380,907)
Balance at December 31	4,552,534		4,461,404
Liability related to right-of-use of assets [member]
Disclosure Right of use Assets and Lease liabilities [Line Items]
As of January 1	120,596,733		119,387,660
Additions and release	4,833,959		7,437,621
Business Combinations			10,810,111
Modifications	7,769,326		8,363,045
Interest expense	9,134,288		7,940,240
Payments	(29,623,565)		(26,765,075)
Translation adjustment	(3,383,500)		(6,576,869)
Balance at December 31	$ 109,327,241		$ 120,596,733

Right-of-use assets and lease d

Right-of-use assets and lease debt - Additional Information (Detail) $ in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2020MXN ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019MXN ($)
Statement [line items]
Right of use assets	$ 101,976,844	$ 5,112	$ 118,003,223
Lease liabilities	109,327,241
Amendment of IFRS 16 [Member]
Statement [line items]
Adjustment to accrued lease liability	277,680
Related Party [Member]
Statement [line items]
Right of use assets	18,499,851		22,878,245
Lease liabilities	$ 20,016,478		$ 23,805,275

Right-of-use assets and lease_2

Right-of-use assets and lease debt - Summary of Long Term Debt Maturities (Detail) $ in Thousands, $ in Millions	Dec. 31, 2020MXN ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019MXN ($)
Disclosure of detailed information about borrowings [line items]
Long-term debt	$ 84,259,336	$ 4,224	$ 94,702,022
2022 [member]
Disclosure of detailed information about borrowings [line items]
Long-term debt	35,744,268
2023 [member]
Disclosure of detailed information about borrowings [line items]
Long-term debt	12,778,050
2024 [member]
Disclosure of detailed information about borrowings [line items]
Long-term debt	9,606,195
2025 and Thereafter [member]
Disclosure of detailed information about borrowings [line items]
Long-term debt	$ 26,130,823

Right of use assets and lease_4

Right of use assets and lease debt - Schedule of maturity of lease liabilities (Detail) $ in Thousands, $ in Millions	Dec. 31, 2020MXN ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019MXN ($)
Disclosure of maturity analysis of operating lease payments [line items]
Short term	$ 25,067,905	$ 1,257	$ 25,894,711
Long term	84,259,336	$ 4,224	$ 94,702,022
Total	$ 109,327,241

Right of use assets and lease_5

Right of use assets and lease debt - Summary of lease cost recognized expenses (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Statement [line items]
Depreciation expense of right-of-use assets	$ 28,371,085	$ 23,593,566
Interest expense on lease liabilities	9,134,288	7,940,240
Expense relating to short-term leases	32,238	1,980,361
Expense relating to leases of low-value assets	2,883	25,935
Variable lease payments	78,494	1,299,502
Total	37,618,988	34,839,604
Other [Member]
Statement [line items]
Depreciation expense of right-of-use assets	22,404,924	18,176,521
Interest expense on lease liabilities	7,081,693	5,654,721
Expense relating to short-term leases	32,238	1,978,403
Expense relating to leases of low-value assets	2,883	25,935
Variable lease payments	78,494	1,299,502
Total	29,600,232	27,135,082
Related Party [Member]
Statement [line items]
Depreciation expense of right-of-use assets	5,966,161	5,417,045
Interest expense on lease liabilities	2,052,595	2,285,519
Expense relating to short-term leases		1,958
Total	$ 8,018,756	$ 7,704,522

Accounts Payable, Accrued Lia_3

Accounts Payable, Accrued Liabilities and Asset Retirement Obligations - Components Account Payable and Accrued Liabilities (Detail) $ in Thousands, $ in Millions	Dec. 31, 2020MXN ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019MXN ($)
Accounts payable and accrued liabilities [abstract]
Suppliers	$ 74,285,881		$ 113,370,716
Sundry creditors	101,406,307		90,849,195
Interest payable	7,661,762		8,057,170
Guarantee deposits from customers	1,386,645		1,467,835
Dividends payable	2,254,877		2,367,908
Total	$ 186,995,472	$ 9,374	$ 216,112,824

Accounts Payable, Accrued Lia_4

Accounts Payable, Accrued Liabilities and Asset Retirement Obligations - Summary of Balance of Accrued Liabilities (Detail) $ in Thousands, $ in Millions	Dec. 31, 2020MXN ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019MXN ($)
Current liabilities
Direct employee benefits payable	$ 18,965,160		$ 17,991,283
Contingencies	31,326,691		34,379,969
Total	$ 50,291,851	$ 2,521	$ 52,371,252

Accounts Payable, Accrued Lia_5

Accounts Payable, Accrued Liabilities and Asset Retirement Obligations - Summary of Movements in Contingent Liabilities (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of contingent liabilities [abstract]
Beginning balance	$ 34,379,969	$ 40,281,573
Business combination	292	1,378,611
Effect of translation	(4,290,753)	(2,302,058)
Increase of the year	7,442,292	6,410,975
Applications payments	(3,214,407)	(5,483,327)
Applications reversals	(2,990,702)	(1,833,518)
Reclassification by adoption of IFRIC 23		(4,072,287)
Ending balance	$ 31,326,691	$ 34,379,969

Accounts Payable, Accrued Lia_6

Accounts Payable, Accrued Liabilities and Asset Retirement Obligations - Summary of Movements in Asset Retirement Obligations (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of asset retirement obligations [abstract]
Beginning balance	$ 15,816,744	$ 15,971,601
Business combination		293,548
Effect of translation	374,418	(1,339,033)
Increase of the year	2,412,908	1,600,197
Applications payments	(593,644)	(128,842)
Applications reversals	(122,435)	(580,727)
Ending balance	$ 17,887,991	$ 15,816,744

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) R$ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2019BRL (R$)	Dec. 31, 2018MXN ($)	Dec. 31, 2014MXN ($)	Dec. 31, 2020BRL (R$)	Dec. 31, 2012MXN ($)
Disclosure of commitments and contingencies [line items]
Fine imposed on sanction procedure initiated by triggered breach				$ 2,543,937
Monetary correction in a total amount of regulatory matters		$ 15,738,670	R$ 4100000
Value Added Tax [Member]
Disclosure of commitments and contingencies [line items]
Tax contingencies amount	$ 41,974,641					R$ 10934598
Provision for taxes other than income tax [member] | Value Added Tax [Member]
Disclosure of commitments and contingencies [line items]
Provision	3,101,862					808,050
Provision for taxes other than income tax [member] | Social Contribution [Member]
Disclosure of commitments and contingencies [line items]
Provision	3,319,251					864,681
Provision for taxes other than income tax [member] | Social Integration Program [Member]
Disclosure of commitments and contingencies [line items]
Provision	4,993,865					1,300,926
Provision for taxes other than income tax [member] | Allegedly Improper Exclusion [Member]
Disclosure of commitments and contingencies [line items]
Provision	1,428,756					372,198
Provision for taxes other than income tax [member] | Alleged Underpayment Of Obligations [Member]
Disclosure of commitments and contingencies [line items]
Provision	656					171
Provision for taxes other than income tax [member] | Alleged Nonpayment Of Services Tax [Member]
Disclosure of commitments and contingencies [line items]
Provision	46,947					12,230
Provision for taxes other than income tax [member] | Alleged Underpayment Of IRRF and CIDE Taxes And Remittances To Foreign Operators [Member]
Disclosure of commitments and contingencies [line items]
Provision	108,877					28,363
Provision for taxes other than income tax [member] | Contribute To The Promotion Of Public Radio Broadcasting [Member]
Disclosure of commitments and contingencies [line items]
Provision	$ 3,826,631					996,856
Agencia Nacional de telecomunicacoes [member]
Disclosure of commitments and contingencies [line items]
Inflation-related adjustments applicable to percentage of concessions price	60.00%
Related matters [member] | Provision for taxes other than income tax [member]
Disclosure of commitments and contingencies [line items]
Provision	$ 17,643,740					4,596,280
Tax contingent liability [member] | Social Contribution [Member]
Disclosure of commitments and contingencies [line items]
Tax contingencies amount	20,151,371					5,249,530
Tax contingent liability [member] | Social Integration Program [Member]
Disclosure of commitments and contingencies [line items]
Tax contingencies amount	14,991,233					3,905,289
Tax contingent liability [member] | Allegedly Improper Exclusion [Member]
Disclosure of commitments and contingencies [line items]
Tax contingencies amount	11,476,895					2,989,787
Tax contingent liability [member] | Alleged Underpayment Of Obligations [Member]
Disclosure of commitments and contingencies [line items]
Tax contingencies amount	4,410,628					1,148,990
Tax contingent liability [member] | Alleged Nonpayment Of Services Tax [Member]
Disclosure of commitments and contingencies [line items]
Tax contingencies amount	1,688,790					439,938
Tax contingent liability [member] | Alleged Underpayment Of IRRF and CIDE Taxes And Remittances To Foreign Operators [Member]
Disclosure of commitments and contingencies [line items]
Tax contingencies amount	4,183,953					1,089,940
Tax contingent liability [member] | Contribute To The Promotion Of Public Radio Broadcasting [Member]
Disclosure of commitments and contingencies [line items]
Tax contingencies amount	3,848,354					1,002,515
Tax contingent liability [member] | Related matters [member]
Disclosure of commitments and contingencies [line items]
Tax contingencies amount	119,231,362					31,060,349
Contingent liabilities [member] | TFI [member]
Disclosure of commitments and contingencies [line items]
Tax contingencies amount	12,921,410					3,366,090
Provision for Monetary correction in a total amount of regulatory matters [member]
Disclosure of commitments and contingencies [line items]
Provision	$ 2,625,671					R$ 684000
Mexican tax administration service [member] | Previous IFRS [member]
Disclosure of commitments and contingencies [line items]
Consolidated tax loss					$ 8,556,000
Mexican tax administration service [member] | Tax contingent liability [member]
Disclosure of commitments and contingencies [line items]
Tax assessment related to tax return					$ 529,700
Mexican tax administration service [member] | Tax contingent liability [member] | America Central Tel, S.A de C.V [member]
Disclosure of commitments and contingencies [line items]
Tax assessment for alleged tax improprieties							$ 1,400,000

Commitments and Contingencies_2

Commitments and Contingencies - Schedule of Purchase Commitments (Detail) - Wireless carriers [member] - Purchase commitment for purchase of airtime minutes at current market prices [member] $ in Thousands	Dec. 31, 2020MXN ($)
Disclosure of commitments [line items]
Purchase commitments	$ 127,588,218
2021 [member]
Disclosure of commitments [line items]
Purchase commitments	74,446,526
2022 [member]
Disclosure of commitments [line items]
Purchase commitments	37,345,449
2023 [member]
Disclosure of commitments [line items]
Purchase commitments	2,240,297
2024 and thereafter [member]
Disclosure of commitments [line items]
Purchase commitments	$ 13,555,946

Employee Benefits - Analysis of

Employee Benefits - Analysis of Net Liability and Net Period Cost for Employee Benefit (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of net defined benefit liability (asset) [line items]
Liabilities	$ 168,230,202	$ 152,507,058
Net period cost (benefit)
Net period cost (benefit)	18,085,954	16,609,565	$ 13,989,100
Mexico [member]
Disclosure of net defined benefit liability (asset) [line items]
Liabilities	129,260,355	116,537,660
Net period cost (benefit)
Net period cost (benefit)	14,911,208	12,788,464	12,046,208
Puerto Rico [member]
Disclosure of net defined benefit liability (asset) [line items]
Liabilities	14,924,874	13,228,592
Net period cost (benefit)
Net period cost (benefit)	664,046	747,755	686,067
Europe [member]
Disclosure of net defined benefit liability (asset) [line items]
Liabilities	14,392,445	12,827,318
Net period cost (benefit)
Net period cost (benefit)	1,701,424	2,526,957	619,039
Brazil [member]
Disclosure of net defined benefit liability (asset) [line items]
Liabilities	8,913,548	9,503,738
Net period cost (benefit)
Net period cost (benefit)	722,412	511,964	579,432
Ecuador [member]
Disclosure of net defined benefit liability (asset) [line items]
Liabilities	488,161	409,750
Net period cost (benefit)
Net period cost (benefit)	67,402	$ 34,425	$ 58,354
El Salvador [member]
Disclosure of net defined benefit liability (asset) [line items]
Liabilities	154,422
Net period cost (benefit)
Net period cost (benefit)	15,751
Nicaragua [member]
Disclosure of net defined benefit liability (asset) [line items]
Liabilities	61,337
Net period cost (benefit)
Net period cost (benefit)	3,711
Honduras [member]
Disclosure of net defined benefit liability (asset) [line items]
Liabilities	$ 35,060

Employee Benefits - Summary of

Employee Benefits - Summary of Defined Benefit Obligation (DBO) and Plan Assets for Pension and Other Benefit Obligation Plans (Detail) - MXN ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of defined benefit plans [line items]
Defined benefit obligation and plan assets	$ (154,847,297)	$ (140,696,974)	$ (108,118,868)	$ (107,944,581)
Reportable segments [member]
Disclosure of defined benefit plans [line items]
Defined benefit obligation and plan assets	154,578,357	140,483,909
Reportable segments [member] | Mexico [member]
Disclosure of defined benefit plans [line items]
Defined benefit obligation and plan assets	128,343,821	115,691,830
Reportable segments [member] | Puerto Rico [member]
Disclosure of defined benefit plans [line items]
Defined benefit obligation and plan assets	14,924,874	13,228,592
Reportable segments [member] | Brazil [member]
Disclosure of defined benefit plans [line items]
Defined benefit obligation and plan assets	5,818,789	7,024,944
Reportable segments [member] | Europe [member]
Disclosure of defined benefit plans [line items]
Defined benefit obligation and plan assets	5,490,873	4,538,543
Defined benefit obligation [member]
Disclosure of defined benefit plans [line items]
Defined benefit obligation and plan assets	(343,003,240)	(342,569,774)	(306,702,447)	(329,113,625)
Defined benefit obligation [member] | Reportable segments [member]
Disclosure of defined benefit plans [line items]
Defined benefit obligation and plan assets	342,734,300	342,356,709
Defined benefit obligation [member] | Reportable segments [member] | Mexico [member]
Disclosure of defined benefit plans [line items]
Defined benefit obligation and plan assets	278,434,302	280,602,176
Defined benefit obligation [member] | Reportable segments [member] | Puerto Rico [member]
Disclosure of defined benefit plans [line items]
Defined benefit obligation and plan assets	40,240,193	35,803,893
Defined benefit obligation [member] | Reportable segments [member] | Brazil [member]
Disclosure of defined benefit plans [line items]
Defined benefit obligation and plan assets	18,568,932	21,412,097
Defined benefit obligation [member] | Reportable segments [member] | Europe [member]
Disclosure of defined benefit plans [line items]
Defined benefit obligation and plan assets	5,490,873	4,538,543
Plan assets [member]
Disclosure of defined benefit plans [line items]
Defined benefit obligation and plan assets	191,549,583	206,300,821	203,671,122	227,688,604
Plan assets [member] | Reportable segments [member]
Disclosure of defined benefit plans [line items]
Defined benefit obligation and plan assets	(191,549,583)	(206,300,821)
Plan assets [member] | Reportable segments [member] | Mexico [member]
Disclosure of defined benefit plans [line items]
Defined benefit obligation and plan assets	(150,090,481)	(164,910,346)
Plan assets [member] | Reportable segments [member] | Puerto Rico [member]
Disclosure of defined benefit plans [line items]
Defined benefit obligation and plan assets	(25,315,319)	(22,575,301)
Plan assets [member] | Reportable segments [member] | Brazil [member]
Disclosure of defined benefit plans [line items]
Defined benefit obligation and plan assets	(16,143,783)	(18,815,174)
Effect of asset celling [member]
Disclosure of defined benefit plans [line items]
Defined benefit obligation and plan assets	(3,393,640)	(4,428,021)	$ (5,087,543)	$ (6,519,560)
Effect of asset celling [member] | Reportable segments [member]
Disclosure of defined benefit plans [line items]
Defined benefit obligation and plan assets	3,393,640	4,428,021
Effect of asset celling [member] | Reportable segments [member] | Brazil [member]
Disclosure of defined benefit plans [line items]
Defined benefit obligation and plan assets	$ 3,393,640	$ 4,428,021

Employee Benefits - Summary o_2

Employee Benefits - Summary of the Actuarial Results Generated for the Pension and Retirement Plans as well as the Medical Services (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of actuarial results generated for the pension and retirement plans [line items]
Balance at the beginning of the year	$ 140,696,974	$ 108,118,868	$ 107,944,581
Current service cost	2,810,584	2,591,975	3,322,813
Interest cost on projected benefit obligation	30,482,173	31,001,348	30,185,257
Expected return on plan assets	17,655,119	(20,070,037)	(20,804,104)
Changes in the asset ceiling during the period and others	278,639	445,743	587,373
Past service costs and other	148,253	144,481	157,765
Actuarial gain for changes in experience	(8,945)	(22,599)	(7,222)
Actuarial loss/(gain) from changes in demographic assumptions	(103,987)		134,625
Actuarial (gain) loss from changes in financial assumptions	20,219	36,163	(24,890)
Net period cost	16,075,534	14,126,945	13,551,617
Actuarial gain for changes in experience	(9,677)	(129)	(21,283,470)
Actuarial gain from changes in demographic assumptions	(270)	(339,657)	(1,246,539)
Actuarial loss from changes in demographic assumptions	3,475,345	31,606,323	68,482
Actuarial loss from changes in financial assumptions	(924,084)	7,207,072
Changes in the asset ceiling during the period and others	(542,430)	(712,064)	(1,055,409)
Return on plan assets greater than discount rate (shortfall)	12,320,777	423,514	23,503,296
Recognized in other comprehensive income	14,215,944	38,185,188	(13,640)
Contributions to the pension plan made by the Company	(1,882,654)	(1,337,610)	(1,565,792)
Payments to employees	(14,426,720)	(16,996,920)	(10,651,938)
Effect of translation	168,219	(1,399,497)	(1,145,960)
Others	(16,141,155)	(19,734,027)	(13,363,690)
Balance at the end of the year	154,847,297	140,696,974	108,118,868
Less short-term portion	(268,940)	(213,065)	(212,141)
Non-current obligation	154,578,357	140,483,909	107,906,727
Defined benefit obligation [member]
Disclosure of actuarial results generated for the pension and retirement plans [line items]
Balance at the beginning of the year	342,569,774	306,702,447	329,113,625
Current service cost	2,810,584	2,591,975	3,322,813
Interest cost on projected benefit obligation	30,482,173	31,001,348	30,185,257
Actuarial gain for changes in experience	(8,945)	(22,599)	(7,222)
Actuarial loss/(gain) from changes in demographic assumptions	(103,987)		134,625
Actuarial (gain) loss from changes in financial assumptions	20,219	36,163	(24,890)
Net period cost	33,303,761	33,606,758	33,610,583
Actuarial gain for changes in experience	(9,677)	(129)	(21,283,470)
Actuarial gain from changes in demographic assumptions	(270)	(339,657)	(1,246,539)
Actuarial loss from changes in demographic assumptions	3,475,345	31,606,323	68,482
Actuarial loss from changes in financial assumptions	(924,084)	7,207,072
Recognized in other comprehensive income	2,437,597	38,473,738	(22,461,527)
Contributions made by plan participants	137,947	155,188	173,722
Benefits paid	(19,740,727)	(15,836,928)	(19,546,541)
Payments to employees	(14,426,720)	(16,996,920)	(10,651,938)
Effect of translation	(1,278,392)	(3,534,509)	(3,535,477)
Others	(35,307,892)	(36,213,169)	(33,560,234)
Balance at the end of the year	343,003,240	342,569,774	306,702,447
Less short-term portion	(268,940)	(213,065)	(212,141)
Non-current obligation	342,734,300	342,356,709	306,490,306
Plan assets [member]
Disclosure of actuarial results generated for the pension and retirement plans [line items]
Balance at the beginning of the year	(206,300,821)	(203,671,122)	(227,688,604)
Expected return on plan assets	(17,655,119)	(20,070,037)	(20,804,104)
Past service costs and other	148,253	144,481	157,765
Net period cost	(17,506,866)	(19,925,556)	(20,646,339)
Return on plan assets greater than discount rate (shortfall)	12,320,777	423,514	23,503,296
Recognized in other comprehensive income	12,320,777	423,514	23,503,296
Contributions made by plan participants	(137,947)	(155,188)	(173,722)
Contributions to the pension plan made by the Company	(1,882,654)	(1,337,610)	(1,565,792)
Benefits paid	19,740,727	15,836,928	19,546,541
Effect of translation	2,217,201	2,528,213	3,353,498
Others	19,937,327	16,872,343	21,160,525
Balance at the end of the year	(191,549,583)	(206,300,821)	(203,671,122)
Non-current obligation	(191,549,583)	(206,300,821)	(203,671,122)
Effect of asset celling [member]
Disclosure of actuarial results generated for the pension and retirement plans [line items]
Balance at the beginning of the year	4,428,021	5,087,543	6,519,560
Changes in the asset ceiling during the period and others	278,639	445,743	587,373
Net period cost	278,639	445,743	587,373
Changes in the asset ceiling during the period and others	(542,430)	(712,064)	(1,055,409)
Recognized in other comprehensive income	(542,430)	(712,064)	(1,055,409)
Effect of translation	(770,590)	(393,201)	(963,981)
Others	(770,590)	(393,201)	(963,981)
Balance at the end of the year	3,393,640	4,428,021	5,087,543
Non-current obligation	$ 3,393,640	$ 4,428,021	$ 5,087,543

Employee Benefits - Additional

Employee Benefits - Additional Information (Detail) - MXN ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of defined benefit plans [line items]
Current service cost	$ 2,810,584,000	$ 2,591,975,000	$ 3,322,813,000
Expected return on plan assets	(17,655,119,000)	20,070,037,000	20,804,104,000
Net pension plan liability and plan assets	$ (154,847,297,000)	(140,696,974,000)	(108,118,868,000)	$ (107,944,581,000)
Severance benefit obligations, description	Severance benefit obligations for employees hired before January 1, 2003, excluding civil servants, are covered by defined benefit plans. Upon termination by A1 Telekom Austria Group or retirement, eligible employees receive severance payments. Depending on their time in service, their severance is equal to a multiple of their monthly basic compensation plus variable elements such as overtime or bonuses, with a maximum of twelve monthly salaries. In case of death, the heirs of eligible employees receive 50% of the severance benefits. The primary risks to A1 Telekom Austria Group are salary increases and changes of interest rates.
Severance benefits, in case of death	50.00%
Net period cost (benefit)	$ 18,085,954,000	$ 16,609,565,000	$ 13,989,100,000
Akenes [member]
Disclosure of defined benefit plans [line items]
Defined Benefit Plan, Pension Benefit Obligation, Percentage	10.00%	10.00%
Telekom Austria [member]
Disclosure of defined benefit plans [line items]
Defined benefits plan, eligibility retirement date	Jan. 1, 1975
Telekom Austria [member] | Defined Contribution Plans [member]
Disclosure of defined benefit plans [line items]
Annual expense of defined contribution plan	$ 295,567,000	$ 281,693
Telekom Austria [member] | Unfunded Pension Plans [member]
Disclosure of defined benefit plans [line items]
Benefit determination maximum percentage on salary before retirement	80.00%
Telmexs [member]
Disclosure of defined benefit plans [line items]
Net pension plan liability and plan assets	$ 150,090,481,000	$ 164,910,346,000
Rate of equity instruments		31.90%
Rate of debt instruments	39.60%
Recorded of pension plan re-measurement value in defined pension plan	$ 11,753,416,000	$ 34,782,129,000
Increase in fair value of related party pension plan investments	$ 14,820,220,000	4,156,919,000
Plan description	Part of the Telmex's employees are covered under defined benefit pension plans and seniority premiums. Pension benefits and seniority premiums are determined on the basis of compensation received by the employees in their final year of employment, their seniority, and their age at the time of retirement. Telmex has set up an irrevocable trust fund to finance these employee benefits and has adopted the policy of making contributions to such fund when it is considered necessary.
Top of range [member] | Telekom Austria [member] | Defined Contribution Plans [member]
Disclosure of defined benefit plans [line items]
Percentage of defined contribution plan	5.00%
Austria [member]
Disclosure of defined benefit plans [line items]
Service award description	Civil servants and certain employees (in the following “employees”) are eligible to receive service awards. In accordance with the legal regulations, eligible employees receive a cash bonus of two months’ salary after 25 years of service and four months’ salary after 40 years of service. Employees with at least 35 years of service when retiring (at the age of 65) or who are retiring based on specific legal regulations are also eligible to receive the service award of four monthly salaries. The obligation is accrued over the period of service, taking into account the employee turnover rate of employees who leave service early. The main risk that A1 Telekom Austria Group is exposed to is the risk of development of salary increases and changes of interest rates.
Service period to receive bonus, description	after 25 years
Service period to receive bonus, description	after 40 years
Contributions to social security, net of the share contributed by civil servants	$ 1,474,721,000	1,334,713,000
Contributions to the government, net of the share contributed by civil servants	601,476,000	530,888,000
Austria [member] | Defined Contribution Plans [member]
Disclosure of defined benefit plans [line items]
DCP liability	134,034,000	111,724,000
Austria [member] | Telekom Austria [member]
Disclosure of defined benefit plans [line items]
Percentage of contribution to social security			12.55%
Austria [member] | Telekom Austria [member] | Defined Contribution Plans [member]
Disclosure of defined benefit plans [line items]
Defined contribution plan, payment	$ 66,294,000	54,945,000
Austria [member] | Bottom of range [member]
Disclosure of defined benefit plans [line items]
Service period to receive bonus, description	35 years of service when retiring (at the age of 65)
Percentage of contribution to active civil servants	7.00%
Austria [member] | Top of range [member]
Disclosure of defined benefit plans [line items]
Percentage of contribution to active civil servants	29.00%
Brazil [member]
Disclosure of defined benefit plans [line items]
Current service cost	$ 268,562,000	99,498,000	$ 98,658,000
Employee benefits	2,111,801,000	2,402,285,000
Cost of labor	2,930,000	3,365,000	2,377,000
Net period cost (benefit)	722,412,000	511,964,000	579,432,000
Employee benefits	2,111,801,000	2,402,285,000
Brazil [member] | Claro Brasil [member] | Defined Contribution Plans [member]
Disclosure of defined benefit plans [line items]
DCP liability	$ 980,014,000	76,509,000
Brazil [member] | Bottom of range [member] | Claro Brasil [member] | Participants enrolled before October 31st, 2014 [member]
Disclosure of defined benefit plans [line items]
Employee contributions to the plan	1.00%
Brazil [member] | Bottom of range [member] | Claro Brasil [member] | Participants enrolled after October 31st, 2014 [member]
Disclosure of defined benefit plans [line items]
Employee contributions to the plan	1.00%
Brazil [member] | Top of range [member] | Claro Brasil [member]
Disclosure of defined benefit plans [line items]
Employer contributions to the plan	8.00%
Brazil [member] | Top of range [member] | Claro Brasil [member] | Participants enrolled before October 31st, 2014 [member]
Disclosure of defined benefit plans [line items]
Employee contributions to the plan	8.00%
Brazil [member] | Top of range [member] | Claro Brasil [member] | Participants enrolled after October 31st, 2014 [member]
Disclosure of defined benefit plans [line items]
Employee contributions to the plan	7.00%
Mexico [member]
Disclosure of defined benefit plans [line items]
Current service cost		49,050,000	16,347,000
Expected return on plan assets	$ 174,994,000
Employee benefits	916,534,000	845,830,000
Net period cost (benefit)	14,911,208,000	12,788,464,000	12,046,208,000
Ecuador [member]
Disclosure of defined benefit plans [line items]
Current service cost	67,402,000	34,425,000	58,354,000
Employee benefits	488,161,000	409,750,000
Net period cost (benefit)	67,402,000	34,425,000	$ 58,354,000
Employee benefits	488,161,000	$ 409,750,000
Central America [Member]
Disclosure of defined benefit plans [line items]
Employee benefits	250,819,000
Net period cost (benefit)	19,462,000
Employee benefits	$ 250,819,000

Employee Benefits - Schedule of

Employee Benefits - Schedule of Plan Assets Invested (Detail)	Dec. 31, 2020	Dec. 31, 2019
Puerto Rico [member]
Disclosure of fair value of plan assets [line items]
Equity instruments	43.00%	41.00%
Debt instruments	22.00%	58.00%
Others	35.00%	1.00%
Total	100.00%	100.00%
Brazil [member]
Disclosure of fair value of plan assets [line items]
Debt instruments	95.00%	94.00%
Others	5.00%	6.00%
Total	100.00%	100.00%
Mexico [member]
Disclosure of fair value of plan assets [line items]
Equity instruments	68.00%	64.00%
Debt instruments	32.00%	36.00%
Total	100.00%	100.00%

Employee Benefits - Summary o_3

Employee Benefits - Summary of Assumptions Used in Determining the Net Period Cost (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Puerto Rico [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Discount rate and long-term rate return	2.34%	3.23%	4.45%
Rate of future salary increases	2.75%	2.75%	2.75%
Percentage of increase in health care costs for the coming year	2.28%	3.18%	3.87%
Brazil [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Discount rate and long-term rate return		7.03%	9.10%
Rate of future salary increases	3.25%	3.80%	4.00%
Percentage of increase in health care costs for the coming year	9.96%	10.30%	10.50%
Year to which this level will be maintained	2031	2029	2029
Brazil [member] | Bottom of range [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Discount rate and long-term rate return	6.48%
Brazil [member] | Top of range [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Discount rate and long-term rate return	7.39%
Mexico [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Discount rate and long-term rate return	10.04%	10.50%	11.81%
Rate of future salary increases	2.84%	3.20%	3.55%
Europe [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Rate of increase of pensions	1.60%	1.60%	1.60%
Europe [member] | Bottom of range [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Employee turnover rate	0.00%	0.00%	0.00%
Europe [member] | Top of range [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Employee turnover rate	1.31%	1.38%	1.51%
Europe [member] | Actuarial assumption rate one [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Discount rate and long-term rate return	0.25%	0.75%	1.25%
Rate of future salary increases	3.00%	3.00%	3.00%
Europe [member] | Actuarial assumption rate two [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Discount rate and long-term rate return	0.50%	1.00%	1.75%
Rate of future salary increases	3.50%	3.50%	3.50%
Europe [member] | Actuarial assumption rate three [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Discount rate and long-term rate return	0.75%	1.25%	2.00%
Rate of future salary increases	4.10%	4.40%	4.40%

Employee Benefits - Summary o_4

Employee Benefits - Summary of Increase (Decrease) Would Have Resulted in the DBO Pension and Other Benefits (Detail) $ in Thousands	Dec. 31, 2020MXN ($)
-100 [member] | Discount rate [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
DBO pension and other benefits	$ 29,012,552
-100 [member] | Health care cost trend rate [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
DBO pension and other benefits	(665,934)
+100 [member] | Discount rate [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
DBO pension and other benefits	(25,541,956)
+100 [member] | Health care cost trend rate [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
DBO pension and other benefits	$ 781,238

Employee Benefits - Summary o_5

Employee Benefits - Summary of Long-Term Direct Employee Benefits (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of long term direct employee benefits [abstract]
Beginning balance	$ 8,175,767	$ 8,111,778
Effect of translation	1,256,880	(518,180)
Increase of the year	1,729,392	2,528,224
Applications, Payments	(2,411,436)	(1,946,055)
Ending balance	$ 8,750,603	$ 8,175,767

Financial Assets and Liabilit_3

Financial Assets and Liabilities - Summary of Categorization of Financial Instruments, Excluding Cash and Cash Equivalents (Detail) - MXN ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financial Assets:
Financial Assets	$ 374,266,941	$ 260,844,606
Financial Liabilities:
Financial Liabilities	837,915,964	813,864,161
Loans and receivables [member]
Financial Assets:
Financial Assets	177,207,999	207,635,765
Loans and receivables [member] | Related parties [member]
Financial Assets:
Financial Assets	1,391,300	1,273,140
Fair value through profit or loss [member]
Financial Assets:
Financial Assets	20,928,335	6,825,760
Fair value through OCI [member]
Financial Assets:
Financial Assets	50,033,111	37,572,410
Equity investments at fair value through OCI and other short term investments [member]
Financial Assets:
Financial Assets	54,636,395	47,718,025
Equity investments at fair value through OCI and other short term investments [member] | Loans and receivables [member]
Financial Assets:
Financial Assets	4,603,284	10,145,615
Equity investments at fair value through OCI and other short term investments [member] | Fair value through OCI [member]
Financial Assets:
Financial Assets	50,033,111	37,572,410
Accounts receivable from subscribers distributors contractual assets and other net [member] | Loans and receivables [member]
Financial Assets:
Financial Assets	171,213,415	196,217,010
Financial instruments, class [member]
Financial Liabilities:
Financial Liabilities	14,230,249	9,596,751
Financial instruments, class [member] | Fair value through profit or loss [member]
Financial Assets:
Financial Assets	20,928,335	6,825,760
Liability Related to Right of Use of Assets [Member]
Financial Liabilities:
Financial Liabilities	109,327,241	120,596,733
Liability Related to Right of Use of Assets [Member] | Loans and receivables [member]
Financial Liabilities:
Financial Liabilities	109,327,241	120,596,733
Loans and receivables [member]
Financial Liabilities:
Financial Liabilities	928,705,585	964,424,453
Loans and receivables [member] | Related parties [member]
Financial Liabilities:
Financial Liabilities	3,999,916	3,460,419
Loans and receivables [member] | Debt [Member]
Financial Liabilities:
Financial Liabilities	628,382,956	624,254,477
Loans and receivables [member] | Accounts payable [Member]
Financial Liabilities:
Financial Liabilities	186,995,472	216,112,824
Fair value through profit or loss [Member]
Financial Liabilities:
Financial Liabilities	14,230,249	9,596,751
Fair value through profit or loss [Member] | Financial instruments, class [member]
Financial Liabilities:
Financial Liabilities	$ 14,230,249	$ 9,596,751

Financial Assets and Liabilit_4

Financial Assets and Liabilities - Summary of Fair Value for Financial Assets (Excluding Cash and Cash Equivalents) and Financial Liabilities (Detail) - MXN ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets:
Financial Assets	$ 374,266,941	$ 260,844,606
Liabilities:
Financial Liabilities	837,915,964	813,864,161
Debt [member]
Liabilities:
Financial Liabilities	714,358,474	683,670,677
Financial instruments, class [member]
Liabilities:
Financial Liabilities	14,230,249	9,596,751
Equity investments at fair value through OCI and other short term investments [member]
Assets:
Financial Assets	54,636,395	47,718,025
Pension plan assets [member]
Assets:
Financial Assets	191,549,583	206,300,821
Derivative Financial Instruments [Member]
Assets:
Financial Assets	20,928,335	6,825,760
Liability Related to Right of Use of Assets [Member]
Liabilities:
Financial Liabilities	109,327,241	120,596,733
Revalued Of Assets [Member]
Assets:
Financial Assets	107,152,628
Level 1 [member]
Assets:
Financial Assets	218,972,202	223,554,271
Liabilities:
Financial Liabilities	688,039,803	702,599,989
Level 1 [member] | Debt [member]
Liabilities:
Financial Liabilities	578,712,562	582,003,256
Level 1 [member] | Equity investments at fair value through OCI and other short term investments [member]
Assets:
Financial Assets	50,033,111	37,572,410
Level 1 [member] | Pension plan assets [member]
Assets:
Financial Assets	168,939,091	185,981,861
Level 1 [member] | Liability Related to Right of Use of Assets [Member]
Liabilities:
Financial Liabilities	109,327,241	120,596,733
Level 2 [member]
Assets:
Financial Assets	48,121,011	37,265,932
Liabilities:
Financial Liabilities	149,876,161	111,264,172
Level 2 [member] | Debt [member]
Liabilities:
Financial Liabilities	135,645,912	101,667,421
Level 2 [member] | Financial instruments, class [member]
Liabilities:
Financial Liabilities	14,230,249	9,596,751
Level 2 [member] | Equity investments at fair value through OCI and other short term investments [member]
Assets:
Financial Assets	4,603,284	10,145,615
Level 2 [member] | Pension plan assets [member]
Assets:
Financial Assets	22,589,392	20,294,557
Level 2 [member] | Derivative Financial Instruments [Member]
Assets:
Financial Assets	20,928,335	6,825,760
Level 3 [member]
Assets:
Financial Assets	107,173,728	24,403
Level 3 [member] | Pension plan assets [member]
Assets:
Financial Assets	21,100	$ 24,403
Level 3 [member] | Revalued Of Assets [Member]
Assets:
Financial Assets	$ 107,152,628

Financial Assets and Liabilit_5

Financial Assets and Liabilities - Additional Information (Detail) - Level 2 [member] - MXN ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]
Net realized gains (losses) related to derivative financial instruments	$ 2,606,938,000	$ (1,774,932,000)
Transfers out of Level 1 into Level 2 of fair value hierarchy	$ 0	$ 0

Financial Assets and Liabilit_6

Financial Assets and Liabilities - Summary of changes in liabilities arising from financing activities (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning balance	$ 744,851,210	$ 638,922,453
Beginning balance		119,387,660
Cash flow	(82,715,366)	(18,491,635)
Foreign currency exchange and other	75,574,353	5,032,732
Ending balance	737,710,197	744,851,210
Debt [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning balance	624,254,477	638,922,453
Cash flow	(53,091,801)	8,273,440
Foreign currency exchange and other	57,220,280	(22,941,416)
Ending balance	628,382,956	624,254,477
Liability Related to Right of Use of Assets [Member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning balance	120,596,733
Beginning balance		119,387,660
Cash flow	(29,623,565)	(26,765,075)
Foreign currency exchange and other	18,354,073	27,974,148
Ending balance	$ 109,327,241	$ 120,596,733

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Detail) - MXN ($) $ / shares in Units, $ in Thousands	Apr. 24, 2020	Apr. 09, 2019	Apr. 24, 2019	Dec. 31, 2020	Dec. 31, 2019
Disclosure of classes of share capital [line items]
Capital requirements				$ 270,049
Number of shares issued				71,063,212,170
Number of shares outstanding				66,862,560,649	66,004,214,830
Number of treasury shares held				4,200,651,521	5,058,997,340
Merger transaction description				any transaction representing 20% or more of the Company’s consolidated assets
Legal reserve				$ 358,440	$ 358,440
Amount of Mexican withholding tax				10.00%
Bottom of range [member] | Legal reserve [member]
Disclosure of classes of share capital [line items]
Increase in legal reserve				5.00%
Top of range [member] | Legal reserve [member]
Disclosure of classes of share capital [line items]
Increase in legal reserve				20.00%
Capital Stock Class AA Voting Rights [member]
Disclosure of classes of share capital [line items]
Number of shares issued				20,578,173,274
Capital Stock Class A Voting Rights [member]
Disclosure of classes of share capital [line items]
Number of shares issued				519,948,436
Capital Stock Class L Limited Voting Rights [member]
Disclosure of classes of share capital [line items]
Number of shares issued				49,965,090,460
Capital Stock Class Aa [member]
Disclosure of classes of share capital [line items]
Number of shares outstanding				20,578,173,274	20,601,632,660
Dividends paid	$ 0.38	$ 0.35
Capital Stock Class Aa [member] | Bottom of range [member]
Disclosure of classes of share capital [line items]
Percentage of capital stock				20.00%
Capital Stock Class Aa [member] | Top of range [member]
Disclosure of classes of share capital [line items]
Percentage of capital stock				51.00%
Capital Stock Class A [member]
Disclosure of classes of share capital [line items]
Number of shares outstanding				519,926,536	530,563,378
Dividends paid	0.38	0.35
Capital Stock Class A [member] | Bottom of range [member]
Disclosure of classes of share capital [line items]
Percentage of capital stock				19.60%
Capital Stock Class A [member] | Top of range [member]
Disclosure of classes of share capital [line items]
Percentage of capital stock				49.00%
Capital Stock Class L [member]
Disclosure of classes of share capital [line items]
Number of shares outstanding				45,764,460,839	44,872,018,792
Number of treasury shares held				4,200,629,621	5,058,975,440
Periodic payment of dividend		0.18	$ 0.19
Capital Stock Class L [member] | Top of range [member]
Disclosure of classes of share capital [line items]
Percentage of capital stock				80.00%
Class L [member]
Disclosure of classes of share capital [line items]
Dividends paid	$ 0.38	0.35
Periodic payment of dividend		$ 0.17
Periodic payable date of dividend	July 20 and November 09, 2020
Class A [member]
Disclosure of classes of share capital [line items]
Number of treasury shares held				21,900	21,900

Shareholders Equity - Summary o

Shareholders Equity - Summary of Computation of Basic and Diluted Earnings per Share (Detail) $ / shares in Units, $ in Thousands, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020MXN ($)$ / sharesshares	Dec. 31, 2020USD ($)shares	Dec. 31, 2019MXN ($)$ / sharesshares	Dec. 31, 2018MXN ($)$ / sharesshares
Earnings per share [abstract]
Net profit for the period attributable to equity holders of the parent	$ 46,852,605	$ 2,349	$ 67,730,891	$ 52,566,197
Weighted average shares (in millions) | shares	66,265	66,265	66,016	66,055
Earnings per share attributable to equity holders of the parent | $ / shares	$ 0.71		$ 1.03	$ 0.79

Components of Other Comprehen_3

Components of Other Comprehensive Loss - Summary of Movement on Components of Other Comprehensive Loss (Detail) $ in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2020MXN ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)
Controlling interest:
Unrealized (loss) gain on equity investments at fair value, net of deferred taxes	$ (1,952,414)	$ (98)	$ 883,408	$ (3,765,688)
Translation effect of foreign entities	(11,515,297)		(35,536,252)	(64,314,032)
Assets revaluation surplus net of deferred taxes	77,230,031
Total other comprehensive (loss) income items for the year, net of deferred taxes	53,462,762	$ 2,678	(64,188,516)	(67,322,442)
Total equity attributable to equity holders of the parent [member]
Controlling interest:
Unrealized (loss) gain on equity investments at fair value, net of deferred taxes	(1,952,414)		883,408	(3,765,688)
Translation effect of foreign entities	(13,558,774)		(34,010,066)	(61,223,458)
Remeasurement of defined benefit plan, net of deferred taxes	(10,026,454)		(29,153,554)	652,722
Assets revaluation surplus net of deferred taxes	64,835,155
Non-controlling interest of the items above	14,165,249		(1,908,304)	(2,986,018)
Total other comprehensive (loss) income items for the year, net of deferred taxes	$ 53,462,762		$ (64,188,516)	$ (67,322,442)

Valuation of derivatives intere

Valuation of derivatives interest cost from labor obligations and other financial items net - Schedule of Valuation of Derivatives and Other Financial Items (Detail) $ in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2020MXN ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)
Disclosure of detailed information about financial instruments [abstract]
(Loss) gain in valuation of derivatives, net	$ 12,378,193		$ 4,432,023	$ (4,686,407)
Capitalized interest expense (Note 10 b)	1,771,613		2,233,358	2,020,288
Commissions	(1,135,082)		(2,820,477)	(1,901,473)
Interest cost of labor obligations (Note 18)	(13,105,693)		(11,377,054)	(9,968,526)
Interest expense on taxes	(59,032)		(516,522)	(555,921)
Dividend received (Note 4)	2,122,826		1,773,336	2,605,333
Gain on net monetary positions	3,262,512	$ 164	4,267,194	4,429,145
Other financial cost	(3,944,229)		(5,067,200)	(2,118,755)
Total	$ 1,291,108	$ 65	$ (7,075,342)	$ (10,176,316)

Segments - Additional Informati

Segments - Additional Information (Detail) - Operating segments [member]	12 Months Ended
	Dec. 31, 2020
Disclosure of Operating Segments [Line Items]
Percentage of entity revenue	10.00%
Percentage of taxable profit	10.00%
Percentage of consolidated assets	10.00%

Segments - Summary of Operating

Segments - Summary of Operating Segments (Detail) $ in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2020MXN ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)	Dec. 31, 2020USD ($)	Dec. 31, 2017MXN ($)
Disclosure of Operating Segments [Line Items]
External revenues	$ 1,016,886,530		$ 1,007,347,869	$ 1,038,207,681
Total revenues	1,016,886,530	$ 50,975	1,007,347,869	1,038,207,681
Depreciation and amortization	164,243,683	8,233	158,915,210	155,712,580
Operating income (loss)	165,354,911		154,840,535	139,557,171
Interest income	5,062,036	254	6,284,672	10,646,169
Interest expense	38,661,740	1,938	37,911,339	31,771,433
Income tax	16,366,152	820	51,033,533	46,477,079
Equity interest in net income (loss) of associated companies	(287,006)		(17,609)	267
Net profit (loss) attributable to equity holders of the parent	46,852,605	$ 2,349	67,730,891	52,566,197
Assets by segment	1,625,048,227		1,531,933,657	1,429,223,392	$ 81,463
Plant, property and equipment, net	722,929,631		639,343,370	640,000,720	36,239	$ 676,343,198
Revalued of assets	107,152,628				5,371
Goodwill	143,052,859		152,899,801	145,566,497	7,171
Trademarks, net	3,777,418		3,488,709	4,667,205
Licenses and rights, net	111,630,716		104,848,545	103,298,395
Investment in associated companies	1,829,760		2,474,193	3,132,707	92
Liabilities by segments	1,309,930,609		1,305,026,792	1,183,350,970	$ 65,666
Operating segments [member] | Mexico [member]
Disclosure of Operating Segments [Line Items]
External revenues	214,578,601		226,164,232	207,610,244
Intersegment revenues	17,663,525		11,676,015	16,946,543
Total revenues	232,242,126		237,840,247	224,556,787
Depreciation and amortization	24,748,756		24,742,622	17,619,342
Operating income (loss)	70,851,525		67,694,409	57,450,599
Interest income	21,322,406		23,713,455	26,578,280
Interest expense	30,936,195		30,972,658	32,526,258
Income tax	4,905,863		30,000,511	28,842,505
Equity interest in net income (loss) of associated companies	(3,820)		(3,732)	(5,962)
Net profit (loss) attributable to equity holders of the parent	3,613,907		42,598,946	23,185,029
Assets by segment	947,396,510		915,233,048	970,564,314
Plant, property and equipment, net	52,117,395		54,589,459	56,056,634
Goodwill	26,949,185		27,396,393	27,104,632
Trademarks, net	126,823		46,476	227,774
Licenses and rights, net	12,017,318		11,087,882	10,573,147
Investment in associated companies	51,645		3,562,323	5,621,661
Liabilities by segments	725,408,198		718,354,229	748,965,728
Operating segments [member] | Telmex [member]
Disclosure of Operating Segments [Line Items]
External revenues	77,920,910		84,173,980	86,339,289
Intersegment revenues	13,668,264		11,863,364	9,741,908
Total revenues	91,589,174		96,037,344	96,081,197
Depreciation and amortization	13,341,479		16,346,927	18,358,248
Operating income (loss)	11,204,433		9,731,852	8,085,764
Interest income	1,479,021		1,839,973	420,380
Interest expense	1,306,867		1,439,785	1,153,913
Income tax	577,178		1,528,229	643,377
Equity interest in net income (loss) of associated companies	23,955		46,789	44,965
Net profit (loss) attributable to equity holders of the parent	(1,085,038)		(1,705,068)	(2,201,572)
Assets by segment	203,081,314		201,283,526	174,461,398
Plant, property and equipment, net	110,751,083		106,869,482	103,737,293
Goodwill	215,381		215,381	215,381
Trademarks, net	181,094		212,324	243,556
Licenses and rights, net	100,623		452,504
Investment in associated companies	613,449		610,807	563,667
Liabilities by segments	193,840,756		175,774,964	136,993,838
Operating segments [member] | Brazil [member]
Disclosure of Operating Segments [Line Items]
External revenues	163,865,421		177,596,077	188,712,666
Intersegment revenues	4,207,466		4,182,248	4,593,760
Total revenues	168,072,887		181,778,325	193,306,426
Depreciation and amortization	41,795,397		39,424,474	42,857,751
Operating income (loss)	25,203,504		28,846,565	23,494,903
Interest income	2,904,430		3,155,681	11,303,888
Interest expense	17,976,227		19,021,965	20,377,191
Income tax	(4,442,598)		4,251,116	4,026,444
Equity interest in net income (loss) of associated companies	(2,972)		(1,538)	(152)
Net profit (loss) attributable to equity holders of the parent	4,963,424		5,618,095	3,530,653
Assets by segment	386,982,711		382,561,753	390,791,480
Plant, property and equipment, net	145,307,497		174,761,167	173,197,708
Revalued of assets	36,076,207
Goodwill	16,048,092		25,379,805	21,388,124
Trademarks, net			37,207	124,910
Licenses and rights, net	26,171,345		29,324,718	25,873,910
Investment in associated companies	64,125		111,073	543
Liabilities by segments	263,989,566		297,877,328	298,308,084
Operating segments [member] | Southern Cone [member]
Disclosure of Operating Segments [Line Items]
External revenues	55,484,744		54,230,682	89,149,978
Intersegment revenues	1,220,100		11,041,705	13,200,358
Total revenues	56,704,844		65,272,387	102,350,336
Depreciation and amortization	13,095,004		13,847,506	13,526,361
Operating income (loss)	1,877,079		4,007,614	16,975,797
Interest income	980,581		896,256	2,251,474
Interest expense	3,334,966		3,849,318	4,338,941
Income tax	992,831		2,022,336	1,390,039
Equity interest in net income (loss) of associated companies	(15,422)		(23,424)	(20,871)
Net profit (loss) attributable to equity holders of the parent	1,456,062		(6,984)	6,065,703
Assets by segment	118,266,380		132,722,497	127,946,573
Plant, property and equipment, net	62,157,797		60,537,650	62,988,635
Revalued of assets	7,494,408
Goodwill	5,436,675		5,241,305	2,796,759
Licenses and rights, net	12,099,873		12,103,980	12,555,496
Investment in associated companies	(20,970)		(7,806)	20,697
Liabilities by segments	61,786,265		103,330,525	94,550,901
Operating segments [member] | Colombia [member]
Disclosure of Operating Segments [Line Items]
External revenues	77,282,658		74,274,684	75,460,428
Intersegment revenues	352,694		361,386	344,517
Total revenues	77,635,352		74,636,070	75,804,945
Depreciation and amortization	14,413,760		13,439,489	13,464,867
Operating income (loss)	15,111,947		15,324,977	14,388,552
Interest income	822,447		1,306,571	1,013,839
Interest expense	2,586,708		2,952,123	2,913,881
Income tax	2,078,789		5,405,452	2,251,877
Net profit (loss) attributable to equity holders of the parent	16,579,303		9,571,046	9,165,801
Assets by segment	132,210,369		115,851,227	111,975,598
Plant, property and equipment, net	48,876,853		50,133,642	51,422,548
Revalued of assets	12,893,284
Goodwill	12,253,743		12,124,685	12,770,380
Licenses and rights, net	12,363,039		5,530,422	3,400,235
Investment in associated companies	395		391	412
Liabilities by segments	63,610,642		55,576,253	56,211,438
Operating segments [member] | Andean [member]
Disclosure of Operating Segments [Line Items]
External revenues	53,846,358		55,440,675	55,633,192
Intersegment revenues	88,305		92,249	154,082
Total revenues	53,934,663		55,532,924	55,787,274
Depreciation and amortization	11,447,356		10,256,129	8,516,960
Operating income (loss)	8,698,645		8,023,002	5,003,915
Interest income	1,049,261		1,283,788	1,666,879
Interest expense	2,223,478		2,422,887	1,719,663
Income tax	3,115,693		1,681,159	2,498,666
Net profit (loss) attributable to equity holders of the parent	4,649,047		(2,604,646)	1,730,933
Assets by segment	101,717,708		94,021,632	96,347,779
Plant, property and equipment, net	36,102,261		39,068,450	35,800,477
Revalued of assets	9,500,708
Goodwill	4,866,363		4,895,331	5,242,365
Licenses and rights, net	6,870,531		8,064,487	9,651,582
Liabilities by segments	53,379,366		55,463,339	50,064,761
Operating segments [member] | Central America [member]
Disclosure of Operating Segments [Line Items]
External revenues	48,073,436		46,602,036	44,883,585
Intersegment revenues	121,580		132,061	149,445
Total revenues	48,195,016		46,734,097	45,033,030
Depreciation and amortization	14,355,899		11,045,817	8,940,655
Operating income (loss)	4,004,501		5,712,068	4,867,763
Interest income	1,130,767		532,046	1,566,086
Interest expense	1,559,917		1,406,720	509,081
Income tax	1,518,953		2,355,380	2,533,600
Equity interest in net income (loss) of associated companies			(28,795)
Net profit (loss) attributable to equity holders of the parent	1,919,558		2,335,963	2,821,733
Assets by segment	88,690,683		77,355,732	81,640,157
Plant, property and equipment, net	37,855,227		38,934,747	37,146,601
Revalued of assets	7,059,247
Goodwill	6,345,659		7,289,748	5,466,871
Licenses and rights, net	5,427,857		4,390,547	3,605,416
Investment in associated companies	25,413		25,603	24,262
Liabilities by segments	34,252,511		37,993,180	28,592,953
Operating segments [member] | U.S.A [member]
Disclosure of Operating Segments [Line Items]
External revenues	177,179,369		155,864,392	153,266,315
Total revenues	177,179,369		155,864,392	153,266,315
Depreciation and amortization	1,561,284		1,396,422	1,545,395
Operating income (loss)	10,579,394		2,968,236	2,665,270
Interest income	77,235		324,932	559,548
Interest expense	255		385	0
Income tax	2,856,881		1,119,478	810,898
Net profit (loss) attributable to equity holders of the parent	7,797,723		2,095,807	2,820,505
Assets by segment	35,083,285		30,775,893	38,814,907
Plant, property and equipment, net	1,761,595		1,405,755	1,356,237
Goodwill	3,362,899		3,220,105	3,328,533
Trademarks, net	269,325		369,950	507,033
Liabilities by segments	33,141,315		31,557,816	35,552,678
Operating segments [member] | Caribbean [member]
Disclosure of Operating Segments [Line Items]
External revenues	37,182,842		34,580,822	36,435,541
Intersegment revenues	1,440,983		1,136,879	204,294
Total revenues	38,623,825		35,717,701	36,639,835
Depreciation and amortization	7,094,331		6,322,648	5,036,831
Operating income (loss)	6,701,086		5,741,368	5,811,846
Interest income	1,105,420		1,478,560	1,458,874
Interest expense	1,658,619		1,435,862	561,867
Income tax	2,524,214		719,774	2,774,204
Net profit (loss) attributable to equity holders of the parent	3,294,111		4,312,630	3,644,697
Assets by segment	109,914,293		100,694,650	102,531,547
Plant, property and equipment, net	39,128,447		38,223,641	38,011,242
Revalued of assets	2,572,504
Goodwill	14,186,723		14,186,723	14,186,723
Trademarks, net	219,087		227,156	249,984
Licenses and rights, net	8,616,880		7,942,670	10,294,336
Liabilities by segments	60,839,340		54,276,868	58,716,154
Operating segments [member] | Europe [member]
Disclosure of Operating Segments [Line Items]
External revenues	111,472,191		98,420,289	100,716,443
Total revenues	111,472,191		98,420,289	100,716,443
Depreciation and amortization	25,593,204		24,975,146	26,838,972
Operating income (loss)	13,159,865		8,687,862	4,731,562
Interest income	90,746		115,359	122,133
Interest expense	2,546,255		2,220,168	1,973,431
Income tax	2,234,065		1,946,255	707,093
Equity interest in net income (loss) of associated companies	(288,747)		(6,909)	(17,713)
Net profit (loss) attributable to equity holders of the parent	7,777,426		5,051,145	3,809,694
Assets by segment	239,583,759		191,744,924	186,135,358
Plant, property and equipment, net	82,595,077		75,707,738	80,421,642
Revalued of assets	31,556,270
Goodwill	53,388,139		52,950,325	53,066,729
Trademarks, net	2,981,089		2,595,596	3,313,948
Licenses and rights, net	27,963,250		25,951,335	27,344,273
Investment in associated companies				748,674
Liabilities by segments	138,747,621		124,319,541	117,214,746
Eliminations [member]
Disclosure of Operating Segments [Line Items]
Intersegment revenues	(38,762,917)		(40,485,907)	(45,334,907)
Total revenues	(38,762,917)		(40,485,907)	(45,334,907)
Depreciation and amortization	(3,202,787)		(2,881,970)	(992,802)
Operating income (loss)	(2,037,068)		(1,897,418)	(3,918,800)
Interest income	(25,900,278)		(28,361,949)	(36,295,212)
Interest expense	(25,467,747)		(27,810,532)	(34,302,793)
Income tax	4,283		3,843	(1,624)
Net profit (loss) attributable to equity holders of the parent	(4,112,918)		463,957	(2,006,979)
Assets by segment	(737,878,785)		(710,311,225)	(851,985,719)
Plant, property and equipment, net	(876,229)		(888,361)	(138,297)
Investment in associated companies	1,095,703		(1,828,198)	(3,847,209)
Liabilities by segments	$ (319,064,971)		$ (349,497,251)	$ (441,820,311)

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) € / shares in Units, $ in Thousands, € in Billions	1 Months Ended
	Feb. 28, 2021EUR (€)€ / shares	Feb. 02, 2021	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)
Disclosure of non-adjusting events after reporting period [line items]
Borrowings | $			$ 628,382,956	$ 624,254,477
Subsequent Events [Member] | Senior Unsecured Bonds [Member]
Disclosure of non-adjusting events after reporting period [line items]
Borrowings | €	€ 2.1
Borrowings, maturity	3 years
Borrowings, interest rate		0.00%
Percentage Of Issue Price On Principle Amount	104.75%
Percentage of annual yield-to-maturity	1.53%
Proceeds from issue of bonds, notes and debentures | €	€ 2.2
Debt Conversion Converted Instrument Shares Issued On Exchange Price	€ 3.1185
Debt Conversion Converted Instrument Shares Issued Price On premium	15
Debt Conversion Converted Instrument Shares Issued On Reference Price	€ 2.7117