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Supplemental Guarantor Information - Condensed Consolidating Statements of Comprehensive Income (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 information about consolidated structured entities [line items] |  |  |  |
Total operating revenues | $ 1,007,347,869 | $ 53,454 | $ 1,038,207,681 | $ 1,021,633,535
Total operating cost and expenses | 852,507,334 | 45,237 | 898,650,510 | 921,490,232
Operating income | 154,840,535 | 8,217 | 139,557,171 | 100,143,303
Interest (expense) income, net | (31,626,667) |  | (21,125,264) | (27,375,133)
Foreign currency exchange (loss) gain, net | 5,226,071 |  | (7,261,956) | (13,818,951)
Valuation of derivatives, interest cost from labor obligations and other financial items, net | (7,075,342) |  | (10,176,316) | (1,943,760)
Income tax | 51,033,533 | 2,708 | 46,477,079 | 24,941,511
Equity interest in net income of associated companies | (17,609) | (1) | 267 | 91,385
Net profit (loss) for the year | 70,313,455 |  | 54,516,823 | 32,155,333
Net profit for the year attributable to: |  |  |  |
Equity holders of the parent | 67,730,891 | 3,594 | 52,566,197 | 29,325,921
Non-controlling interest | 2,582,564 | 137 | 1,950,626 | 2,829,412
Net other comprehensive income (loss) to be reclassified to profit or loss in subsequent years: |  |  |  |
Effect of translation of foreign entities | (35,536,252) | (1,886) | (64,314,032) | (18,309,877)
Effect of fair value of derivatives, net of deferred taxes |  |  |  | 12,292
Items not to be reclassified to profit or (loss) in subsequent years: |  |  |  |
Re-measurement of defined benefit plan, net of deferred taxes | (29,535,672) | (1,567) | 757,278 | (7,046,089)
Unrealized gain on equity investments at fair value, net of deferred taxes | 883,408 | 47 | (3,765,688) | 622,424
Total comprehensive income for the year | (64,188,516) | (3,406) | (67,322,442) | (24,721,250)
Comprehensive income for the year attributable to: |  |  |  |
Equity holders of the parent | 5,450,679 | 289 | (11,770,227) | 1,201,698
Non-controlling interests | 674,260 | 36 | (1,035,392) | 6,232,385
Total comprehensive income (loss) for the year | 6,124,939 | $ 325 | (12,805,619) | 7,434,083
Parent [member] |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |
Total operating revenues | 171,369,419 |  | 170,887,145 | 160,057,511
Total operating cost and expenses | 138,116,795 |  | 129,039,749 | 123,548,341
Operating income | 33,252,624 |  | 41,847,396 | 36,509,170
Interest (expense) income, net | (25,482,552) |  | (24,831,538) | (16,779,235)
Foreign currency exchange (loss) gain, net | 14,553,340 |  | 11,805,283 | (15,223,111)
Valuation of derivatives, interest cost from labor obligations and other financial items, net | 4,580,710 |  | (4,443,892) | 6,775,455
Income tax | 13,098,827 |  | 17,754,010 | 14,201,399
Equity interest in net income of associated companies | 53,925,595 |  | 46,101,188 | 32,245,041
Net profit (loss) for the year | 67,730,890 |  | 52,724,427 | 29,325,921
Net profit for the year attributable to: |  |  |  |
Equity holders of the parent | 67,730,890 |  | 52,724,427 | 29,325,921
Net other comprehensive income (loss) to be reclassified to profit or loss in subsequent years: |  |  |  |
Effect of translation of foreign entities | (34,010,066) |  | (61,223,458) | (21,683,333)
Effect of fair value of derivatives, net of deferred taxes |  |  |  | 12,292
Items not to be reclassified to profit or (loss) in subsequent years: |  |  |  |
Re-measurement of defined benefit plan, net of deferred taxes | (29,153,554) |  | 652,722 | (7,075,606)
Unrealized gain on equity investments at fair value, net of deferred taxes | 883,408 |  | (3,765,688) | 622,424
Total comprehensive income for the year | (62,280,212) |  | (64,336,424) | (28,124,223)
Comprehensive income for the year attributable to: |  |  |  |
Equity holders of the parent | 5,450,678 |  | (11,611,997) | 1,201,698
Total comprehensive income (loss) for the year | 5,450,678 |  | (11,611,997) | 1,201,698
Wholly-owned guarantor subsidiary [member] |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |
Total operating revenues | 205,719,219 |  | 190,924,413 | 170,991,493
Total operating cost and expenses | 188,910,056 |  | 183,542,058 | 163,152,868
Operating income | 16,809,163 |  | 7,382,355 | 7,838,625
Interest (expense) income, net | (16,714,198) |  | (11,033,069) | (12,365,116)
Foreign currency exchange (loss) gain, net | (43,999) |  | 626,304 | 1,320,667
Income tax | 1,082,274 |  | 798,639 | 1,386,519
Equity interest in net income of associated companies | 2,146,151 |  | 1,325,723 | (8,977,146)
Net profit (loss) for the year | 1,114,843 |  | (2,497,326) | (13,569,489)
Net profit for the year attributable to: |  |  |  |
Equity holders of the parent | 1,114,843 |  | (2,497,326) | (13,569,489)
Net other comprehensive income (loss) to be reclassified to profit or loss in subsequent years: |  |  |  |
Effect of translation of foreign entities | 1,639,022 |  | (724,521) | (1,897,936)
Items not to be reclassified to profit or (loss) in subsequent years: |  |  |  |
Re-measurement of defined benefit plan, net of deferred taxes | (2,654,252) |  | (1,603,145) | (8,439)
Total comprehensive income for the year | (1,015,230) |  | (2,327,666) | (1,906,375)
Comprehensive income for the year attributable to: |  |  |  |
Equity holders of the parent | 99,613 |  | (4,824,992) | (15,475,864)
Total comprehensive income (loss) for the year | 99,613 |  | (4,824,992) | (15,475,864)
Combined non-guarantor subsidiaries [member] |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |
Total operating revenues | 867,599,640 |  | 890,427,121 | 887,951,615
Total operating cost and expenses | 755,812,050 |  | 799,085,884 | 832,429,198
Operating income | 111,787,590 |  | 91,341,237 | 55,522,417
Interest (expense) income, net | 10,362,884 |  | 14,757,906 | 1,810,523
Foreign currency exchange (loss) gain, net | (9,283,270) |  | (19,693,543) | 83,493
Valuation of derivatives, interest cost from labor obligations and other financial items, net | (11,656,052) |  | (5,732,424) | (8,719,215)
Income tax | 36,852,432 |  | 27,924,430 | 9,353,593
Equity interest in net income of associated companies | 1,097,234 |  | (2,497,059) | (13,466,845)
Net profit (loss) for the year | 65,455,954 |  | 50,251,687 | 25,876,780
Net profit for the year attributable to: |  |  |  |
Equity holders of the parent | 59,618,592 |  | 46,641,696 | 21,417,549
Non-controlling interest | 5,837,362 |  | 3,609,991 | 4,459,231
Net other comprehensive income (loss) to be reclassified to profit or loss in subsequent years: |  |  |  |
Effect of translation of foreign entities | (35,536,252) |  | (64,314,032) | (18,309,877)
Effect of fair value of derivatives, net of deferred taxes |  |  |  | 12,292
Items not to be reclassified to profit or (loss) in subsequent years: |  |  |  |
Re-measurement of defined benefit plan, net of deferred taxes | (29,535,672) |  | 757,278 | (7,046,089)
Unrealized gain on equity investments at fair value, net of deferred taxes | 883,408 |  | (3,765,688) | 622,424
Total comprehensive income for the year | (64,188,516) |  | (67,322,442) | (24,721,250)
Comprehensive income for the year attributable to: |  |  |  |
Equity holders of the parent | 593,178 |  | (16,035,363) | (5,076,855)
Non-controlling interests | 674,260 |  | (1,035,392) | 6,232,385
Total comprehensive income (loss) for the year | 1,267,438 |  | (17,070,755) | 1,155,530
Eliminations [member] |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |
Total operating revenues | (237,340,409) |  | (214,030,998) | (197,367,084)
Total operating cost and expenses | (230,331,567) |  | (213,017,181) | (197,640,175)
Operating income | (7,008,842) |  | (1,013,817) | 273,091
Interest (expense) income, net | 207,199 |  | (18,563) | (41,305)
Equity interest in net income of associated companies | (57,186,589) |  | (44,929,585) | (9,709,665)
Net profit (loss) for the year | (63,988,232) |  | (45,961,965) | (9,477,879)
Net profit for the year attributable to: |  |  |  |
Equity holders of the parent | (60,733,434) |  | (44,302,600) | (7,848,060)
Non-controlling interest | (3,254,798) |  | (1,659,365) | (1,629,819)
Net other comprehensive income (loss) to be reclassified to profit or loss in subsequent years: |  |  |  |
Effect of translation of foreign entities | 32,371,044 |  | 61,947,979 | 23,581,269
Effect of fair value of derivatives, net of deferred taxes |  |  |  | (12,292)
Items not to be reclassified to profit or (loss) in subsequent years: |  |  |  |
Re-measurement of defined benefit plan, net of deferred taxes | 31,807,806 |  | 950,423 | 7,084,045
Unrealized gain on equity investments at fair value, net of deferred taxes | (883,408) |  | 3,765,688 | (622,424)
Total comprehensive income for the year | 63,295,442 |  | 66,664,090 | 30,030,598
Comprehensive income for the year attributable to: |  |  |  |
Equity holders of the parent | (692,790) |  | 20,702,125 | 20,552,719
Total comprehensive income (loss) for the year | $ (692,790) |  | $ 20,702,125 | $ 20,552,719

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