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Business Combinations, Acquisitions, Sale and Non-controlling Interest - Summary of 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 detailed information about business combination [line items] |  |  |  |
Operating costs and 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
Net income | 54,516,823 | 2,770 | 32,155,333 | 12,078,739
Total comprehensive income | (12,805,619) | (651) | 7,434,083 | 127,726,244
Distribution of the net profit (loss) to: |  |  |  |
Equity holders of the parent | 52,566,197 | 2,670 | 29,325,921 | 8,649,427
Non-controllinginterest | 1,950,626 | 100 | 2,829,412 | 3,429,312
Net income | 54,516,823 | 2,770 | 32,155,333 | 12,078,739
Comprehensive income (loss) for the year attributable to: |  |  |  |
Equity holders of the parent | (11,770,227) | (598) | 1,201,698 | 120,974,842
Non-controllinginterest | (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
Subsidiaries with material non-controlling interests [member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Operating revenues | 100,716,444 |  | 93,644,173 | 85,185,177
Operating costs and expenses | 95,984,880 |  | 86,920,692 | 81,590,233
Operating income | 4,731,564 |  | 6,723,481 | 3,594,944
Net income | 3,809,694 |  | 5,656,132 | 7,065,770
Total comprehensive income | 5,047,838 |  | 7,737,797 | 8,450,837
Distribution of the net profit (loss) to: |  |  |  |
Equity holders of the parent | 1,942,944 |  | 2,884,627 | 3,241,556
Non-controllinginterest | 1,866,750 |  | 2,771,505 | 3,824,214
Net income | 3,809,694 |  | 5,656,132 | 7,065,770
Comprehensive income (loss) for the year attributable to: |  |  |  |
Equity holders of the parent | 2,574,397 |  | 3,978,263 | 4,311,801
Non-controllinginterest | 2,473,441 |  | 3,759,534 | 4,139,036
Total comprehensive income (loss) for the year | $ 5,047,838 |  | $ 7,737,797 | $ 8,450,837

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