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Business Combinations, Acquisitions and Non-controlling Interest - Summary of Consolidated Statements of Comprehensive Income (Detail)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2020
MXN ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Disclosure of detailed information about business combination [line items]        
Operating costs and expenses $ 851,531,619 $ 42,686 $ 852,507,334 $ 898,650,510
Operating income 165,354,911 8,289 154,840,535 139,557,171
Net income 51,026,957 2,559 70,313,455 54,516,823
Total comprehensive income 104,489,719 5,237 6,124,939 (12,805,619)
Distribution of the net profit (loss) to:        
Equity holders of the parent 46,852,605 2,349 67,730,891 52,566,197
Non-controllinginterest 4,174,352 210 2,582,564 1,950,626
Net income 51,026,957 2,559 70,313,455 54,516,823
Comprehensive income (loss) for the year attributable to:        
Equity holders of the parent 86,150,118 4,319 5,450,679 (11,770,227)
Non-controllinginterest 18,339,601 918 674,260 (1,035,392)
Total comprehensive income (loss) for the year 104,489,719 $ 5,237 6,124,939 (12,805,619)
Subsidiaries with material non-controlling interests [member]        
Disclosure of detailed information about business combination [line items]        
Operating revenues 111,472,191   98,420,289 100,716,444
Operating costs and expenses 98,312,325   89,732,428 95,984,880
Operating income 13,159,866   8,687,861 4,731,564
Net income 7,787,388   5,051,145 3,809,694
Total comprehensive income 12,103,406   1,466,783 5,047,838
Distribution of the net profit (loss) to:        
Equity holders of the parent 3,986,412   2,565,733 1,942,944
Non-controllinginterest 3,800,976   2,485,412 1,866,750
Net income 7,787,388   5,051,145 3,809,694
Comprehensive income (loss) for the year attributable to:        
Equity holders of the parent 6,172,737   748,059 2,574,397
Non-controllinginterest 5,930,669   718,724 2,473,441
Total comprehensive income (loss) for the year $ 12,103,406   $ 1,466,783 $ 5,047,838