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Property, Plant and Equipment, Net - Schedule of Property, Plant and Equipment, Net (Detail)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance $ 701,190,066   $ 573,528,878 $ 588,106,180
Additions 193,815,932   233,591,696 226,227,083
Retirements (72,079,914)   (92,981,332) (104,791,205)
Business combinations 746,007   1,963,996 5,329,213
Spin-off effects       (5,588,120)
Effect of translation of foreign subsidiaries (12,122,813)   112,749,172 (25,598,870)
Depreciation of the year (135,206,080)   (127,662,344) (110,155,403)
Ending balance 676,343,198 $ 34,182 701,190,066 573,528,878
Cost [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 1,256,341,372   861,840,855 864,587,479
Additions 193,815,932   233,591,696 226,227,083
Retirements (99,444,894)   (121,078,982) (141,301,400)
Business combinations 746,007   1,963,996 5,329,213
Spin-off effects       (12,991,776)
Effect of translation of foreign subsidiaries (48,179,503)   280,023,807 (80,009,744)
Ending balance 1,303,278,914   1,256,341,372 861,840,855
Cost [member] | Network in operation in operation and equipment [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 971,276,013   641,384,702 642,617,237
Additions 78,272,882   101,794,197 78,632,899
Retirements (21,657,715)   (8,963,076) (16,061,956)
Business combinations 599,306   1,873,445 4,293,671
Effect of translation of foreign subsidiaries (38,824,540)   235,186,745 (68,097,149)
Ending balance 989,665,946   971,276,013 641,384,702
Cost [member] | Land and buildings [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 62,135,411   54,794,386 56,463,536
Additions 2,858,996   2,900,511 2,559,088
Retirements (415,219)   (2,845,298) (2,492,288)
Business combinations 27,686   3,839 54,902
Effect of translation of foreign subsidiaries (2,022,685)   7,281,973 (1,790,852)
Ending balance 62,584,189   62,135,411 54,794,386
Cost [member] | Other assets [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 144,927,016   106,468,602 105,550,807
Additions 19,287,525   24,368,918 27,711,493
Retirements (8,112,571)   (10,717,096) (10,169,829)
Business combinations 80,734   69,937 820,329
Spin-off effects       (12,643,381)
Effect of translation of foreign subsidiaries (5,866,897)   24,736,655 (4,800,817)
Ending balance 150,315,807   144,927,016 106,468,602
Cost [member] | Construction in process and advances plant suppliers [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 49,719,884   38,850,776 39,107,185
Additions 66,383,381   70,517,319 72,899,705
Retirements (41,279,573)   (70,911,593) (68,666,020)
Business combinations 34,705   11,255 160,311
Spin-off effects       (348,395)
Effect of translation of foreign subsidiaries (737,023)   11,252,127 (4,302,010)
Ending balance 74,121,374   49,719,884 38,850,776
Cost [member] | Inventories for operation of network [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 28,283,048   20,342,389 20,848,714
Additions 27,013,148   34,010,751 44,423,898
Retirements (27,979,816)   (27,641,919) (43,911,307)
Business combinations 3,576   5,520  
Effect of translation of foreign subsidiaries (728,358)   1,566,307 (1,018,916)
Ending balance 26,591,598   28,283,048 20,342,389
Accumulated depreciation [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 555,151,306   288,311,977 276,481,299
Retirements (27,364,980)   (28,097,650) (36,510,195)
Spin-off effects       (7,403,656)
Effect of translation of foreign subsidiaries (36,056,690)   167,274,635 (54,410,874)
Depreciation of the year 135,206,080   127,662,344 110,155,403
Ending balance 626,935,716   555,151,306 288,311,977
Accumulated depreciation [member] | Network in operation in operation and equipment [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 495,887,086   236,731,728 234,527,131
Retirements (21,214,724)   (1,968,376) (31,529,529)
Spin-off effects       (7,403,656)
Effect of translation of foreign subsidiaries (32,860,339)   153,147,349 (51,082,202)
Depreciation of the year 110,533,486   107,976,385 92,219,984
Ending balance 552,345,509   495,887,086 236,731,728
Accumulated depreciation [member] | Other assets [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 48,459,697   47,057,084 38,276,028
Retirements (4,572,509)   (25,099,710) (4,533,893)
Effect of translation of foreign subsidiaries (2,251,958)   10,396,438 (1,995,119)
Depreciation of the year 21,724,299   16,105,885 15,310,068
Ending balance 63,359,529   48,459,697 47,057,084
Accumulated depreciation [member] | Inventories for operation of network [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 323,201   (44,423) (50,265)
Retirements (9,205)   (54,280) (13,405)
Effect of translation of foreign subsidiaries (4,339)   20,896 1,409
Depreciation of the year 265,736   401,008 17,838
Ending balance 575,393   323,201 (44,423)
Accumulated depreciation [member] | Buildings [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 10,481,322   4,567,588 3,728,405
Retirements (1,568,542)   (975,284) (433,368)
Effect of translation of foreign subsidiaries (940,054)   3,709,952 (1,334,962)
Depreciation of the year 2,682,559   3,179,066 2,607,513
Ending balance $ 10,655,285   $ 10,481,322 $ 4,567,588