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Segments - Summary of Operating Segments (Detail)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2023
MXN ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
MXN ($)
Dec. 31, 2021
MXN ($)
Dec. 31, 2023
USD ($)
Disclosure of Operating Segments [Line Items]          
External revenues $ 816,012,844   $ 844,501,397 $ 830,687,452  
Total revenues 816,012,844 $ 48,303 844,501,397 830,687,452  
Depreciation and amortization 151,786,064 8,985 158,633,786 156,302,992  
Operating income 167,783,515   170,870,752 167,556,250  
Interest income 9,628,340 570 4,823,579 3,834,150  
Interest expense 44,545,241 2,637 41,258,803 35,738,305  
Income tax 34,544,003 2,045 46,044,089 32,717,477  
Equity interest in net result of associated companies (5,371,824)   (1,811,432) 113,918  
Net profit (loss) attributable to equity holders of the parent continues operations 76,110,617 $ 4,505 82,878,406 68,187,225  
Net profit (loss) attributable to equity holders of the parent discontinued operations 0   (6,719,015) 124,235,942  
Net profit (loss) attributable to equity holders of the parent 76,110,617   76,159,391 192,423,167  
Assets by segment 1,564,185,960   1,618,099,344 1,689,649,849 $ 92,591
Plant, property and equipment, net 619,411,625   618,872,491 633,024,004  
Revalued of assets 9,239,279   38,353,719 98,172,675  
Goodwill 146,078,897   141,121,365 136,578,194 8,647
Trademarks, net 2,767,165   3,014,557 3,292,163  
Licenses and rights, net 99,897,626   107,795,187 123,286,860  
Investments in associated companies 14,380,463   23,975,462 3,052,481  
Liabilities by segments 1,142,483,578   1,180,270,071 1,235,608,123 $ 67,629
Operating segments [member] | Mexico [member]          
Disclosure of Operating Segments [Line Items]          
External revenues 248,890,778   236,608,249 225,219,719  
Intersegment revenues 9,896,948   9,290,955 18,041,465  
Total revenues 258,787,726   245,899,204 243,261,184  
Depreciation and amortization 26,640,899   26,383,113 25,797,791  
Operating income 84,816,739   76,708,954 77,783,972  
Interest income 27,202,474   18,336,415 14,864,242  
Interest expense 28,164,647   24,909,724 24,586,641  
Income tax 30,378,228   30,642,242 25,002,390  
Equity interest in net result of associated companies (5,458,577)   (1,821,608) 85,648  
Net profit (loss) attributable to equity holders of the parent continues operations     63,711,537 34,195,093  
Net profit (loss) attributable to equity holders of the parent 43,053,030   63,711,537 34,195,093  
Assets by segment 1,029,618,098   1,042,849,460 999,502,407  
Plant, property and equipment, net 46,695,107   49,677,868 50,420,866  
Goodwill 26,434,428   26,481,707 26,965,618  
Trademarks, net 110,950   110,397 90,673  
Licenses and rights, net 10,555,645   10,559,914 11,081,972  
Investments in associated companies 19,797,046   24,656,295 4,725,279  
Liabilities by segments 628,519,912   621,482,350 679,954,783  
Operating segments [member] | Telmex [member]          
Disclosure of Operating Segments [Line Items]          
External revenues 84,821,370   83,046,967 87,189,642  
Intersegment revenues 17,010,698   16,937,889 15,237,420  
Total revenues 101,832,068   99,984,856 102,427,062  
Depreciation and amortization 14,333,486   13,171,616 12,740,332  
Operating income 12,063,692   16,172,472 21,100,316  
Interest income 1,465,927   925,158 758,126  
Interest expense 7,176,879   3,342,459 1,385,103  
Income tax (625,561)   2,767,673 2,496,010  
Equity interest in net result of associated companies 41,642   31,000 44,525  
Net profit (loss) attributable to equity holders of the parent continues operations     (373,036) 4,594,450  
Net profit (loss) attributable to equity holders of the parent (5,278,857)   (373,036) 4,594,450  
Assets by segment 238,216,814   215,543,807 195,869,232  
Plant, property and equipment, net 150,219,598   134,928,482 118,056,718  
Goodwill 215,381   215,381 215,381  
Trademarks, net 87,404   118,634 149,865  
Licenses and rights, net 92,065   106,659 129,233  
Investments in associated companies 586,515   550,493 522,403  
Liabilities by segments 236,678,379   204,294,033 176,177,522  
Operating segments [member] | Brazil [member]          
Disclosure of Operating Segments [Line Items]          
External revenues 162,224,734   165,804,342 148,729,232  
Intersegment revenues 4,485,048   5,075,716 4,044,386  
Total revenues 166,709,782   170,880,058 152,773,618  
Depreciation and amortization 44,302,136   43,422,821 40,342,871  
Operating income 25,618,154   26,665,816 21,867,457  
Interest income 4,252,205   2,679,103 2,104,574  
Interest expense 25,691,398   23,411,387 15,875,138  
Income tax (1,730,068)   454,205 (9,603,701)  
Equity interest in net result of associated companies 32,776   20,864 4,575  
Net profit (loss) attributable to equity holders of the parent continues operations     10,254,969 14,185,905  
Net profit (loss) attributable to equity holders of the parent 9,866,950   10,254,969 14,185,905  
Assets by segment 383,653,519   407,802,373 407,458,440  
Plant, property and equipment, net 150,226,089   159,382,793 153,607,199  
Revalued of assets       33,004,669  
Goodwill 29,437,800   31,085,202 15,335,322  
Licenses and rights, net 32,446,402   37,638,695 39,620,009  
Investments in associated companies 57,133   22,708 65,699  
Liabilities by segments 313,072,959   297,234,805 273,655,967  
Operating segments [member] | Southern Cone Argentina [member]          
Disclosure of Operating Segments [Line Items]          
External revenues 18,884,623   34,363,532 [1] 35,419,511 [1]  
Intersegment revenues 38,080   153,155 [1] 224,300 [1]  
Total revenues 18,922,703   34,516,687 [1] 35,643,811 [1]  
Depreciation and amortization 5,677,627   9,002,551 [1] 7,581,101 [1]  
Operating income 515,233   2,570,848 [1] 3,520,432 [1]  
Interest income 543,248   718,676 [1] 820,505 [1]  
Interest expense 968,299   2,258,095 [1] 2,518,149 [1]  
Income tax (4,760,360)   (286,202) [1] 1,951,409 [1]  
Equity interest in net result of associated companies (1,814)   (2,198) [1] (19,073) [1]  
Net profit (loss) attributable to equity holders of the parent continues operations [1]     (700,478) (2,999,123)  
Net profit (loss) attributable to equity holders of the parent (8,101,032)   (700,478) [1] (2,999,123) [1]  
Assets by segment 53,570,541   79,283,120 [1] 77,951,595 [1]  
Plant, property and equipment, net 21,087,810   38,525,335 [1] 38,039,995 [1]  
Revalued of assets [1]       2,192,978  
Goodwill [1]     199,984 198,010  
Licenses and rights, net 10,603,388   12,137,641 [1] 11,824,500 [1]  
Investments in associated companies 993   (19,866) [1] (34,401) [1]  
Liabilities by segments 36,668,486   47,430,485 [1] 45,203,170 [1]  
Operating segments [member] | Southern Cone Uruguay And Paraguay [member]          
Disclosure of Operating Segments [Line Items]          
External revenues 3,995,812   4,456,541 [1] 4,825,315 [1]  
Intersegment revenues 9,876   64,779 [1] (73,993) [1]  
Total revenues 4,005,688   4,521,320 [1] 4,751,322 [1]  
Depreciation and amortization 1,319,462   1,808,414 [1] 2,010,624 [1]  
Operating income (444,485)   (778,032) [1] (549,329) [1]  
Interest income 4,231   3,463 [1] 2,165 [1]  
Interest expense 113,909   316,945 [1] 275,047 [1]  
Income tax (1,721)   126,003 [1] (1,168,564) [1]  
Net profit (loss) attributable to equity holders of the parent continues operations [1]     (231,151) 152,766  
Net profit (loss) attributable to equity holders of the parent (294,922)   (231,151) [1] 152,766 [1]  
Assets by segment 9,187,465   10,258,999 [1] 58,312,728 [1]  
Plant, property and equipment, net 4,089,689   4,149,285 [1] 26,824,991 [1]  
Revalued of assets [1]       3,966,099  
Goodwill 201,912     4,993,831 [1]  
Licenses and rights, net 1,017,772   827,380 [1] 1,966,503 [1]  
Liabilities by segments 4,512,644   7,120,057 [1] 27,977,789 [1]  
Operating segments [member] | Colombia [member]          
Disclosure of Operating Segments [Line Items]          
External revenues 62,342,147   70,925,374 79,312,071  
Intersegment revenues 376,010   374,225 360,638  
Total revenues 62,718,157   71,299,599 79,672,709  
Depreciation and amortization 13,360,622   13,085,226 15,067,211  
Operating income 9,958,999   14,170,936 15,165,356  
Interest income 867,151   624,304 431,314  
Interest expense 3,342,195   2,699,010 2,240,707  
Income tax 1,427,740   2,286,809 3,112,946  
Net profit (loss) attributable to equity holders of the parent continues operations     6,486,771 5,959,563  
Net profit (loss) attributable to equity holders of the parent 4,180,800   6,486,771 5,959,563  
Assets by segment 115,103,155   104,769,670 133,232,525  
Plant, property and equipment, net 53,038,210   44,999,710 48,888,907  
Revalued of assets 8,040,753   7,700,459 10,266,464  
Goodwill 9,304,613   8,495,090 11,685,585  
Licenses and rights, net 10,227,439   8,068,013 11,384,533  
Investments in associated companies       351  
Liabilities by segments 59,510,611   57,393,854 65,631,866  
Operating segments [member] | Andean [member]          
Disclosure of Operating Segments [Line Items]          
External revenues 52,903,716   55,426,258 52,888,323  
Intersegment revenues 87,974   72,142 73,828  
Total revenues 52,991,690   55,498,400 52,962,151  
Depreciation and amortization 10,084,882   10,698,869 11,211,523  
Operating income 10,638,985   8,262,395 7,457,802  
Interest income 2,338,242   906,176 833,540  
Interest expense 2,333,600   860,572 1,213,421  
Income tax 4,141,240   2,870,743 2,375,281  
Net profit (loss) attributable to equity holders of the parent continues operations     6,122,291 4,180,473  
Net profit (loss) attributable to equity holders of the parent 7,769,059   6,122,291 4,180,473  
Assets by segment 98,293,206   85,782,831 95,719,937  
Plant, property and equipment, net 30,416,383   33,480,299 34,395,339  
Revalued of assets     5,938,449 8,389,460  
Goodwill 4,603,998   4,678,851 4,688,154  
Trademarks, net 555        
Licenses and rights, net 3,180,343   4,271,910 5,502,139  
Liabilities by segments 46,189,708   36,223,727 44,676,727  
Operating segments [member] | Central America [member]          
Disclosure of Operating Segments [Line Items]          
External revenues 43,964,411   47,054,127 [2] 45,406,174 [2]  
Intersegment revenues 99,850   160,459 [2] 62,764 [2]  
Total revenues 44,064,261   47,214,586 [2] 45,468,938 [2]  
Depreciation and amortization 10,028,603   11,178,361 [2] 10,830,440 [2]  
Operating income 6,956,209   7,540,132 [2] 8,700,382 [2]  
Interest income 621,068   431,741 [2] 269,379 [2]  
Interest expense 1,325,213   1,033,792 [2] 1,061,526 [2]  
Income tax 1,728,005   1,708,728 [2] 2,940,404 [2]  
Equity interest in net result of associated companies (1,143)        
Net profit (loss) attributable to equity holders of the parent continues operations [2]     5,059,038 4,746,847  
Net profit (loss) attributable to equity holders of the parent 4,733,871   5,059,038 [2] 4,746,847 [2]  
Assets by segment 91,976,207   96,321,649 [2] 101,725,955 [2]  
Plant, property and equipment, net 42,790,489   41,312,113 [2] 42,407,727 [2]  
Revalued of assets [2]       9,113,632  
Goodwill 6,279,966   6,312,511 [2] 6,002,380 [2]  
Licenses and rights, net 4,660,729   3,599,560 [2] 5,220,437 [2]  
Investments in associated companies 19,747   23,896 [2] 26,348 [2]  
Liabilities by segments 37,051,349   42,725,447 [2] 42,823,861 [2]  
Operating segments [member] | Caribbean [member]          
Disclosure of Operating Segments [Line Items]          
External revenues 37,148,876   40,859,951 37,858,979  
Intersegment revenues 1,119,554   1,854,029 2,069,648  
Total revenues 38,268,430   42,713,980 39,928,627  
Depreciation and amortization 7,189,119   7,133,908 6,987,129  
Operating income 7,723,115   10,284,834 8,661,475  
Interest income 1,616,687   701,794 701,785  
Interest expense 1,735,648   1,152,370 1,066,733  
Income tax 1,674,363   2,432,392 2,171,594  
Net profit (loss) attributable to equity holders of the parent continues operations     6,649,004 5,151,166  
Net profit (loss) attributable to equity holders of the parent 5,604,618   6,649,004 5,151,166  
Assets by segment 101,862,049   101,143,182 102,949,901  
Plant, property and equipment, net 35,214,165   40,606,623 41,601,009  
Revalued of assets     1,434,188 2,564,149  
Goodwill 14,186,723   14,186,723 14,186,723  
Trademarks, net 185,566   220,350 229,000  
Licenses and rights, net 8,593,842   10,124,134 10,847,685  
Liabilities by segments 47,864,665   48,434,551 53,885,848  
Operating segments [member] | Europe [member]          
Disclosure of Operating Segments [Line Items]          
External revenues 100,836,377   105,956,056 113,838,486  
Total revenues 100,836,377   105,956,056 113,838,486  
Depreciation and amortization 21,008,775   22,761,938 27,469,463  
Operating income 15,751,978   16,155,520 13,421,147  
Interest income 392,951   229,958 116,031  
Interest expense 1,971,189   1,281,857 2,414,415  
Income tax 2,785,214   3,151,281 3,438,161  
Equity interest in net result of associated companies 15,292   (39,490) (1,757)  
Net profit (loss) attributable to equity holders of the parent continues operations     11,795,662 8,313,018  
Net profit (loss) attributable to equity holders of the parent 11,145,743   11,795,662 8,313,018  
Assets by segment 167,594,129   154,774,150 210,944,575  
Plant, property and equipment, net 86,706,171   72,272,633 79,764,422  
Revalued of assets 1,198,526   23,280,623 28,675,224  
Goodwill 55,414,076   49,465,916 52,307,190  
Trademarks, net 2,382,690   2,565,176 2,822,625  
Licenses and rights, net 18,520,001   20,461,281 25,709,849  
Investments in associated companies 17,175   2,058    
Liabilities by segments 93,944,278   97,527,392 134,357,142  
Eliminations [member]          
Disclosure of Operating Segments [Line Items]          
Intersegment revenues (33,124,038)   (33,983,349) (40,040,456)  
Total revenues (33,124,038)   (33,983,349) (40,040,456)  
Depreciation and amortization (2,159,547)   (13,031) (3,735,493)  
Operating income (5,815,104)   (6,883,123) (9,572,760)  
Interest income (29,675,844)   (20,733,209) (17,067,511)  
Interest expense (28,277,736)   (20,007,408) (16,898,575)  
Income tax (473,077)   (109,785) 1,547  
Net profit (loss) attributable to equity holders of the parent continues operations     (25,896,201) (10,292,933)  
Net profit (loss) attributable to equity holders of the parent 3,431,357   (25,896,201) (10,292,933)  
Assets by segment (724,889,223)   (680,429,897) (694,017,446)  
Plant, property and equipment, net (1,072,086)   (462,650) (983,169)  
Investments in associated companies (6,098,146)   (1,260,122) (2,253,198)  
Liabilities by segments $ (361,529,413)   $ (279,596,630) $ (308,736,552)  
[1] Discontinued operations (ClaroVTR joint venture)
[2] Discontinued operations (Panama disposal)