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Segments - Summary of Operating Segments (Detail) $ in Thousands, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 MXN ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2015 MXN ($)
Disclosure of Operating Segments [Line Items] |  |  |  |  |  |
External revenues | $ 1,038,207,681 |  | $ 1,021,633,535 | $ 975,412,488 |  |
Total revenues | 1,038,207,681 | $ 52,747 | 1,021,633,535 | 975,412,488 |  |
Depreciation and amortization | 155,712,580 | 7,911 | 160,174,942 | 148,525,921 |  |
Operating income | 139,557,171 |  | 100,143,303 | 109,610,310 |  |
Interest income | 10,646,169 | 541 | 2,925,648 | 4,192,595 |  |
Interest expense | 31,771,433 | 1,614 | 30,300,781 | 33,862,012 |  |
Income tax | 46,477,079 | 2,361 | 24,941,511 | 11,398,856 |  |
Equity interest in net income (loss) of associated companies | 267 |  | 91,385 | 189,950 |  |
Net profit (loss) attributable to equity holders of the parent | 52,566,197 | $ 2,670 | 29,325,921 | 8,649,427 |  |
Assets by segment | 1,429,223,392 |  | 1,486,211,852 | 1,515,042,274 | $ 72,613 |
Plant, property and equipment, net | 640,000,720 |  | 676,343,198 | 701,190,066 | 32,516 | $ 573,528,878
Goodwill | 145,566,497 |  | 151,463,232 | 152,632,635 | 7,396 |
Trademarks, net | 4,667,205 |  | 9,937,807 | 12,566,893 |  |
Licenses and rights, net | 103,298,395 |  | 113,304,386 | 116,031,264 |  |
Investment in associated companies | 3,132,707 |  | 3,735,172 | 3,603,484 | 159 |
Liabilities by segments | 1,183,350,970 |  | 1,225,578,335 | 1,244,018,507 | $ 60,121 |
Operating segments [member] | Mexico [member] |  |  |  |  |  |
Disclosure of Operating Segments [Line Items] |  |  |  |  |  |
External revenues | 207,610,244 |  | 190,022,612 | 187,127,903 |  |
Intersegment revenues | 16,946,543 |  | 16,748,428 | 16,438,858 |  |
Total revenues | 224,556,787 |  | 206,771,040 | 203,566,761 |  |
Depreciation and amortization | 17,619,342 |  | 17,030,251 | 16,451,496 |  |
Operating income | 57,450,599 |  | 50,666,028 | 48,219,505 |  |
Interest income | 26,578,280 |  | 30,083,437 | 28,659,372 |  |
Interest expense | 32,526,258 |  | 32,185,868 | 32,004,944 |  |
Income tax | 28,842,505 |  | 18,142,482 | 2,502,242 |  |
Equity interest in net income (loss) of associated companies | (5,962) |  | 99,044 | 67,472 |  |
Net profit (loss) attributable to equity holders of the parent | 23,185,029 |  | 26,321,442 | 378,150 |  |
Assets by segment | 970,564,314 |  | 1,033,036,406 | 1,070,598,204 |  |
Plant, property and equipment, net | 56,056,634 |  | 59,137,555 | 64,893,242 |  |
Goodwill | 27,104,632 |  | 27,102,384 | 27,186,328 |  |
Trademarks, net | 227,774 |  | 406,723 | 615,318 |  |
Licenses and rights, net | 10,573,147 |  | 11,457,720 | 5,887,092 |  |
Investment in associated companies | 5,621,661 |  | 469,662 | 7,605,220 |  |
Liabilities by segments | 748,965,728 |  | 794,598,013 | 798,044,609 |  |
Operating segments [member] | Telmex [member] |  |  |  |  |  |
Disclosure of Operating Segments [Line Items] |  |  |  |  |  |
External revenues | 86,339,289 |  | 89,731,238 | 93,343,612 |  |
Intersegment revenues | 9,741,908 |  | 8,753,525 | 8,872,248 |  |
Total revenues | 96,081,197 |  | 98,484,763 | 102,215,860 |  |
Depreciation and amortization | 18,358,248 |  | 18,902,238 | 17,150,013 |  |
Operating income | 8,085,764 |  | 7,921,524 | 12,275,892 |  |
Interest income | 420,380 |  | 619,748 | 303,915 |  |
Interest expense | 1,153,913 |  | 1,028,593 | 1,135,552 |  |
Income tax | 643,377 |  | 387,145 | 921,803 |  |
Equity interest in net income (loss) of associated companies | 44,965 |  | 16,564 | 116,368 |  |
Net profit (loss) attributable to equity holders of the parent | (2,201,572) |  | 184,387 | 902,282 |  |
Assets by segment | 174,461,398 |  | 170,402,561 | 161,133,722 |  |
Plant, property and equipment, net | 103,737,293 |  | 109,713,770 | 112,220,236 |  |
Goodwill | 215,381 |  | 213,926 | 213,926 |  |
Trademarks, net | 243,556 |  | 274,786 | 307,881 |  |
Licenses and rights, net |  |  | 13,175 | 42,867 |  |
Investment in associated companies | 563,667 |  | 546,872 | 2,218,824 |  |
Liabilities by segments | 136,993,838 |  | 133,428,178 | 117,663,161 |  |
Operating segments [member] | Brazil [member] |  |  |  |  |  |
Disclosure of Operating Segments [Line Items] |  |  |  |  |  |
External revenues | 188,712,666 |  | 210,536,673 | 193,796,237 |  |
Intersegment revenues | 4,593,760 |  | 4,785,601 | 3,560,388 |  |
Total revenues | 193,306,426 |  | 215,322,274 | 197,356,625 |  |
Depreciation and amortization | 42,857,751 |  | 51,486,652 | 47,170,935 |  |
Operating income | 23,494,903 |  | 11,601,369 | 6,325,323 |  |
Interest income | 11,303,888 |  | 3,792,242 | 3,747,684 |  |
Interest expense | 20,377,191 |  | 23,578,083 | 22,970,335 |  |
Income tax | 4,026,444 |  | (2,991,377) | (4,294,040) |  |
Equity interest in net income (loss) of associated companies | (152) |  | (232) | (270) |  |
Net profit (loss) attributable to equity holders of the parent | 3,530,653 |  | (6,617,381) | (10,357,493) |  |
Assets by segment | 390,791,480 |  | 428,281,963 | 461,831,754 |  |
Plant, property and equipment, net | 173,197,708 |  | 187,459,628 | 203,270,555 |  |
Goodwill | 21,388,124 |  | 24,708,739 | 26,106,622 |  |
Trademarks, net | 124,910 |  | 246,557 | 366,727 |  |
Licenses and rights, net | 25,873,910 |  | 35,662,305 | 41,496,209 |  |
Investment in associated companies | 543 |  | 640 | 699 |  |
Liabilities by segments | 298,308,084 |  | 322,620,030 | 349,915,118 |  |
Operating segments [member] | Southern Cone [member] |  |  |  |  |  |
Disclosure of Operating Segments [Line Items] |  |  |  |  |  |
External revenues | 89,149,978 |  | 81,092,885 | 71,553,356 |  |
Intersegment revenues | 13,200,358 |  | 1,250,983 | 776,719 |  |
Total revenues | 102,350,336 |  | 82,343,868 | 72,330,075 |  |
Depreciation and amortization | 13,526,361 |  | 10,639,591 | 9,739,634 |  |
Operating income | 16,975,797 |  | 11,676,427 | 8,317,053 |  |
Interest income | 2,251,474 |  | 2,884,613 | 2,649,539 |  |
Interest expense | 4,338,941 |  | 4,637,989 | 5,049,457 |  |
Income tax | 1,390,039 |  | 3,535,302 | 2,021,090 |  |
Equity interest in net income (loss) of associated companies | (20,871) |  | (9,801) | (23,319) |  |
Net profit (loss) attributable to equity holders of the parent | 6,065,703 |  | 4,421,938 | 3,765,015 |  |
Assets by segment | 127,946,573 |  | 133,136,177 | 140,617,162 |  |
Plant, property and equipment, net | 62,988,635 |  | 69,006,093 | 67,023,143 |  |
Goodwill | 2,796,759 |  | 3,073,444 | 3,006,448 |  |
Licenses and rights, net | 12,555,496 |  | 8,885,086 | 8,760,860 |  |
Investment in associated companies | 20,697 |  | 63,110 | 81,284 |  |
Liabilities by segments | 94,550,901 |  | 119,123,646 | 124,149,687 |  |
Operating segments [member] | Columbia [member] |  |  |  |  |  |
Disclosure of Operating Segments [Line Items] |  |  |  |  |  |
External revenues | 75,460,428 |  | 72,435,460 | 67,330,768 |  |
Intersegment revenues | 344,517 |  | 304,555 | 257,767 |  |
Total revenues | 75,804,945 |  | 72,740,015 | 67,588,535 |  |
Depreciation and amortization | 13,464,867 |  | 12,373,790 | 11,283,749 |  |
Operating income | 14,388,552 |  | (4,704,165) | 11,209,959 |  |
Interest income | 1,013,839 |  | 211,521 | 104,304 |  |
Interest expense | 2,913,881 |  | 1,955,688 | 1,079,989 |  |
Income tax | 2,251,877 |  | (1,874,594) | 4,456,750 |  |
Net profit (loss) attributable to equity holders of the parent | 9,165,801 |  | (6,209,530) | 4,022,633 |  |
Assets by segment | 111,975,598 |  | 108,362,023 | 103,361,235 |  |
Plant, property and equipment, net | 51,422,548 |  | 57,060,931 | 59,690,886 |  |
Goodwill | 12,770,380 |  | 13,981,033 | 14,659,891 |  |
Trademarks, net |  |  |  | 194 |  |
Licenses and rights, net | 3,400,235 |  | 4,197,498 | 4,603,793 |  |
Investment in associated companies | 412 |  | 451 | 470 |  |
Liabilities by segments | 56,211,438 |  | 54,756,152 | 40,811,337 |  |
Operating segments [member] | Andean [member] |  |  |  |  |  |
Disclosure of Operating Segments [Line Items] |  |  |  |  |  |
External revenues | 55,633,192 |  | 56,393,595 | 55,825,972 |  |
Intersegment revenues | 154,082 |  | 177,856 | 304,834 |  |
Total revenues | 55,787,274 |  | 56,571,451 | 56,130,806 |  |
Depreciation and amortization | 8,516,960 |  | 8,328,705 | 7,764,474 |  |
Operating income | 5,003,915 |  | 5,650,477 | 6,086,638 |  |
Interest income | 1,666,879 |  | 1,793,974 | 944,945 |  |
Interest expense | 1,719,663 |  | 1,573,929 | 1,147,380 |  |
Income tax | 2,498,666 |  | 1,806,085 | 1,768,066 |  |
Net profit (loss) attributable to equity holders of the parent | 1,730,933 |  | 1,595,382 | 3,621,863 |  |
Assets by segment | 96,347,779 |  | 113,478,626 | 113,839,981 |  |
Plant, property and equipment, net | 35,800,477 |  | 35,930,966 | 37,716,772 |  |
Goodwill | 5,242,365 |  | 6,113,495 | 5,948,335 |  |
Licenses and rights, net | 9,651,582 |  | 11,295,202 | 12,882,210 |  |
Liabilities by segments | 50,064,761 |  | 48,656,628 | 52,949,608 |  |
Operating segments [member] | Central America [member] |  |  |  |  |  |
Disclosure of Operating Segments [Line Items] |  |  |  |  |  |
External revenues | 44,883,585 |  | 44,094,835 | 42,131,666 |  |
Intersegment revenues | 149,445 |  | 187,086 | 289,465 |  |
Total revenues | 45,033,030 |  | 44,281,921 | 42,421,131 |  |
Depreciation and amortization | 8,940,655 |  | 9,668,439 | 10,474,681 |  |
Operating income | 4,867,763 |  | 5,252,401 | 3,830,974 |  |
Interest income | 1,566,086 |  | 1,064,992 | 462,779 |  |
Interest expense | 509,081 |  | 485,684 | 411,597 |  |
Income tax | 2,533,600 |  | 2,025,618 | 3,291,776 |  |
Equity interest in net income (loss) of associated companies |  |  |  | 171 |  |
Net profit (loss) attributable to equity holders of the parent | 2,821,733 |  | 3,713,301 | 538,890 |  |
Assets by segment | 81,640,157 |  | 81,529,691 | 80,832,029 |  |
Plant, property and equipment, net | 37,146,601 |  | 39,050,481 | 41,808,573 |  |
Goodwill | 5,466,871 |  | 5,597,990 | 5,652,268 |  |
Licenses and rights, net | 3,605,416 |  | 3,376,106 | 3,993,120 |  |
Investment in associated companies | 24,262 |  | 16,999 | 17,390 |  |
Liabilities by segments | 28,592,953 |  | 35,501,900 | 38,095,161 |  |
Operating segments [member] | U.S.A [member] |  |  |  |  |  |
Disclosure of Operating Segments [Line Items] |  |  |  |  |  |
External revenues | 153,266,315 |  | 148,589,487 | 140,856,365 |  |
Intersegment revenues |  |  | 44 |  |  |
Total revenues | 153,266,315 |  | 148,589,531 | 140,856,365 |  |
Depreciation and amortization | 1,545,395 |  | 1,594,727 | 1,073,623 |  |
Operating income | 2,665,270 |  | 2,915,123 | 1,220,601 |  |
Interest income | 559,548 |  | 394,196 | 239,797 |  |
Income tax | 810,898 |  | 1,803,555 | 767,295 |  |
Net profit (loss) attributable to equity holders of the parent | 2,820,505 |  | 1,793,875 | 987,790 |  |
Assets by segment | 38,814,907 |  | 40,761,830 | 42,812,349 |  |
Plant, property and equipment, net | 1,356,237 |  | 1,693,642 | 1,949,166 |  |
Goodwill | 3,328,533 |  | 3,341,956 | 3,464,217 |  |
Trademarks, net | 507,033 |  | 631,024 | 788,228 |  |
Liabilities by segments | 35,552,678 |  | 38,249,957 | 41,369,767 |  |
Operating segments [member] | Caribbean [member] |  |  |  |  |  |
Disclosure of Operating Segments [Line Items] |  |  |  |  |  |
External revenues | 36,435,541 |  | 35,092,578 | 36,467,781 |  |
Intersegment revenues | 204,294 |  | 122,656 | 30,210 |  |
Total revenues | 36,639,835 |  | 35,215,234 | 36,497,991 |  |
Depreciation and amortization | 5,036,831 |  | 5,349,757 | 5,225,498 |  |
Operating income | 5,811,846 |  | 4,752,168 | 6,143,183 |  |
Interest income | 1,458,874 |  | 1,111,980 | 691,132 |  |
Interest expense | 561,867 |  | 377,727 | 143,322 |  |
Income tax | 2,774,204 |  | 3,529,253 | 2,542,080 |  |
Net profit (loss) attributable to equity holders of the parent | 3,644,697 |  | 1,262,073 | 3,318,960 |  |
Assets by segment | 102,531,547 |  | 88,672,466 | 93,941,695 |  |
Plant, property and equipment, net | 38,011,242 |  | 32,173,524 | 33,854,428 |  |
Goodwill | 14,186,723 |  | 14,186,723 | 14,186,723 |  |
Trademarks, net | 249,984 |  | 262,641 | 284,665 |  |
Licenses and rights, net | 10,294,336 |  | 7,276,039 | 7,694,798 |  |
Liabilities by segments | 58,716,154 |  | 43,978,410 | 44,790,656 |  |
Operating segments [member] | Europe [member] |  |  |  |  |  |
Disclosure of Operating Segments [Line Items] |  |  |  |  |  |
External revenues | 100,716,443 |  | 93,644,172 | 86,978,828 |  |
Total revenues | 100,716,443 |  | 93,644,172 | 86,978,828 |  |
Depreciation and amortization | 26,838,972 |  | 25,222,962 | 22,525,050 |  |
Operating income | 4,731,562 |  | 4,523,857 | 5,388,595 |  |
Interest income | 122,133 |  | 307,021 | 286,784 |  |
Interest expense | 1,973,431 |  | 2,035,716 | 2,953,033 |  |
Income tax | 707,093 |  | (1,417,358) | (2,578,206) |  |
Equity interest in net income (loss) of associated companies | (17,713) |  | (14,190) | 29,528 |  |
Net profit (loss) attributable to equity holders of the parent | 3,809,694 |  | 5,656,132 | 7,065,769 |  |
Assets by segment | 186,135,358 |  | 203,858,243 | 227,288,156 |  |
Plant, property and equipment, net | 80,421,642 |  | 85,116,608 | 78,763,065 |  |
Goodwill | 53,066,729 |  | 53,143,542 | 52,207,877 |  |
Trademarks, net | 3,313,948 |  | 8,116,076 | 10,203,880 |  |
Licenses and rights, net | 27,344,273 |  | 31,141,255 | 30,670,315 |  |
Investment in associated companies | 748,674 |  | 806,950 | 1,072,778 |  |
Liabilities by segments | 117,214,746 |  | 119,240,533 | 121,928,202 |  |
Eliminations [member] |  |  |  |  |  |
Disclosure of Operating Segments [Line Items] |  |  |  |  |  |
Intersegment revenues | (45,334,907) |  | (32,330,734) | (30,530,489) |  |
Total revenues | (45,334,907) |  | (32,330,734) | (30,530,489) |  |
Depreciation and amortization | (992,802) |  | (422,170) | (333,232) |  |
Operating income | (3,918,800) |  | (111,906) | 592,587 |  |
Interest income | (36,295,212) |  | (39,338,076) | (33,897,656) |  |
Interest expense | (34,302,793) |  | (37,558,496) | (33,033,597) |  |
Income tax | (1,624) |  | (4,600) |  |  |
Net profit (loss) attributable to equity holders of the parent | (2,006,979) |  | (2,795,698) | (5,594,432) |  |
Assets by segment | (851,985,719) |  | (915,308,134) | (981,214,013) |  |
Plant, property and equipment, net | (138,297) |  |  |  |  |
Investment in associated companies | (3,847,209) |  | 1,830,488 | (7,393,181) |  |
Liabilities by segments | $ (441,820,311) |  | $ (484,575,112) | $ (485,698,799) |  |

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