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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, 2019
MXN ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance $ 640,000,720   $ 676,343,198 $ 701,190,066
Additions 238,821,559   240,263,874 193,815,932
Retirements (112,234,066)   (106,977,930) (72,079,914)
Business combinations 10,919,581   143,016 746,007
Effect of translation of foreign subsidiaries (23,371,038)   (40,655,711) (12,122,813)
Depreciation of the year (114,793,386)   (129,115,727) (135,206,080)
Ending balance 639,343,370 $ 33,926 640,000,720 676,343,198
Cost [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 1,285,672,457   1,303,278,914 1,256,341,372
Additions 238,821,559   240,263,874 193,815,932
Retirements (138,455,063)   (140,581,001) (99,444,894)
Business combinations 10,919,581   143,016 746,007
Effect of translation of foreign subsidiaries (77,370,847)   (117,432,346) (48,179,503)
Ending balance 1,319,587,687   1,285,672,457 1,303,278,914
Cost [member] | Network in operation in operation and equipment [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 969,195,936   989,665,946 971,276,013
Additions 82,992,062   68,900,443 78,272,882
Retirements (13,417,360)   (1,610,246) (21,657,715)
Business combinations 9,572,805   128,246 599,306
Effect of translation of foreign subsidiaries (57,669,840)   (87,888,453) (38,824,540)
Ending balance 990,673,603   969,195,936 989,665,946
Cost [member] | Land and buildings [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 57,130,326   62,584,189 62,135,411
Additions 1,530,677   4,429,433 2,858,996
Retirements (4,025,222)   (3,987,671) (415,219)
Business combinations 115,935   8,874 27,686
Effect of translation of foreign subsidiaries (3,950,463)   (5,904,499) (2,022,685)
Ending balance 50,801,253   57,130,326 62,584,189
Cost [member] | Other assets [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 149,809,137   150,315,807 144,927,016
Additions 26,881,611   25,268,252 19,287,525
Retirements (7,594,735)   (13,377,798) (8,112,571)
Business combinations 1,021,051   2,578 80,734
Effect of translation of foreign subsidiaries (7,776,500)   (12,399,702) (5,866,897)
Ending balance 162,340,564   149,809,137 150,315,807
Cost [member] | Construction in process and advances plant suppliers [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 81,092,529   74,121,374 49,719,884
Additions 82,640,305   92,285,397 66,383,381
Retirements (76,892,011)   (76,978,798) (41,279,573)
Business combinations 209,790   1,379 34,705
Effect of translation of foreign subsidiaries (5,511,439)   (8,336,823) (737,023)
Ending balance 81,539,174   81,092,529 74,121,374
Cost [member] | Spare parts for operation of the network [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 28,444,529   26,591,598 28,283,048
Additions 44,776,904   49,380,349 27,013,148
Retirements (36,525,735)   (44,626,488) (27,979,816)
Business combinations     1,939 3,576
Effect of translation of foreign subsidiaries (2,462,605)   (2,902,869) (728,358)
Ending balance 34,233,093   28,444,529 26,591,598
Accumulated depreciation [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 645,671,737   626,935,716 555,151,306
Retirements (26,220,997)   (33,603,071) (27,364,980)
Effect of translation of foreign subsidiaries (53,999,809)   (76,776,635) (36,056,690)
Depreciation of the year 114,793,386   129,115,727 135,206,080
Ending balance 680,244,317   645,671,737 626,935,716
Accumulated depreciation [member] | Network in operation in operation and equipment [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 560,005,547   552,345,509 495,887,086
Retirements (24,954,514)   (28,712,096) (21,214,724)
Effect of translation of foreign subsidiaries (47,778,627)   (67,907,227) (32,860,339)
Depreciation of the year 93,097,695   104,279,361 110,533,486
Ending balance 580,370,101   560,005,547 552,345,509
Accumulated depreciation [member] | Other assets [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 76,533,494   63,359,529 48,459,697
Retirements (695,425)   (2,418,837) (4,572,509)
Effect of translation of foreign subsidiaries (4,754,982)   (6,579,983) (2,251,958)
Depreciation of the year 19,249,104   22,172,785 21,724,299
Ending balance 90,332,191   76,533,494 63,359,529
Accumulated depreciation [member] | Spare parts for operation of the network [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 321,747   575,393 323,201
Retirements (283,986)   (160,696) (9,205)
Effect of translation of foreign subsidiaries (79,226)   (131,429) (4,339)
Depreciation of the year 116,182   38,479 265,736
Ending balance 74,717   321,747 575,393
Accumulated depreciation [member] | Buildings [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 8,810,949   10,655,285 10,481,322
Retirements (287,072)   (2,311,442) (1,568,542)
Effect of translation of foreign subsidiaries (1,386,974)   (2,157,996) (940,054)
Depreciation of the year 2,330,405   2,625,102 2,682,559
Ending balance $ 9,467,308   $ 8,810,949 $ 10,655,285