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Segments - Summary of Operating Segments (Detail)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2022
MXN ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
MXN ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2022
USD ($)
Disclosure of Operating Segments [Line Items]          
External revenues $ 844,501,397   $ 830,687,452 $ 815,399,087  
Total revenues 844,501,397 $ 43,499 830,687,452 [1] 815,399,087 [1]  
Depreciation and amortization 158,633,786 8,171 156,302,992 [1] 154,215,420 [1]  
Operating income 170,870,752   167,556,250 148,812,807  
Interest income 4,823,579 248 3,834,150 [1] 5,060,636 [1]  
Interest expense 41,258,803 2,125 35,738,305 [1] 38,165,205 [1]  
Income tax 46,044,089 2,372 32,717,477 [1] 13,178,171 [1]  
Equity interest in net result of associated companies (1,811,432)   113,918 (287,006)  
Net profit (loss) attributable to equity holders of the parent continues operations 82,878,406 4,269 68,187,225 [1] 35,264,826 [1]  
Net profit (loss) attributable to equity holders of the parent discontinued operations (6,719,015) $ (346) 124,235,942 [1] 11,587,779 [1]  
Net profit (loss) attributable to equity holders of the parent 76,159,391   192,423,167 46,852,605  
Assets by segment 1,618,099,344   1,689,649,849 1,625,048,227 $ 83,347
Plant, property and equipment, net 618,872,491   633,024,004 615,777,003  
Revalued of assets 38,353,719   98,172,675 107,152,628  
Goodwill 141,121,365   136,578,194 143,052,859 7,269
Trademarks, net 3,014,557   3,292,163 3,777,418  
Licenses and rights, net 107,795,187   123,286,860 111,630,716  
Investments in associated companies 23,975,462   3,052,481 1,829,760  
Liabilities by segments 1,180,270,071   1,235,608,123 1,309,930,609 $ 60,794
Mexico [member]          
Disclosure of Operating Segments [Line Items]          
Net profit (loss) attributable to equity holders of the parent continues operations 63,711,537   34,195,093 3,613,907  
Telmex [member]          
Disclosure of Operating Segments [Line Items]          
Net profit (loss) attributable to equity holders of the parent continues operations (373,036)   4,594,450 (1,085,038)  
Brazil [member]          
Disclosure of Operating Segments [Line Items]          
Net profit (loss) attributable to equity holders of the parent continues operations 10,254,969   14,185,905 4,963,424  
Southern Cone [member]          
Disclosure of Operating Segments [Line Items]          
Net profit (loss) attributable to equity holders of the parent continues operations (1,157,911) [2]   (2,804,630) [3] 4,909,164 [3]  
Colombia [member]          
Disclosure of Operating Segments [Line Items]          
Net profit (loss) attributable to equity holders of the parent continues operations 6,486,771   5,959,563 16,579,303  
Andean [member]          
Disclosure of Operating Segments [Line Items]          
Net profit (loss) attributable to equity holders of the parent continues operations 6,122,291   4,180,473 4,649,047  
Central America [member]          
Disclosure of Operating Segments [Line Items]          
Net profit (loss) attributable to equity holders of the parent continues operations 5,059,038 [4]   4,746,847 [5] 3,922,577 [5]  
U.S.A [member]          
Disclosure of Operating Segments [Line Items]          
Assets by segment [6]       35,083,285  
Plant, property and equipment, net [6]       1,761,595  
Goodwill [6]       3,362,899  
Trademarks, net [6]       269,325  
Liabilities by segments [6]       33,141,315  
Caribbean [member]          
Disclosure of Operating Segments [Line Items]          
Net profit (loss) attributable to equity holders of the parent continues operations 6,649,004   5,151,166 3,294,111  
Europe [member]          
Disclosure of Operating Segments [Line Items]          
Net profit (loss) attributable to equity holders of the parent continues operations 11,795,662   8,313,018 7,777,426  
Operating segments [member] | Mexico [member]          
Disclosure of Operating Segments [Line Items]          
External revenues 236,608,249   225,219,719 214,578,600  
Intersegment revenues 9,290,955   18,041,465 17,663,525  
Total revenues 245,899,204   243,261,184 232,242,125  
Depreciation and amortization 26,383,113   25,797,791 24,748,756  
Operating income 76,708,954   77,783,972 70,851,525  
Interest income 18,336,415   14,864,242 21,322,406  
Interest expense 24,909,724   24,586,641 30,936,195  
Income tax 30,642,242   25,002,390 4,905,863  
Equity interest in net result of associated companies (1,821,608)   85,648 (3,820)  
Net profit (loss) attributable to equity holders of the parent 63,711,537   34,195,093 3,613,907  
Assets by segment 1,042,849,460   999,502,407 947,396,510  
Plant, property and equipment, net 49,677,868   50,420,866 52,117,395  
Goodwill 26,481,707   26,965,618 26,949,185  
Trademarks, net 110,397   90,673 126,823  
Licenses and rights, net 10,559,914   11,081,972 12,017,318  
Investments in associated companies 24,656,295   4,725,279 51,645  
Liabilities by segments 621,482,350   679,954,783 725,408,198  
Operating segments [member] | Telmex [member]          
Disclosure of Operating Segments [Line Items]          
External revenues 83,046,967   87,189,642 77,920,910  
Intersegment revenues 16,937,889   15,237,420 13,668,264  
Total revenues 99,984,856   102,427,062 91,589,174  
Depreciation and amortization 13,171,616   12,740,332 13,341,479  
Operating income 16,172,472   21,100,316 11,204,433  
Interest income 925,158   758,126 1,479,021  
Interest expense 3,342,459   1,385,103 1,306,867  
Income tax 2,767,673   2,496,010 577,178  
Equity interest in net result of associated companies 31,000   44,525 23,955  
Net profit (loss) attributable to equity holders of the parent (373,036)   4,594,450 (1,085,038)  
Assets by segment 215,543,807   195,869,232 203,081,314  
Plant, property and equipment, net 134,928,482   118,056,718 110,751,083  
Goodwill 215,381   215,381 215,381  
Trademarks, net 118,634   149,865 181,094  
Licenses and rights, net 106,659   129,233 100,623  
Investments in associated companies 550,493   522,403 613,449  
Liabilities by segments 204,294,033   176,177,522 193,840,756  
Operating segments [member] | Brazil [member]          
Disclosure of Operating Segments [Line Items]          
External revenues 165,804,342   148,729,232 163,865,421  
Intersegment revenues 5,075,716   4,044,386 4,207,466  
Total revenues 170,880,058   152,773,618 168,072,887  
Depreciation and amortization 43,422,821   40,342,871 41,795,397  
Operating income 26,665,816   21,867,457 25,203,504  
Interest income 2,679,103   2,104,574 2,904,430  
Interest expense 23,411,387   15,875,138 17,976,227  
Income tax 454,205   (9,603,701) (4,442,598)  
Equity interest in net result of associated companies 20,864   4,575 (2,972)  
Net profit (loss) attributable to equity holders of the parent 10,254,969   14,185,905 4,963,424  
Assets by segment 407,802,373   407,458,440 386,982,711  
Plant, property and equipment, net 159,382,793   153,607,199 145,307,497  
Revalued of assets 0   33,004,669 36,076,207  
Goodwill 31,085,202   15,335,322 16,048,092  
Licenses and rights, net 37,638,695   39,620,009 26,171,345  
Investments in associated companies 22,708   65,699 64,125  
Liabilities by segments 297,234,805   273,655,967 263,989,566  
Operating segments [member] | Southern Cone [member]          
Disclosure of Operating Segments [Line Items]          
External revenues 38,820,073 [2]   40,244,826 [3] 34,426,863 [3]  
Intersegment revenues (95,105) [2]   (699,479) [3] 1,220,100 [3]  
Total revenues 38,724,968 [2]   39,545,347 [3] 35,646,963 [3]  
Depreciation and amortization 10,807,072 [2]   9,585,858 [3] 7,199,898 [3]  
Operating income 1,796,672 [2]   2,968,702 [3] 3,238,167 [3]  
Interest income 719,851 [2]   820,449 [3] 979,181 [3]  
Interest expense 2,573,356 [2]   2,790,000 [3] 2,955,339 [3]  
Income tax (160,199) [2]   782,844 [3] 676,444 [3]  
Equity interest in net result of associated companies (2,198) [2]   (19,073) [3] (15,422) [3]  
Net profit (loss) attributable to equity holders of the parent (1,157,911) [2]   (2,804,630) [3] 4,909,164 [3]  
Assets by segment 87,971,767 [2]   135,862,040 [3] 118,266,380 [3]  
Plant, property and equipment, net 42,674,620 [2]   64,864,986 [3] 62,157,797 [3]  
Revalued of assets 0 [2]   6,159,077 [3] 7,494,408 [3]  
Goodwill 199,984 [2]   5,191,841 [3] 5,436,675 [3]  
Licenses and rights, net 12,965,021 [2]   13,791,003 [3] 12,099,873 [3]  
Investments in associated companies (19,866) [2]   (34,401) [3] (20,970) [3]  
Liabilities by segments 54,393,204 [2]   72,702,285 [3] 61,786,265 [3]  
Operating segments [member] | Colombia [member]          
Disclosure of Operating Segments [Line Items]          
External revenues 70,925,374   79,312,071 77,282,658  
Intersegment revenues 374,225   360,638 352,694  
Total revenues 71,299,599   79,672,709 77,635,352  
Depreciation and amortization 13,085,226   15,067,211 14,413,760  
Operating income 14,170,936   15,165,356 15,111,947  
Interest income 624,304   431,314 822,447  
Interest expense 2,699,010   2,240,707 2,586,708  
Income tax 2,286,809   3,112,946 2,078,789  
Net profit (loss) attributable to equity holders of the parent 6,486,771   5,959,563 16,579,303  
Assets by segment 104,769,670   133,232,525 132,210,369  
Plant, property and equipment, net 44,999,710   48,888,907 48,876,853  
Revalued of assets 7,700,459   10,266,464 12,893,284  
Goodwill 8,495,090   11,685,585 12,253,743  
Licenses and rights, net 8,068,013   11,384,533 12,363,039  
Investments in associated companies 0   351 395  
Liabilities by segments 57,393,854   65,631,866 63,610,642  
Operating segments [member] | Andean [member]          
Disclosure of Operating Segments [Line Items]          
External revenues 55,426,258   52,888,323 53,846,358  
Intersegment revenues 72,142   73,828 88,305  
Total revenues 55,498,400   52,962,151 53,934,663  
Depreciation and amortization 10,698,869   11,211,523 11,447,356  
Operating income 8,262,395   7,457,802 8,698,645  
Interest income 906,176   833,540 1,049,261  
Interest expense 860,572   1,213,421 2,223,478  
Income tax 2,870,743   2,375,281 3,115,693  
Net profit (loss) attributable to equity holders of the parent 6,122,291   4,180,473 4,649,047  
Assets by segment 85,782,831   95,719,937 101,717,708  
Plant, property and equipment, net 33,480,299   34,395,339 36,102,261  
Revalued of assets 5,938,449   8,389,460 9,500,708  
Goodwill 4,678,851   4,688,154 4,866,363  
Licenses and rights, net 4,271,910   5,502,139 6,870,531  
Liabilities by segments 36,223,727   44,676,727 53,379,366  
Operating segments [member] | Central America [member]          
Disclosure of Operating Segments [Line Items]          
External revenues 47,054,127 [4]   45,406,174 [5] 44,823,244 [5]  
Intersegment revenues 160,459 [4]   62,764 [5] (129,419) [5]  
Total revenues 47,214,586 [4]   45,468,938 [5] 44,693,825 [5]  
Depreciation and amortization 11,178,361 [4]   10,830,440 [5] 11,784,026 [5]  
Operating income 7,540,132 [4]   8,700,382 [5] 5,844,137 [5]  
Interest income 431,741 [4]   269,379 [5] 1,130,767 [5]  
Interest expense 1,033,792 [4]   1,061,526 [5] 1,419,010 [5]  
Income tax 1,708,728 [4]   2,940,404 [5] 1,504,240 [5]  
Net profit (loss) attributable to equity holders of the parent 5,059,038 [4]   4,746,847 [5] 3,922,577 [5]  
Assets by segment 96,321,649 [4]   101,725,955 [5] 88,690,683 [5]  
Plant, property and equipment, net 41,312,113 [4]   42,407,727 [5] 37,855,227 [5]  
Revalued of assets 0 [4]   9,113,632 [5] 7,059,247 [5]  
Goodwill 6,312,511 [4]   6,002,380 [5] 6,345,659 [5]  
Licenses and rights, net 3,599,560 [4]   5,220,437 [5] 5,427,857 [5]  
Investments in associated companies 23,896 [4]   26,348 [5] 25,413 [5]  
Liabilities by segments 42,725,447 [4]   42,823,861 [5] 34,252,511 [5]  
Operating segments [member] | Caribbean [member]          
Disclosure of Operating Segments [Line Items]          
External revenues 40,859,951   37,858,979 37,182,842  
Intersegment revenues 1,854,029   2,069,648 1,440,983  
Total revenues 42,713,980   39,928,627 38,623,825  
Depreciation and amortization 7,133,908   6,987,129 7,094,331  
Operating income 10,284,834   8,661,475 6,701,086  
Interest income 701,794   701,785 1,105,420  
Interest expense 1,152,370   1,066,733 1,658,619  
Income tax 2,432,392   2,171,594 2,524,214  
Net profit (loss) attributable to equity holders of the parent 6,649,004   5,151,166 3,294,111  
Assets by segment 101,143,182   102,949,901 109,914,293  
Plant, property and equipment, net 40,606,623   41,601,009 39,128,447  
Revalued of assets 1,434,188   2,564,149 2,572,504  
Goodwill 14,186,723   14,186,723 14,186,723  
Trademarks, net 220,350   229,000 219,087  
Licenses and rights, net 10,124,134   10,847,685 8,616,880  
Liabilities by segments 48,434,551   53,885,848 60,839,340  
Operating segments [member] | Europe [member]          
Disclosure of Operating Segments [Line Items]          
External revenues 105,956,056   113,838,486 111,472,191  
Total revenues 105,956,056   113,838,486 111,472,191  
Depreciation and amortization 22,761,938   27,469,463 25,593,204  
Operating income 16,155,520   13,421,147 13,159,865  
Interest income 229,958   116,031 90,746  
Interest expense 1,281,857   2,414,415 2,546,255  
Income tax 3,151,281   3,438,161 2,234,065  
Equity interest in net result of associated companies (39,490)   (1,757) (288,747)  
Net profit (loss) attributable to equity holders of the parent 11,795,662   8,313,018 7,777,426  
Assets by segment 154,774,150   210,944,575 239,583,759  
Plant, property and equipment, net 72,272,633   79,764,422 82,595,077  
Revalued of assets 23,280,623   28,675,224 31,556,270  
Goodwill 49,465,916   52,307,190 53,388,139  
Trademarks, net 2,565,176   2,822,625 2,981,089  
Licenses and rights, net 20,461,281   25,709,849 27,963,250  
Investments in associated companies 2,058        
Liabilities by segments 97,527,392   134,357,142 138,747,621  
Eliminations [member]          
Disclosure of Operating Segments [Line Items]          
Intersegment revenues (33,670,310)   (39,190,670) (38,511,918)  
Total revenues (33,670,310)   (39,190,670) (38,511,918)  
Depreciation and amortization (9,138)   (3,729,626) (3,202,787)  
Operating income (6,886,979)   (9,570,359) (11,200,502)  
Interest income (20,730,921)   (17,065,290) (25,823,043)  
Interest expense (20,005,724)   (16,895,379) (25,443,493)  
Income tax (109,785)   1,548 4,283  
Net profit (loss) attributable to equity holders of the parent continues operations (25,669,919)   (10,334,660) (13,359,095)  
Net profit (loss) attributable to equity holders of the parent (25,669,919)   (10,334,660) (13,359,095)  
Assets by segment (678,859,545)   (693,615,163) (737,878,785)  
Plant, property and equipment, net (462,650)   (983,169) (876,229)  
Investments in associated companies (1,260,122)   (2,253,198) 1,095,703  
Liabilities by segments $ (279,439,292)   $ (308,257,878) $ (319,064,971)  
[1] Restated for discontinued operations
[2] Discontinued operations (Claro Chile, SpA joint venture)
[3] Restated for discontinued operations (Claro Chile, SpA joint venture)
[4] Discontinued operations (Panama disposal)
[5] Restated for discontinued operations (Panama disposal)
[6] Restated for discontinued operations (TracFone disposal)