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v3.21.1

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, 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

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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_a&doctype=Standard -URIDate 2020-01-01 + Details
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