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Equity - Additional Information (Detail) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 31, 2019 | Dec. 31, 2019 MXN ($) $ / shares shares | Dec. 31, 2018 MXN ($) shares | Dec. 31, 2017 MXN ($) shares
Disclosure of classes of share capital [line items] |  |  |  |
Capital stock |  | 16,806,658,000 | 16,806,658,000 | 16,806,658,000
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 | $ |  | $ 187 | $ 164 | $ 164
Balance in legal reserve fund | $ |  | $ 12,239 |  |
Reverse Stock Split [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Stock split conversion ratio | 0.125 |  |  |
Ordinary shares [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Capital stock |  | 16,806,658,096 |  |
Fixed capital stock (nominal value) per share | $ / shares |  | $ 934 |  |
Common shares, no par value | $ / shares |  | $ 0 |  |
Series A shares [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Capital stock |  | 7,936,628,000 | 7,936,628,000 | 7,936,628,000
Equity threshold percentage |  | 50.10% |  |
Series D share [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Capital stock |  | 4,668,366,000 | 4,668,366,000 | 4,668,366,000
Equity threshold percentage |  | 49.90% |  |

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