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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, 2020
MXN ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance $ 639,343,370   $ 640,000,720 $ 676,343,198
Additions 198,788,458   238,821,559 240,263,874
Retirements (106,489,087)   (112,234,066) (106,977,930)
Business combinations 1,053,921   10,919,581 143,016
Revaluation adjustments 107,152,628      
Effect of translation of foreign subsidiaries (1,598,974)   (23,371,038) (40,655,711)
Depreciation of the year (115,320,685)   (114,793,386) (129,115,727)
Ending balance 722,929,631 $ 36,239 639,343,370 640,000,720
Cost [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 1,319,587,687   1,285,672,457 1,303,278,914
Additions 198,788,458   238,821,559 240,263,874
Retirements (143,373,691)   (138,455,063) (140,581,001)
Business combinations 1,053,921   10,919,581 143,016
Revaluation adjustments 107,152,628      
Transfers (62,050,212)      
Effect of translation of foreign subsidiaries (65,357,954)   (77,370,847) (117,432,346)
Ending balance 1,355,800,837   1,319,587,687 1,285,672,457
Cost [member] | Network in operation in operation and equipment [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 990,673,603   969,195,936 989,665,946
Additions 90,387,449   82,992,062 68,900,443
Retirements (19,574,391)   (13,417,360) (1,610,246)
Business combinations 996,974   9,572,805 128,246
Revaluation adjustments 107,152,628      
Transfers (62,050,212)      
Effect of translation of foreign subsidiaries (49,993,808)   (57,669,840) (87,888,453)
Ending balance 1,057,592,243   990,673,603 969,195,936
Cost [member] | Land and buildings [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 50,801,253   57,130,326 62,584,189
Additions 570,062   1,530,677 4,429,433
Retirements (2,853,037)   (4,025,222) (3,987,671)
Business combinations     115,935 8,874
Effect of translation of foreign subsidiaries 369,300   (3,950,463) (5,904,499)
Ending balance 48,887,578   50,801,253 57,130,326
Cost [member] | Other assets [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 162,340,564   149,809,137 150,315,807
Additions 17,474,218   26,881,611 25,268,252
Retirements (14,454,598)   (7,594,735) (13,377,798)
Business combinations 55,848   1,021,051 2,578
Effect of translation of foreign subsidiaries (8,393,187)   (7,776,500) (12,399,702)
Ending balance 157,022,845   162,340,564 149,809,137
Cost [member] | Construction in process and advances plant suppliers [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 81,539,174   81,092,529 74,121,374
Additions 59,635,316   82,640,305 92,285,397
Retirements (68,661,847)   (76,892,011) (76,978,798)
Business combinations 1,099   209,790 1,379
Effect of translation of foreign subsidiaries (5,011,829)   (5,511,439) (8,336,823)
Ending balance 67,501,913   81,539,174 81,092,529
Cost [member] | Spare parts for operation of the network [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 34,233,093   28,444,529 26,591,598
Additions 30,721,413   44,776,904 49,380,349
Retirements (37,829,818)   (36,525,735) (44,626,488)
Business combinations       1,939
Effect of translation of foreign subsidiaries (2,328,430)   (2,462,605) (2,902,869)
Ending balance 24,796,258   34,233,093 28,444,529
Accumulated depreciation [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 680,244,317   645,671,737 626,935,716
Retirements (36,884,604)   (26,220,997) (33,603,071)
Transfers (62,050,212)      
Effect of translation of foreign subsidiaries (63,758,980)   (53,999,809) (76,776,635)
Depreciation of the year 115,320,685   114,793,386 129,115,727
Ending balance 632,871,206   680,244,317 645,671,737
Accumulated depreciation [member] | Network in operation in operation and equipment [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 580,370,101   560,005,547 552,345,509
Retirements (25,726,856)   (24,954,514) (28,712,096)
Transfers (62,050,212)      
Effect of translation of foreign subsidiaries (58,055,450)   (47,778,627) (67,907,227)
Depreciation of the year 96,729,723   93,097,695 104,279,361
Ending balance 531,267,306   580,370,101 560,005,547
Accumulated depreciation [member] | Other assets [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 90,332,191   76,533,494 63,359,529
Retirements (9,317,821)   (695,425) (2,418,837)
Effect of translation of foreign subsidiaries (5,120,175)   (4,754,982) (6,579,983)
Depreciation of the year 16,549,822   19,249,104 22,172,785
Ending balance 92,444,017   90,332,191 76,533,494
Accumulated depreciation [member] | Spare parts for operation of the network [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 74,717   321,747 575,393
Retirements (176,131)   (283,986) (160,696)
Effect of translation of foreign subsidiaries 38,898   (79,226) (131,429)
Depreciation of the year 135,000   116,182 38,479
Ending balance 72,484   74,717 321,747
Accumulated depreciation [member] | Buildings [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 9,467,308   8,810,949 10,655,285
Retirements (1,663,796)   (287,072) (2,311,442)
Effect of translation of foreign subsidiaries (622,253)   (1,386,974) (2,157,996)
Depreciation of the year 1,906,140   2,330,405 2,625,102
Ending balance $ 9,087,399   $ 9,467,308 $ 8,810,949