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v3.19.1

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, 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)

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