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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
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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 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

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