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Share capital - Additional Information (Detail) - MXN ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of classes of share capital [line items] |  |  |
Capital stock | 2,100,832,000 | 2,100,832,000 | 2,072,922,000
Percentage of income to be transferred to reserve | 5.00% |  |
Minimum percentage of capital stock at nominal value to be transferred to reserve | 20.00% |  |
Amount in legal reserve | $ 164 | $ 164 | $ 164
Balance in legal reserve fund | $ 8,918 |  |
Ordinary shares [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Capital stock | 2,100,832,262 |  |
Fixed capital stock (nominal value) per share | $ 934 |  |
Common shares, no par value | $ 0 |  |
Series A shares [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Capital stock | 992,078,000 | 992,078,000 | 992,078,000
Equity threshold percentage | 51.00% |  |
Series D share [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Capital stock | 583,546,000 | 583,546,000 | 583,546,000
Equity threshold percentage | 49.00% |  |

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