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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)