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Segments - Summary of Operating Segments (Detail) $ in Thousands, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 MXN ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2016 MXN ($)
Disclosure of Operating Segments [Line Items] |  |  |  |  |  |
External revenues | $ 1,007,347,869 |  | $ 1,038,207,681 | $ 1,021,633,535 |  |
Total revenues | 1,007,347,869 | $ 53,454 | 1,038,207,681 | 1,021,633,535 |  |
Depreciation and amortization | 158,915,210 | 8,433 | 155,712,580 | 160,174,942 |  |
Operating income | 154,840,535 |  | 139,557,171 | 100,143,303 |  |
Interest income | 6,284,672 | 333 | 10,646,169 | 2,925,648 |  |
Interest expense | 37,911,339 | 2,012 | 31,771,433 | 30,300,781 |  |
Income tax | 51,033,533 | 2,708 | 46,477,079 | 24,941,511 |  |
Equity interest in net income (loss) of associated companies | (17,609) |  | 267 | 91,385 |  |
Net profit (loss) attributable to equity holders of the parent | 67,730,891 | $ 3,594 | 52,566,197 | 29,325,921 |  |
Assets by segment | 1,531,933,657 |  | 1,429,223,392 | 1,486,211,852 | $ 81,291 |
Plant, property and equipment, net | 639,343,370 |  | 640,000,720 | 676,343,198 | 33,926 | $ 701,190,066
Goodwill | 152,899,801 |  | 145,566,497 | 151,463,232 | 8,113 |
Trademarks, net | 3,488,709 |  | 4,667,205 | 9,937,807 |  |
Licenses and rights, net | 104,848,545 |  | 103,298,395 | 113,304,386 |  |
Investment in associated companies | 2,474,193 |  | 3,132,707 | 3,735,172 | 131 |
Liabilities by segments | 1,305,026,792 |  | 1,183,350,970 | 1,225,578,335 | $ 69,249 |
Operating segments [member] | Mexico [member] |  |  |  |  |  |
Disclosure of Operating Segments [Line Items] |  |  |  |  |  |
External revenues | 226,164,232 |  | 207,610,244 | 190,022,612 |  |
Intersegment revenues | 11,676,015 |  | 16,946,543 | 16,748,428 |  |
Total revenues | 237,840,247 |  | 224,556,787 | 206,771,040 |  |
Depreciation and amortization | 24,742,622 |  | 17,619,342 | 17,030,251 |  |
Operating income | 67,694,409 |  | 57,450,599 | 50,666,028 |  |
Interest income | 23,713,455 |  | 26,578,280 | 30,083,437 |  |
Interest expense | 30,972,658 |  | 32,526,258 | 32,185,868 |  |
Income tax | 30,000,511 |  | 28,842,505 | 18,142,482 |  |
Equity interest in net income (loss) of associated companies | (3,732) |  | (5,962) | 99,044 |  |
Net profit (loss) attributable to equity holders of the parent | 42,598,946 |  | 23,185,029 | 26,321,442 |  |
Assets by segment | 915,233,048 |  | 970,564,314 | 1,033,036,406 |  |
Plant, property and equipment, net | 54,589,459 |  | 56,056,634 | 59,137,555 |  |
Goodwill | 27,396,393 |  | 27,104,632 | 27,102,384 |  |
Trademarks, net | 46,476 |  | 227,774 | 406,723 |  |
Licenses and rights, net | 11,087,882 |  | 10,573,147 | 11,457,720 |  |
Investment in associated companies | 3,562,323 |  | 5,621,661 | 469,662 |  |
Liabilities by segments | 718,354,229 |  | 748,965,728 | 794,598,013 |  |
Operating segments [member] | Telmex [member] |  |  |  |  |  |
Disclosure of Operating Segments [Line Items] |  |  |  |  |  |
External revenues | 84,173,980 |  | 86,339,289 | 89,731,238 |  |
Intersegment revenues | 11,863,364 |  | 9,741,908 | 8,753,525 |  |
Total revenues | 96,037,344 |  | 96,081,197 | 98,484,763 |  |
Depreciation and amortization | 16,346,927 |  | 18,358,248 | 18,902,238 |  |
Operating income | 9,731,852 |  | 8,085,764 | 7,921,524 |  |
Interest income | 1,839,973 |  | 420,380 | 619,748 |  |
Interest expense | 1,439,785 |  | 1,153,913 | 1,028,593 |  |
Income tax | 1,528,229 |  | 643,377 | 387,145 |  |
Equity interest in net income (loss) of associated companies | 46,789 |  | 44,965 | 16,564 |  |
Net profit (loss) attributable to equity holders of the parent | (1,705,068) |  | (2,201,572) | 184,387 |  |
Assets by segment | 201,283,526 |  | 174,461,398 | 170,402,561 |  |
Plant, property and equipment, net | 106,869,482 |  | 103,737,293 | 109,713,770 |  |
Goodwill | 215,381 |  | 215,381 | 213,926 |  |
Trademarks, net | 212,324 |  | 243,556 | 274,786 |  |
Licenses and rights, net | 452,504 |  |  | 13,175 |  |
Investment in associated companies | 610,807 |  | 563,667 | 546,872 |  |
Liabilities by segments | 175,774,964 |  | 136,993,838 | 133,428,178 |  |
Operating segments [member] | Brazil [member] |  |  |  |  |  |
Disclosure of Operating Segments [Line Items] |  |  |  |  |  |
External revenues | 177,596,077 |  | 188,712,666 | 210,536,673 |  |
Intersegment revenues | 4,182,248 |  | 4,593,760 | 4,785,601 |  |
Total revenues | 181,778,325 |  | 193,306,426 | 215,322,274 |  |
Depreciation and amortization | 39,424,474 |  | 42,857,751 | 51,486,652 |  |
Operating income | 28,846,565 |  | 23,494,903 | 11,601,369 |  |
Interest income | 3,155,681 |  | 11,303,888 | 3,792,242 |  |
Interest expense | 19,021,965 |  | 20,377,191 | 23,578,083 |  |
Income tax | 4,251,116 |  | 4,026,444 | (2,991,377) |  |
Equity interest in net income (loss) of associated companies | (1,538) |  | (152) | (232) |  |
Net profit (loss) attributable to equity holders of the parent | 5,618,095 |  | 3,530,653 | (6,617,381) |  |
Assets by segment | 382,561,753 |  | 390,791,480 | 428,281,963 |  |
Plant, property and equipment, net | 174,761,167 |  | 173,197,708 | 187,459,628 |  |
Goodwill | 25,379,805 |  | 21,388,124 | 24,708,739 |  |
Trademarks, net | 37,207 |  | 124,910 | 246,557 |  |
Licenses and rights, net | 29,324,718 |  | 25,873,910 | 35,662,305 |  |
Investment in associated companies | 111,073 |  | 543 | 640 |  |
Liabilities by segments | 297,877,328 |  | 298,308,084 | 322,620,030 |  |
Operating segments [member] | Southern Cone [member] |  |  |  |  |  |
Disclosure of Operating Segments [Line Items] |  |  |  |  |  |
External revenues | 54,230,682 |  | 89,149,978 | 81,092,885 |  |
Intersegment revenues | 11,041,705 |  | 13,200,358 | 1,250,983 |  |
Total revenues | 65,272,387 |  | 102,350,336 | 82,343,868 |  |
Depreciation and amortization | 13,847,506 |  | 13,526,361 | 10,639,591 |  |
Operating income | 4,007,614 |  | 16,975,797 | 11,676,427 |  |
Interest income | 896,256 |  | 2,251,474 | 2,884,613 |  |
Interest expense | 3,849,318 |  | 4,338,941 | 4,637,989 |  |
Income tax | 2,022,336 |  | 1,390,039 | 3,535,302 |  |
Equity interest in net income (loss) of associated companies | (23,424) |  | (20,871) | (9,801) |  |
Net profit (loss) attributable to equity holders of the parent | (6,984) |  | 6,065,703 | 4,421,938 |  |
Assets by segment | 132,722,497 |  | 127,946,573 | 133,136,177 |  |
Plant, property and equipment, net | 60,537,650 |  | 62,988,635 | 69,006,093 |  |
Goodwill | 5,241,305 |  | 2,796,759 | 3,073,444 |  |
Licenses and rights, net | 12,103,980 |  | 12,555,496 | 8,885,086 |  |
Investment in associated companies | (7,806) |  | 20,697 | 63,110 |  |
Liabilities by segments | 103,330,525 |  | 94,550,901 | 119,123,646 |  |
Operating segments [member] | Colombia [member] |  |  |  |  |  |
Disclosure of Operating Segments [Line Items] |  |  |  |  |  |
External revenues | 74,274,684 |  | 75,460,428 | 72,435,460 |  |
Intersegment revenues | 361,386 |  | 344,517 | 304,555 |  |
Total revenues | 74,636,070 |  | 75,804,945 | 72,740,015 |  |
Depreciation and amortization | 13,439,489 |  | 13,464,867 | 12,373,790 |  |
Operating income | 15,324,977 |  | 14,388,552 | (4,704,165) |  |
Interest income | 1,306,571 |  | 1,013,839 | 211,521 |  |
Interest expense | 2,952,123 |  | 2,913,881 | 1,955,688 |  |
Income tax | 5,405,452 |  | 2,251,877 | (1,874,594) |  |
Net profit (loss) attributable to equity holders of the parent | 9,571,046 |  | 9,165,801 | (6,209,530) |  |
Assets by segment | 115,851,227 |  | 111,975,598 | 108,362,023 |  |
Plant, property and equipment, net | 50,133,642 |  | 51,422,548 | 57,060,931 |  |
Goodwill | 12,124,685 |  | 12,770,380 | 13,981,033 |  |
Licenses and rights, net | 5,530,422 |  | 3,400,235 | 4,197,498 |  |
Investment in associated companies | 391 |  | 412 | 451 |  |
Liabilities by segments | 55,576,253 |  | 56,211,438 | 54,756,152 |  |
Operating segments [member] | Andean [member] |  |  |  |  |  |
Disclosure of Operating Segments [Line Items] |  |  |  |  |  |
External revenues | 55,440,675 |  | 55,633,192 | 56,393,595 |  |
Intersegment revenues | 92,249 |  | 154,082 | 177,856 |  |
Total revenues | 55,532,924 |  | 55,787,274 | 56,571,451 |  |
Depreciation and amortization | 10,256,129 |  | 8,516,960 | 8,328,705 |  |
Operating income | 8,023,002 |  | 5,003,915 | 5,650,477 |  |
Interest income | 1,283,788 |  | 1,666,879 | 1,793,974 |  |
Interest expense | 2,422,887 |  | 1,719,663 | 1,573,929 |  |
Income tax | 1,681,159 |  | 2,498,666 | 1,806,085 |  |
Net profit (loss) attributable to equity holders of the parent | (2,604,646) |  | 1,730,933 | 1,595,382 |  |
Assets by segment | 94,021,632 |  | 96,347,779 | 113,478,626 |  |
Plant, property and equipment, net | 39,068,450 |  | 35,800,477 | 35,930,966 |  |
Goodwill | 4,895,331 |  | 5,242,365 | 6,113,495 |  |
Licenses and rights, net | 8,064,487 |  | 9,651,582 | 11,295,202 |  |
Liabilities by segments | 55,463,339 |  | 50,064,761 | 48,656,628 |  |
Operating segments [member] | Central America [member] |  |  |  |  |  |
Disclosure of Operating Segments [Line Items] |  |  |  |  |  |
External revenues | 46,602,036 |  | 44,883,585 | 44,094,835 |  |
Intersegment revenues | 132,061 |  | 149,445 | 187,086 |  |
Total revenues | 46,734,097 |  | 45,033,030 | 44,281,921 |  |
Depreciation and amortization | 11,045,817 |  | 8,940,655 | 9,668,439 |  |
Operating income | 5,712,068 |  | 4,867,763 | 5,252,401 |  |
Interest income | 532,046 |  | 1,566,086 | 1,064,992 |  |
Interest expense | 1,406,720 |  | 509,081 | 485,684 |  |
Income tax | 2,355,380 |  | 2,533,600 | 2,025,618 |  |
Equity interest in net income (loss) of associated companies | (28,795) |  |  |  |  |
Net profit (loss) attributable to equity holders of the parent | 2,335,963 |  | 2,821,733 | 3,713,301 |  |
Assets by segment | 77,355,732 |  | 81,640,157 | 81,529,691 |  |
Plant, property and equipment, net | 38,934,747 |  | 37,146,601 | 39,050,481 |  |
Goodwill | 7,289,748 |  | 5,466,871 | 5,597,990 |  |
Licenses and rights, net | 4,390,547 |  | 3,605,416 | 3,376,106 |  |
Investment in associated companies | 25,603 |  | 24,262 | 16,999 |  |
Liabilities by segments | 37,993,180 |  | 28,592,953 | 35,501,900 |  |
Operating segments [member] | U.S.A [member] |  |  |  |  |  |
Disclosure of Operating Segments [Line Items] |  |  |  |  |  |
External revenues | 155,864,392 |  | 153,266,315 | 148,589,487 |  |
Intersegment revenues |  |  |  | 44 |  |
Total revenues | 155,864,392 |  | 153,266,315 | 148,589,531 |  |
Depreciation and amortization | 1,396,422 |  | 1,545,395 | 1,594,727 |  |
Operating income | 2,968,236 |  | 2,665,270 | 2,915,123 |  |
Interest income | 324,932 |  | 559,548 | 394,196 |  |
Interest expense | 385 |  |  |  |  |
Income tax | 1,119,478 |  | 810,898 | 1,803,555 |  |
Net profit (loss) attributable to equity holders of the parent | 2,095,807 |  | 2,820,505 | 1,793,875 |  |
Assets by segment | 30,775,893 |  | 38,814,907 | 40,761,830 |  |
Plant, property and equipment, net | 1,405,755 |  | 1,356,237 | 1,693,642 |  |
Goodwill | 3,220,105 |  | 3,328,533 | 3,341,956 |  |
Trademarks, net | 369,950 |  | 507,033 | 631,024 |  |
Liabilities by segments | 31,557,816 |  | 35,552,678 | 38,249,957 |  |
Operating segments [member] | Caribbean [member] |  |  |  |  |  |
Disclosure of Operating Segments [Line Items] |  |  |  |  |  |
External revenues | 34,580,822 |  | 36,435,541 | 35,092,578 |  |
Intersegment revenues | 1,136,879 |  | 204,294 | 122,656 |  |
Total revenues | 35,717,701 |  | 36,639,835 | 35,215,234 |  |
Depreciation and amortization | 6,322,648 |  | 5,036,831 | 5,349,757 |  |
Operating income | 5,741,368 |  | 5,811,846 | 4,752,168 |  |
Interest income | 1,478,560 |  | 1,458,874 | 1,111,980 |  |
Interest expense | 1,435,862 |  | 561,867 | 377,727 |  |
Income tax | 719,774 |  | 2,774,204 | 3,529,253 |  |
Net profit (loss) attributable to equity holders of the parent | 4,312,630 |  | 3,644,697 | 1,262,073 |  |
Assets by segment | 100,694,650 |  | 102,531,547 | 88,672,466 |  |
Plant, property and equipment, net | 38,223,641 |  | 38,011,242 | 32,173,524 |  |
Goodwill | 14,186,723 |  | 14,186,723 | 14,186,723 |  |
Trademarks, net | 227,156 |  | 249,984 | 262,641 |  |
Licenses and rights, net | 7,942,670 |  | 10,294,336 | 7,276,039 |  |
Liabilities by segments | 54,276,868 |  | 58,716,154 | 43,978,410 |  |
Operating segments [member] | Europe [member] |  |  |  |  |  |
Disclosure of Operating Segments [Line Items] |  |  |  |  |  |
External revenues | 98,420,289 |  | 100,716,443 | 93,644,172 |  |
Total revenues | 98,420,289 |  | 100,716,443 | 93,644,172 |  |
Depreciation and amortization | 24,975,146 |  | 26,838,972 | 25,222,962 |  |
Operating income | 8,687,862 |  | 4,731,562 | 4,523,857 |  |
Interest income | 115,359 |  | 122,133 | 307,021 |  |
Interest expense | 2,220,168 |  | 1,973,431 | 2,035,716 |  |
Income tax | 1,946,255 |  | 707,093 | (1,417,358) |  |
Equity interest in net income (loss) of associated companies | (6,909) |  | (17,713) | (14,190) |  |
Net profit (loss) attributable to equity holders of the parent | 5,051,145 |  | 3,809,694 | 5,656,132 |  |
Assets by segment | 191,744,924 |  | 186,135,358 | 203,858,243 |  |
Plant, property and equipment, net | 75,707,738 |  | 80,421,642 | 85,116,608 |  |
Goodwill | 52,950,325 |  | 53,066,729 | 53,143,542 |  |
Trademarks, net | 2,595,596 |  | 3,313,948 | 8,116,076 |  |
Licenses and rights, net | 25,951,335 |  | 27,344,273 | 31,141,255 |  |
Investment in associated companies |  |  | 748,674 | 806,950 |  |
Liabilities by segments | 124,319,541 |  | 117,214,746 | 119,240,533 |  |
Eliminations [member] |  |  |  |  |  |
Disclosure of Operating Segments [Line Items] |  |  |  |  |  |
Intersegment revenues | (40,485,907) |  | (45,334,907) | (32,330,734) |  |
Total revenues | (40,485,907) |  | (45,334,907) | (32,330,734) |  |
Depreciation and amortization | (2,881,970) |  | (992,802) | (422,170) |  |
Operating income | (1,897,418) |  | (3,918,800) | (111,906) |  |
Interest income | (28,361,949) |  | (36,295,212) | (39,338,076) |  |
Interest expense | (27,810,532) |  | (34,302,793) | (37,558,496) |  |
Income tax | 3,843 |  | (1,624) | (4,600) |  |
Net profit (loss) attributable to equity holders of the parent | 463,957 |  | (2,006,979) | (2,795,698) |  |
Assets by segment | (710,311,225) |  | (851,985,719) | (915,308,134) |  |
Plant, property and equipment, net | (888,361) |  | (138,297) |  |  |
Investment in associated companies | (1,828,198) |  | (3,847,209) | 1,830,488 |  |
Liabilities by segments | $ (349,497,251) |  | $ (441,820,311) | $ (484,575,112) |  |

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