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v3.20.1

Property, Plant and Equipment, Net - Schedule of Property, Plant and Equipment, Net (Detail) $ in Thousands, $ in Millions | 12 Months Ended
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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

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