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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, 2018 MXN ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($)
Disclosure of information about consolidated structured entities [line items] |  |  |  |
Total revenues | $ 1,038,207,681 | $ 52,747 | $ 1,021,633,535 | $ 975,412,488
Total cost and operating expenses | 898,650,510 | 45,657 | 921,490,232 | 865,802,178
Operating income | 139,557,171 | 7,090 | 100,143,303 | 109,610,310
Interest (expense) income, net | (21,125,264) |  | (27,375,133) | (29,669,417)
Foreign currency exchange (loss) gain, net | (7,261,956) |  | (13,818,951) | (40,427,407)
Other financing cost, net | (10,176,316) |  | (1,943,760) | (16,225,841)
Income tax | 46,477,079 | 2,361 | 24,941,511 | 11,398,856
Equity interest in net income of associated companies | 267 |  | 91,385 | 189,950
Net profit (loss) | 54,516,823 |  | 32,155,333 | 12,078,739
Distribution of the net profit (loss) to: |  |  |  |
Equity owners of holding company | 52,566,197 | 2,670 | 29,325,921 | 8,649,427
Non-controlling interest | 1,950,626 | 100 | 2,829,412 | 3,429,312
Net profit (loss) | 54,516,823 |  | 32,155,333 | 12,078,739
Net other comprehensive income (loss) to be reclassified to profit or loss in subsequent years: |  |  |  |
Effect of translation of foreign entities | (64,314,032) | (3,268) | (18,309,877) | 107,498,708
Effect of fair value of derivatives, net of deferred taxes |  |  | 12,292 | 49,129
Items not to be reclassified to profit or loss in subsequent years: |  |  |  |
Remeasurement of defined benefit plan, net of income tax effect | 757,278 | 38 | (7,046,089) | 14,773,399
Equity investments at fair value | (3,765,688) | (191) | 622,424 | (6,673,731)
Total other comprehensive income (loss) items for the year, net of deferred taxes | (67,322,442) | (3,421) | (24,721,250) | 115,647,505
Total comprehensive income (loss) for the year | (12,805,619) | (651) | 7,434,083 | 127,726,244
Comprehensive income for the period attributable to: |  |  |  |
Equity holders of the parent | (11,770,227) | (598) | 1,201,698 | 120,974,842
Non-controlling interests | (1,035,392) | (53) | 6,232,385 | 6,751,402
Total comprehensive income (loss) for the year | (12,805,619) | $ (651) | 7,434,083 | 127,726,244
Parent [member] |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |
Total revenues | 170,887,145 |  | 160,057,511 | 137,236,301
Total cost and operating expenses | 129,039,749 |  | 123,548,341 | 117,835,634
Operating income | 41,847,396 |  | 36,509,170 | 19,400,667
Interest (expense) income, net | (24,831,538) |  | (16,779,235) | (12,331,095)
Foreign currency exchange (loss) gain, net | 11,805,283 |  | (15,223,111) | (46,625,392)
Other financing cost, net | (4,443,892) |  | 6,775,455 | (10,475,673)
Income tax | 17,754,010 |  | 14,201,399 | (7,712,179)
Equity interest in net income of associated companies | 46,101,188 |  | 32,245,041 | 50,968,741
Net profit (loss) | 52,724,427 |  | 29,325,921 | 8,649,427
Distribution of the net profit (loss) to: |  |  |  |
Equity owners of holding company | 52,724,427 |  | 29,325,921 | 8,649,427
Net profit (loss) | 52,724,427 |  | 29,325,921 | 8,649,427
Net other comprehensive income (loss) to be reclassified to profit or loss in subsequent years: |  |  |  |
Effect of translation of foreign entities | (61,223,458) |  | (21,683,333) | 104,178,880
Effect of fair value of derivatives, net of deferred taxes |  |  | 12,292 | 48,496
Items not to be reclassified to profit or loss in subsequent years: |  |  |  |
Remeasurement of defined benefit plan, net of income tax effect | 652,722 |  | (7,075,606) | 14,771,770
Equity investments at fair value | (3,765,688) |  | 622,424 | (6,673,731)
Total other comprehensive income (loss) items for the year, net of deferred taxes | (64,336,424) |  | (28,124,223) | 112,325,415
Total comprehensive income (loss) for the year | (11,611,997) |  | 1,201,698 | 120,974,842
Comprehensive income for the period attributable to: |  |  |  |
Equity holders of the parent | (11,611,997) |  | 1,201,698 | 120,974,842
Total comprehensive income (loss) for the year | (11,611,997) |  | 1,201,698 | 120,974,842
Wholly-owned guarantor subsidiary [member] |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |
Total revenues | 190,924,413 |  | 170,991,493 | 173,714,225
Total cost and operating expenses | 183,542,058 |  | 163,152,868 | 160,949,691
Operating income | 7,382,355 |  | 7,838,625 | 12,764,534
Interest (expense) income, net | (11,033,069) |  | (12,365,116) | 97,314
Foreign currency exchange (loss) gain, net | 626,304 |  | 1,320,667 | (5,853,669)
Other financing cost, net |  |  |  | (11,203,533)
Income tax | 798,639 |  | 1,386,519 | 1,139,631
Equity interest in net income of associated companies | 1,325,723 |  | (8,977,146) | (1,342,073)
Net profit (loss) | (2,497,326) |  | (13,569,489) | (6,677,058)
Distribution of the net profit (loss) to: |  |  |  |
Equity owners of holding company | (2,497,326) |  | (13,569,489) | (6,677,058)
Net profit (loss) | (2,497,326) |  | (13,569,489) | (6,677,058)
Net other comprehensive income (loss) to be reclassified to profit or loss in subsequent years: |  |  |  |
Effect of translation of foreign entities | (724,521) |  | (1,897,936) | 755,978
Items not to be reclassified to profit or loss in subsequent years: |  |  |  |
Remeasurement of defined benefit plan, net of income tax effect | (1,603,145) |  | (8,439) | (12,300)
Total other comprehensive income (loss) items for the year, net of deferred taxes | (2,327,666) |  | (1,906,375) | 743,678
Total comprehensive income (loss) for the year | (4,824,992) |  | (15,475,864) | (5,933,380)
Comprehensive income for the period attributable to: |  |  |  |
Equity holders of the parent | (4,824,992) |  | (15,475,864) | (5,933,380)
Total comprehensive income (loss) for the year | (4,824,992) |  | (15,475,864) | (5,933,380)
Combined non-guarantor subsidiaries [member] |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |
Total revenues | 890,427,121 |  | 887,951,615 | 857,137,822
Total cost and operating expenses | 799,085,884 |  | 832,429,198 | 778,483,079
Operating income | 91,341,237 |  | 55,522,417 | 78,654,743
Interest (expense) income, net | 14,757,906 |  | 1,810,523 | (17,207,855)
Foreign currency exchange (loss) gain, net | (19,693,543) |  | 83,493 | 12,051,654
Other financing cost, net | (5,732,424) |  | (8,719,215) | 5,453,365
Income tax | 27,924,430 |  | 9,353,593 | 17,971,404
Equity interest in net income of associated companies | (2,497,059) |  | (13,466,845) | (6,677,059)
Net profit (loss) | 50,251,687 |  | 25,876,780 | 54,303,444
Distribution of the net profit (loss) to: |  |  |  |
Equity owners of holding company | 46,641,696 |  | 21,417,549 | 50,049,280
Non-controlling interest | 3,609,991 |  | 4,459,231 | 4,254,164
Net profit (loss) | 50,251,687 |  | 25,876,780 | 54,303,444
Net other comprehensive income (loss) to be reclassified to profit or loss in subsequent years: |  |  |  |
Effect of translation of foreign entities | (64,314,032) |  | (18,309,877) | 108,291,984
Effect of fair value of derivatives, net of deferred taxes |  |  | 12,292 | 30,206
Items not to be reclassified to profit or loss in subsequent years: |  |  |  |
Remeasurement of defined benefit plan, net of income tax effect | 757,278 |  | (7,046,089) | 7,477,926
Equity investments at fair value | (3,765,688) |  | 622,424 | (6,673,731)
Total other comprehensive income (loss) items for the year, net of deferred taxes | (67,322,442) |  | (24,721,250) | 109,126,385
Total comprehensive income (loss) for the year | (17,070,755) |  | 1,155,530 | 163,429,829
Comprehensive income for the period attributable to: |  |  |  |
Equity holders of the parent | (16,035,363) |  | (5,076,855) | 150,900,984
Non-controlling interests | (1,035,392) |  | 6,232,385 | 12,528,845
Total comprehensive income (loss) for the year | (17,070,755) |  | 1,155,530 | 163,429,829
Eliminations [member] |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |
Total revenues | (214,030,998) |  | (197,367,084) | (192,675,860)
Total cost and operating expenses | (213,017,181) |  | (197,640,175) | (191,466,226)
Operating income | (1,013,817) |  | 273,091 | (1,209,634)
Interest (expense) income, net | (18,563) |  | (41,305) | (227,781)
Equity interest in net income of associated companies | (44,929,585) |  | (9,709,665) | (42,759,659)
Net profit (loss) | (45,961,965) |  | (9,477,879) | (44,197,074)
Distribution of the net profit (loss) to: |  |  |  |
Equity owners of holding company | (44,302,600) |  | (7,848,060) | (43,372,222)
Non-controlling interest | (1,659,365) |  | (1,629,819) | (824,852)
Net profit (loss) | (45,961,965) |  | (9,477,879) | (44,197,074)
Net other comprehensive income (loss) to be reclassified to profit or loss in subsequent years: |  |  |  |
Effect of translation of foreign entities | 61,947,979 |  | 23,581,269 | (105,728,134)
Effect of fair value of derivatives, net of deferred taxes |  |  | (12,292) | (29,573)
Items not to be reclassified to profit or loss in subsequent years: |  |  |  |
Remeasurement of defined benefit plan, net of income tax effect | 950,423 |  | 7,084,045 | (7,463,997)
Equity investments at fair value | 3,765,688 |  | (622,424) | 6,673,731
Total other comprehensive income (loss) items for the year, net of deferred taxes | 66,664,090 |  | 30,030,598 | (106,547,973)
Total comprehensive income (loss) for the year | 20,702,125 |  | 20,552,719 | (150,745,047)
Comprehensive income for the period attributable to: |  |  |  |
Equity holders of the parent | 20,702,125 |  | 20,552,719 | (144,967,604)
Non-controlling interests |  |  |  | (5,777,443)
Total comprehensive income (loss) for the year | $ 20,702,125 |  | $ 20,552,719 | $ (150,745,047)

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