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Supplemental Guarantor Information - Condensed Consolidating Statements of Comprehensive Income (Detail)
$ in Thousands, $ in Millions
 12 Months Ended
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