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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