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Pensions and Post-Employment Benefits - Summary of Plan Assets Measured at Estimated Fair Value (Detail) - MXN ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Disclosure of fair value of plan assets [line items] |  |  |
Cash | $ 701 | $ 579 |
Investments in corporate bonds | 6,851 | 6,212 |
Investments in government bonds | 8,435 | 11,108 |
Total fixed-income securities | 15,987 | 17,899 |
Investment in marketable securities | 6,646 | 7,947 |
Other investments and private funds | 6,686 | 6,847 |
Total variable-income securities | 13,332 | 14,794 |
Total plan assets | 29,319 | 32,693 | $ 28,854
Level 1 [Member] |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Cash | 701 | 579 |
Investments in corporate bonds | 131 | 144 |
Investments in government bonds | 1,649 | 1,701 |
Total fixed-income securities | 2,481 | 2,424 |
Investment in marketable securities | 5,089 | 6,212 |
Other investments and private funds | 973 | 991 |
Total variable-income securities | 6,062 | 7,203 |
Total plan assets | 8,543 | 9,627 |
Level 2 [Member] |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Cash | 0 | 0 |
Investments in corporate bonds | 6,720 | 6,067 |
Investments in government bonds | 6,786 | 9,407 |
Total fixed-income securities | 13,506 | 15,474 |
Investment in marketable securities | 1,557 | 1,735 |
Other investments and private funds | 4,172 | 3,279 |
Total variable-income securities | 5,729 | 5,014 |
Total plan assets | 19,235 | 20,488 |
Level 3 [Member] |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Cash | 0 | 0 |
Investments in corporate bonds | 0 | 1 |
Investments in government bonds | 0 | 0 |
Total fixed-income securities | 0 | 1 |
Investment in marketable securities | 0 | 0 |
Other investments and private funds | 1,541 | 2,577 |
Total variable-income securities | 1,541 | 2,577 |
Total plan assets | $ 1,541 | $ 2,578 |

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