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Segments - Summary of Operating Segments (Detail)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2014
MXN ($)
Disclosure of Operating Segments [Line Items]            
External revenues $ 1,021,633,535   $ 975,412,488 $ 893,737,739    
Total revenues 1,021,633,535 $ 51,632 975,412,488 893,737,739    
Depreciation and amortization 160,174,942 8,095 148,525,921 125,714,735    
Operating income 100,143,303   109,610,310 141,413,161    
Interest income 2,925,648 148 4,192,595 4,853,012    
Interest expense 30,300,781 1,531 33,862,012 31,197,372    
Expenses (income) tax 24,941,511 1,261 11,398,856 19,179,651    
Equity interest in net (loss) income of associated companies 91,385   189,950 (1,426,696)    
Net profit (loss) attributable to equity holders of the parent 29,325,921 $ 1,482 8,649,427 35,054,772    
Assets by segment 1,486,211,852   1,515,042,274 1,296,486,813 $ 75,112  
Plant, property and equipment, net 676,343,198   701,190,066 573,528,878 34,182 $ 588,106,180
Goodwill 151,463,232   152,632,635 137,113,716 7,655  
Trademarks, net 9,937,807   12,566,893 11,300,306    
Licenses and rights, net 113,304,386   116,031,264 90,449,251    
Investment in associated companies 3,735,172   3,603,484 3,110,570 189  
Liabilities by segments 1,225,578,335   1,244,018,507 1,135,632,627 $ 61,941  
Europe [member]            
Disclosure of Operating Segments [Line Items]            
Goodwill       711,723    
Operating segments [member] | Mexico [member]            
Disclosure of Operating Segments [Line Items]            
External revenues 190,022,612   187,127,903 191,750,997    
Intersegment revenues 16,748,428   16,438,858 13,073,782    
Total revenues 206,771,040   203,566,761 204,824,779    
Depreciation and amortization 17,030,251   16,451,496 14,261,516    
Operating income 50,666,028   48,219,505 70,726,013    
Interest income 30,083,437   28,659,372 19,094,408    
Interest expense 32,185,868   32,004,944 27,023,466    
Expenses (income) tax 18,142,482   2,502,242 7,976,111    
Equity interest in net (loss) income of associated companies 99,044   67,472 (1,512,226)    
Net profit (loss) attributable to equity holders of the parent 26,321,442   378,150 28,660,395    
Assets by segment 1,033,036,406   1,070,598,204 955,534,316    
Plant, property and equipment, net 59,137,555   64,893,242 57,048,006    
Goodwill 27,102,384   27,186,328 27,067,441    
Trademarks, net 406,723   615,318 826,446    
Licenses and rights, net 11,457,720   5,887,092 4,395,698    
Investment in associated companies 469,662   7,605,220 10,818,612    
Liabilities by segments 794,598,013   798,044,609 723,559,636    
Operating segments [member] | Telmex [member]            
Disclosure of Operating Segments [Line Items]            
External revenues 89,731,238   93,343,612 93,657,944    
Intersegment revenues 8,753,525   8,872,248 7,420,418    
Total revenues 98,484,763   102,215,860 101,078,362    
Depreciation and amortization 18,902,238   17,150,013 15,416,456    
Operating income 7,921,524   12,275,892 15,947,164    
Interest income 619,748   303,915 272,284    
Interest expense 1,028,593   1,135,552 1,413,686    
Expenses (income) tax 387,145   921,803 2,896,465    
Equity interest in net (loss) income of associated companies 16,564   116,368 65,033    
Net profit (loss) attributable to equity holders of the parent 184,387   902,282 5,852,674    
Assets by segment 170,402,561   161,133,722 163,955,665    
Plant, property and equipment, net 109,713,770   112,220,236 105,177,653    
Goodwill 213,926   213,926 392,523    
Trademarks, net 274,786   307,881 346,566    
Licenses and rights, net 13,175   42,867 72,557    
Investment in associated companies 546,872   2,218,824 1,955,186    
Liabilities by segments 133,428,178   117,663,161 139,362,960    
Operating segments [member] | Brazil [member]            
Disclosure of Operating Segments [Line Items]            
External revenues 210,536,673   193,796,237 174,722,286    
Intersegment revenues 4,785,601   3,560,388 3,451,846    
Total revenues 215,322,274   197,356,625 178,174,132    
Depreciation and amortization 51,486,652   47,170,935 38,219,152    
Operating income 11,601,369   6,325,323 10,878,548    
Interest income 3,792,242   3,747,684 1,616,356    
Interest expense 23,578,083   22,970,335 16,450,388    
Expenses (income) tax (2,991,377)   (4,294,040) (4,846,932)    
Equity interest in net (loss) income of associated companies (232)   (270) (5,243)    
Net profit (loss) attributable to equity holders of the parent (6,617,381)   (10,357,493) (12,785,017)    
Assets by segment 428,281,963   461,831,754 311,838,555    
Plant, property and equipment, net 187,459,628   203,270,555 147,884,562    
Goodwill 24,708,739   26,106,622 17,931,543    
Trademarks, net 246,557   366,727 341,750    
Licenses and rights, net 35,662,305   41,496,209 28,442,759    
Investment in associated companies 640   699 700    
Liabilities by segments 322,620,030   349,915,118 221,907,486    
Operating segments [member] | Southern Cone [member]            
Disclosure of Operating Segments [Line Items]            
External revenues 81,092,885   71,553,356 68,520,541    
Intersegment revenues 1,250,983   776,719 427,609    
Total revenues 82,343,868   72,330,075 68,948,150    
Depreciation and amortization 10,639,591   9,739,634 8,608,518    
Operating income 11,676,427   8,317,053 9,185,471    
Interest income 2,884,613   2,649,539 3,505,616    
Interest expense 4,637,989   5,049,457 2,599,901    
Expenses (income) tax 3,535,302   2,021,090 2,621,598    
Equity interest in net (loss) income of associated companies (9,801)   (23,319) 21,856    
Net profit (loss) attributable to equity holders of the parent 4,421,938   3,765,015 (6,806,573)    
Assets by segment 133,136,177   140,617,162 118,217,618    
Plant, property and equipment, net 69,006,093   67,023,143 52,735,563    
Goodwill 3,073,444   3,006,448 2,672,724    
Licenses and rights, net 8,885,086   8,760,860 8,318,161    
Investment in associated companies 63,110   81,284 115,452    
Liabilities by segments 119,123,646   124,149,687 101,601,641    
Operating segments [member] | Columbia [member]            
Disclosure of Operating Segments [Line Items]            
External revenues 72,435,460   67,330,768 65,871,301    
Intersegment revenues 304,555   257,767 265,474    
Total revenues 72,740,015   67,588,535 66,136,775    
Depreciation and amortization 12,373,790   11,283,749 9,279,871    
Operating income (4,704,165)   11,209,959 13,361,859    
Interest income 211,521   104,304 366,533    
Interest expense 1,955,688   1,079,989 577,440    
Expenses (income) tax (1,874,594)   4,456,750 3,997,944    
Net profit (loss) attributable to equity holders of the parent (6,209,530)   4,022,633 3,468,029    
Assets by segment 108,362,023   103,361,235 81,170,568    
Plant, property and equipment, net 57,060,931   59,690,886 44,811,656    
Goodwill 13,981,033   14,659,891 11,612,051    
Trademarks, net     194 522    
Licenses and rights, net 4,197,498   4,603,793 3,661,838    
Investment in associated companies 451   470 371    
Liabilities by segments 54,756,152   40,811,337 31,254,646    
Operating segments [member] | Andean [member]            
Disclosure of Operating Segments [Line Items]            
External revenues 56,393,595   55,825,972 51,738,731    
Intersegment revenues 177,856   304,834 220,094    
Total revenues 56,571,451   56,130,806 51,958,825    
Depreciation and amortization 8,328,705   7,764,474 6,368,233    
Operating income 5,650,477   6,086,638 7,853,311    
Interest income 1,793,974   944,945 743,028    
Interest expense 1,573,929   1,147,380 713,895    
Expenses (income) tax 1,806,085   1,768,066 2,944,548    
Net profit (loss) attributable to equity holders of the parent 1,595,382   3,621,863 3,766,425    
Assets by segment 113,478,626   113,839,981 87,619,264    
Plant, property and equipment, net 35,930,966   37,716,772 30,254,858    
Goodwill 6,113,495   5,948,335 4,396,090    
Licenses and rights, net 11,295,202   12,882,210 6,256,297    
Liabilities by segments 48,656,628   52,949,608 33,048,503    
Operating segments [member] | Central America [member]            
Disclosure of Operating Segments [Line Items]            
External revenues 44,094,835   42,131,666 34,515,781    
Intersegment revenues 187,086   289,465 235,779    
Total revenues 44,281,921   42,421,131 34,751,560    
Depreciation and amortization 9,668,439   10,474,681 9,699,082    
Operating income 5,252,401   3,830,974 1,750,027    
Interest income 1,064,992   462,779 227,590    
Interest expense 485,684   411,597 349,449    
Expenses (income) tax 2,025,618   3,291,776 2,257,695    
Equity interest in net (loss) income of associated companies     171      
Net profit (loss) attributable to equity holders of the parent 3,713,301   538,890 (680,599)    
Assets by segment 81,529,691   80,832,029 68,425,540    
Plant, property and equipment, net 39,050,481   41,808,573 37,930,783    
Goodwill 5,597,990   5,652,268 5,213,703    
Licenses and rights, net 3,376,106   3,993,120 3,660,240    
Investment in associated companies 16,999   17,390 16,259    
Liabilities by segments 35,501,900   38,095,161 33,514,380    
Operating segments [member] | U.S.A [member]            
Disclosure of Operating Segments [Line Items]            
External revenues 148,589,487   140,856,365 110,653,812    
Intersegment revenues 44          
Total revenues 148,589,531   140,856,365 110,653,812    
Depreciation and amortization 1,594,727   1,073,623 741,038    
Operating income 2,915,123   1,220,601 1,293,706    
Interest income 394,196   239,797 232,856    
Expenses (income) tax 1,803,555   767,295 605,809    
Net profit (loss) attributable to equity holders of the parent 1,793,875   987,790 1,142,975    
Assets by segment 40,761,830   42,812,349 36,072,729    
Plant, property and equipment, net 1,693,642   1,949,166 1,783,612    
Goodwill 3,341,956   3,464,217 1,903,762    
Trademarks, net 631,024   788,228 686,052    
Liabilities by segments 38,249,957   41,369,767 31,170,822    
Operating segments [member] | Caribbean [member]            
Disclosure of Operating Segments [Line Items]            
External revenues 35,092,578   36,467,781 29,625,274    
Intersegment revenues 122,656   30,210 32,699    
Total revenues 35,215,234   36,497,991 29,657,973    
Depreciation and amortization 5,349,757   5,225,498 5,315,349    
Operating income 4,752,168   6,143,183 3,891,263    
Interest income 1,111,980   691,132 396,314    
Interest expense 377,727   143,322 48,751    
Expenses (income) tax 3,529,253   2,542,080 1,483,187    
Net profit (loss) attributable to equity holders of the parent 1,262,073   3,318,960 2,073,287    
Assets by segment 88,672,466   93,941,695 76,084,634    
Plant, property and equipment, net 32,173,524   33,854,428 29,063,549    
Goodwill 14,186,723   14,186,723 14,186,723    
Trademarks, net 262,641   284,665 242,175    
Licenses and rights, net 7,276,039   7,694,798 6,443,439    
Liabilities by segments 43,978,410   44,790,656 31,727,281    
Operating segments [member] | Europe [member]            
Disclosure of Operating Segments [Line Items]            
External revenues 93,644,172   86,978,828 72,681,072    
Total revenues 93,644,172   86,978,828 72,681,072    
Depreciation and amortization 25,222,962   22,525,050 17,938,198    
Operating income 4,523,857   5,388,595 6,205,426    
Interest income 307,021   286,784 474,826    
Interest expense 2,035,716   2,953,033 2,861,655    
Expenses (income) tax (1,417,358)   (2,578,206) (756,774)    
Equity interest in net (loss) income of associated companies (14,190)   29,528 3,884    
Net profit (loss) attributable to equity holders of the parent 5,656,132   7,065,769 6,157,757    
Assets by segment 203,858,243   227,288,156 182,087,483    
Plant, property and equipment, net 85,116,608   78,763,065 66,838,636    
Goodwill 53,143,542   52,207,877 51,737,156    
Trademarks, net 8,116,076   10,203,880 8,856,795    
Licenses and rights, net 31,141,255   30,670,315 29,198,262    
Investment in associated companies 806,950   1,072,778 908,995    
Liabilities by segments 119,240,533   121,928,202 121,586,194    
Eliminations [member]            
Disclosure of Operating Segments [Line Items]            
Intersegment revenues (32,330,734)   (30,530,489) (25,127,701)    
Total revenues (32,330,734)   (30,530,489) (25,127,701)    
Depreciation and amortization (422,170)   (333,232) (132,678)    
Operating income (111,906)   592,587 320,373    
Interest income (39,338,076)   (33,897,656) (22,076,799)    
Interest expense (37,558,496)   (33,033,597) (20,841,259)    
Expenses (income) tax (4,600)          
Net profit (loss) attributable to equity holders of the parent (2,795,698)   (5,594,432) 4,205,419    
Assets by segment (915,308,134)   (981,214,013) (784,519,559)    
Investment in associated companies 1,830,488   (7,393,181) (10,705,005)    
Liabilities by segments $ (484,575,112)   $ (485,698,799) $ (333,100,922)