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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)