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Pensions and Post-Employment Benefits - Summary of Plan Assets Measured at Estimated Fair Value (Detail) - MXN ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Disclosure of fair value of plan assets [line items] |  |  |
Cash | $ 690 | $ 2,099 |
Investments in corporate bonds | 6,212 | 3,667 |
Investments in government bonds | 11,108 | 10,290 |
Total fixed-income securities | 18,010 | 16,056 |
Investment in marketable securities | 7,947 | 7,957 |
Other investments and private funds | 6,736 | 4,841 |
Total variable-income securities | 14,683 | 12,798 |
Total plan assets | 32,693 | 28,854 | $ 25,571
Level 1 [Member] |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Cash | 579 | 1,075 |
Investments in corporate bonds | 144 | 1,050 |
Investments in government bonds | 1,701 | 209 |
Total fixed-income securities | 2,424 | 2,334 |
Investment in marketable securities | 6,212 | 2,001 |
Other investments and private funds | 991 | 770 |
Total variable-income securities | 7,203 | 2,771 |
Total plan assets | 9,627 | 5,105 |
Level 2 [Member] |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Cash | 0 | 1,024 |
Investments in corporate bonds | 6,067 | 2,617 |
Investments in government bonds | 9,407 | 10,081 |
Total fixed-income securities | 15,474 | 13,722 |
Investment in marketable securities | 1,735 | 5,956 |
Other investments and private funds | 3,279 | 3,478 |
Total variable-income securities | 5,014 | 9,434 |
Total plan assets | 20,488 | 23,156 |
Level 3 [Member] |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Cash | 111 | 0 |
Investments in corporate bonds | 1 | 0 |
Investments in government bonds | 0 | 0 |
Total fixed-income securities | 112 | 0 |
Investment in marketable securities | 0 | 0 |
Other investments and private funds | 2,466 | 593 |
Total variable-income securities | 2,466 | 593 |
Total plan assets | $ 2,578 | $ 593 |

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