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Bonus Programs - Additional Information (Detail) - MXN ($) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Percentage of bonus | 50.00% |  |
Percentage of annual bonus | 50.00% |  |
Compensation expense | $ 351 | $ 468 | $ 463
Fair value of shares held by trust | 673 | 712 |
Top of range [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Percentage of economic value added | 70.00% |  |
Bottom of range [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Percentage of economic value added | 30.00% |  |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Details
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- Details
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