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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, 2018
MXN ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance $ 676,343,198   $ 701,190,066 $ 573,528,878
Additions 240,263,874   193,815,932 233,591,696
Retirements (106,977,930)   (72,079,914) (92,981,332)
Business combinations 143,016   746,007 1,963,996
Effect of translation of foreign subsidiaries (40,655,711)   (12,122,813) 112,749,172
Depreciation of the year (129,115,727)   (135,206,080) (127,662,344)
Ending balance 640,000,720 $ 32,516 676,343,198 701,190,066
Cost [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 1,303,278,914   1,256,341,372 861,840,855
Additions 240,263,874   193,815,932 233,591,696
Retirements (140,581,001)   (99,444,894) (121,078,982)
Business combinations 143,016   746,007 1,963,996
Effect of translation of foreign subsidiaries (117,432,346)   (48,179,503) 280,023,807
Ending balance 1,285,672,457   1,303,278,914 1,256,341,372
Cost [member] | Network in operation in operation and equipment [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 989,665,946   971,276,013 641,384,702
Additions 68,900,443   78,272,882 101,794,197
Retirements (1,610,246)   (21,657,715) (8,963,076)
Business combinations 128,246   599,306 1,873,445
Effect of translation of foreign subsidiaries (87,888,453)   (38,824,540) 235,186,745
Ending balance 969,195,936   989,665,946 971,276,013
Cost [member] | Land and buildings [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 62,584,189   62,135,411 54,794,386
Additions 4,429,433   2,858,996 2,900,511
Retirements (3,987,671)   (415,219) (2,845,298)
Business combinations 8,874   27,686 3,839
Effect of translation of foreign subsidiaries (5,904,499)   (2,022,685) 7,281,973
Ending balance 57,130,326   62,584,189 62,135,411
Cost [member] | Other assets [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 150,315,807   144,927,016 106,468,602
Additions 25,268,252   19,287,525 24,368,918
Retirements (13,377,798)   (8,112,571) (10,717,096)
Business combinations 2,578   80,734 69,937
Effect of translation of foreign subsidiaries (12,399,702)   (5,866,897) 24,736,655
Ending balance 149,809,137   150,315,807 144,927,016
Cost [member] | Construction in process and advances plant suppliers [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 74,121,374   49,719,884 38,850,776
Additions 92,285,397   66,383,381 70,517,319
Retirements (76,978,798)   (41,279,573) (70,911,593)
Business combinations 1,379   34,705 11,255
Effect of translation of foreign subsidiaries (8,336,823)   (737,023) 11,252,127
Ending balance 81,092,529   74,121,374 49,719,884
Cost [member] | Spare parts for operation of the network [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 26,591,598   28,283,048 20,342,389
Additions 49,380,349   27,013,148 34,010,751
Retirements (44,626,488)   (27,979,816) (27,641,919)
Business combinations 1,939   3,576 5,520
Effect of translation of foreign subsidiaries (2,902,869)   (728,358) 1,566,307
Ending balance 28,444,529   26,591,598 28,283,048
Accumulated depreciation [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance (626,935,716)   (555,151,306) (288,311,977)
Retirements 33,603,071   27,364,980 28,097,650
Effect of translation of foreign subsidiaries 76,776,635   36,056,690 (167,274,635)
Depreciation of the year (129,115,727)   (135,206,080) (127,662,344)
Ending balance (645,671,737)   (626,935,716) (555,151,306)
Accumulated depreciation [member] | Network in operation in operation and equipment [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance (552,345,509)   (495,887,086) (236,731,728)
Retirements 28,712,096   21,214,724 1,968,376
Effect of translation of foreign subsidiaries 67,907,227   32,860,339 (153,147,349)
Depreciation of the year (104,279,361)   (110,533,486) (107,976,385)
Ending balance (560,005,547)   (552,345,509) (495,887,086)
Accumulated depreciation [member] | Other assets [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance (63,359,529)   (48,459,697) (47,057,084)
Retirements 2,418,837   4,572,509 25,099,710
Effect of translation of foreign subsidiaries 6,579,983   2,251,958 (10,396,438)
Depreciation of the year (22,172,785)   (21,724,299) (16,105,885)
Ending balance (76,533,494)   (63,359,529) (48,459,697)
Accumulated depreciation [member] | Spare parts for operation of the network [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance (575,393)   (323,201) 44,423
Retirements 160,696   9,205 54,280
Effect of translation of foreign subsidiaries 131,429   4,339 (20,896)
Depreciation of the year (38,479)   (265,736) (401,008)
Ending balance (321,747)   (575,393) (323,201)
Accumulated depreciation [member] | Buildings [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance (10,655,285)   (10,481,322) (4,567,588)
Retirements 2,311,442   1,568,542 975,284
Effect of translation of foreign subsidiaries 2,157,996   940,054 (3,709,952)
Depreciation of the year (2,625,102)   (2,682,559) (3,179,066)
Ending balance $ (8,810,949)   $ (10,655,285) $ (10,481,322)