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Intangible Assets, Net and Goodwill - Summary of Analysis of Intangible Assets (Detail) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Licenses and rights of use [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Balance at beginning of year $ 118,481,097 $ 111,432,979 $ 103,298,395
Acquisitions 24,406,905 15,079,714 13,206,877
Acquisitions in business combinations   4,436,313 7,844,339
Disposals and other 2,336,382 1,608,873 4,894,490
Amortization of the year (14,682,451) (14,274,497) (11,577,160)
Effect of translation of foreign subsidiaries (274,188) 197,715 (6,233,962)
Balance at end of year 130,267,745 118,481,097 111,432,979
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 253,090,161 246,100,862 233,478,974
Acquisitions 24,406,905 15,079,714 13,206,877
Acquisitions in business combinations   4,436,313 7,844,339
Disposals and other (4,427,685) 1,502,981 7,286,114
Effect of translation of foreign subsidiaries (7,011,691) (14,029,709) (15,715,442)
Balance at end of year 266,057,690 253,090,161 246,100,862
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 (134,609,064) (134,667,883) (130,180,579)
Disposals and other 6,764,067 105,892 (2,391,624)
Amortization of the year (14,682,451) (14,274,497) (11,577,160)
Effect of translation of foreign subsidiaries 6,737,503 14,227,424 9,481,480
Balance at end of year (135,789,945) (134,609,064) (134,667,883)
Trademarks [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Balance at beginning of year 3,777,418 3,488,709 4,667,205
Acquisitions 75,100 162,309 53,467
Acquisitions in business combinations   12,110  
Disposals and other (326,949) (276) (6,012)
Amortization of the year (140,205) (300,727) (1,008,483)
Effect of translation of foreign subsidiaries (93,201) 415,293 (217,468)
Balance at end of year 3,292,163 3,777,418 3,488,709
Trademarks [member] | Cost [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Balance at beginning of year 29,132,365 [1] 27,419,008 28,207,166
Acquisitions 75,100 [1] 162,309 53,467
Acquisitions in business combinations   12,110  
Disposals and other (1,129,666) [1] 4,000 (6,012)
Effect of translation of foreign subsidiaries (401,946) [1] 1,534,938 (835,613)
Balance at end of year 27,675,853 [1] 29,132,365 [1] 27,419,008
Trademarks [member] | Accumulated depreciation [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Balance at beginning of year (25,354,947) (23,930,299) (23,539,961)
Acquisitions     0
Disposals and other 802,717 (4,276) 0
Amortization of the year (140,205) (300,727) (1,008,483)
Effect of translation of foreign subsidiaries 308,745 (1,119,645) 618,145
Balance at end of year (24,383,690) (25,354,947) (23,930,299)
Customer relationships [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Balance at beginning of year 4,153,661 3,099,381 6,781,531
Acquisitions 229,936 1,935 20,248
Acquisitions in business combinations   2,689,718  
Disposals and other (302,666) (4,908) 5,507
Amortization of the year (707,500) (1,654,237) (3,371,924)
Effect of translation of foreign subsidiaries (12,267) 21,772 (335,981)
Balance at end of year 3,361,164 4,153,661 3,099,381
Customer relationships [member] | Cost [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Balance at beginning of year 29,579,266 [1] 22,875,011 25,543,068
Acquisitions 229,936 [1] 1,935 20,248
Acquisitions in business combinations   2,689,718  
Disposals and other (4,133,408) [1] (5,763) 5,507
Effect of translation of foreign subsidiaries (1,105,668) [1] 4,018,365 (2,693,812)
Balance at end of year 24,570,126 [1] 29,579,266 [1] 22,875,011
Customer relationships [member] | Accumulated depreciation [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Balance at beginning of year (25,425,605) (19,775,630) (18,761,537)
Acquisitions     0
Disposals and other 3,830,742 855 0
Amortization of the year (707,500) (1,654,237) (3,371,924)
Effect of translation of foreign subsidiaries 1,093,401 (3,996,593) 2,357,831
Balance at end of year (21,208,962) (25,425,605) (19,775,630)
Software licenses [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Balance at beginning of year 5,067,698 5,103,367 6,604,455
Acquisitions 2,659,704 2,445,784 2,729,480
Acquisitions in business combinations   36  
Disposals and other (2,315) (471,812) (949,859)
Amortization of the year (2,738,978) (2,667,870) (2,479,088)
Effect of translation of foreign subsidiaries (172,647) 658,193 (801,621)
Balance at end of year 4,813,462 5,067,698 5,103,367
Software licenses [member] | Cost [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Balance at beginning of year 17,301,146 13,104,110 14,309,258
Acquisitions 2,660,330 2,445,784 2,729,480
Acquisitions in business combinations   36  
Disposals and other (3,484,755) (2,485,429) (949,858)
Amortization of the year     0
Effect of translation of foreign subsidiaries (1,225,585) 4,236,645 (2,984,770)
Balance at end of year 15,251,136 17,301,146 13,104,110
Software licenses [member] | Accumulated depreciation [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Balance at beginning of year (12,233,448) (8,000,743) (7,704,803)
Acquisitions 626   0
Disposals and other 3,482,440 2,013,617 (1)
Amortization of the year (2,738,978) (2,667,870) (2,479,088)
Effect of translation of foreign subsidiaries 1,052,938 (3,578,452) 2,183,149
Balance at end of year (10,437,674) (12,233,448) (8,000,743)
Content rights [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Balance at beginning of year 1,977,093 2,044,953 786,117
Acquisitions 818,436 1,570,415 1,427,694
Disposals and other (429,415) (313,942) 1,629,287
Amortization of the year (899,666) (1,440,749) (1,772,779)
Effect of translation of foreign subsidiaries 24,782 116,416 (25,366)
Balance at end of year 1,491,230 1,977,093 2,044,953
Content rights [member] | Cost [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Balance at beginning of year 12,036,312 10,160,182 7,549,709
Acquisitions 818,436 1,570,415 1,427,694
Disposals and other (281,747) (313,942) 1,638,007
Effect of translation of foreign subsidiaries 429,319 619,657 (455,228)
Balance at end of year 13,002,320 12,036,312 10,160,182
Content rights [member] | Accumulated depreciation [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Balance at beginning of year (10,059,219) (8,115,229) (6,763,592)
Disposals and other (147,668)   (8,720)
Amortization of the year (899,666) (1,440,749) (1,772,779)
Effect of translation of foreign subsidiaries (404,537) (503,241) 429,862
Balance at end of year (11,511,090) (10,059,219) (8,115,229)
Intangibles, net [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Balance at beginning of year 133,456,967 125,169,389 122,137,703
Acquisitions 28,190,081 19,260,157 17,437,766
Acquisitions in business combinations   7,138,177 7,844,339
Disposals and other 1,275,037 817,935 5,573,413
Amortization of the year (19,168,800) (20,338,080) (20,209,434)
Effect of translation of foreign subsidiaries (527,521) 1,409,389 (7,614,398)
Balance at end of year 143,225,764 133,456,967 125,169,389
Goodwill [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Balance at beginning of year 143,052,859 [1] 152,899,801 145,566,497
Acquisitions in business combinations   (7,014,120) 10,869,571
Disposals and other (3,516,287) [1] (537,343) (843,005)
Effect of translation of foreign subsidiaries (2,958,378) [1] (2,295,479) (2,693,262)
Balance at end of year $ 136,578,194 [1] $ 143,052,859 [1] $ 152,899,801
[1] Includes disposals related to the sale of TracFone. See Note 2, Ac).