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Segments - Summary of Operating Segments (Detail)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2020
MXN ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2017
MXN ($)
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)