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v3.19.1

Subsequent Events - Additional Information (Detail) |  |  | 12 Months Ended
--- | --- | --- | ---
Mar. 14, 2019 MXN ($) | Jan. 14, 2019 MXN ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($)
Disclosure of Capital Stock [line items] |  |  |  |  |
Dividends declared per share |  |  | $ (7,038,000,000) | $ (6,992,000,000) | $ (7,014,000,000)
Mexico [member] |  |  |  |  |
Disclosure of Capital Stock [line items] |  |  |  |  |
Bank loans paid |  | $ 4,700,000,000 |  |  |
BBVA Bancomer [member] | Mexico [member] |  |  |  |  |
Disclosure of Capital Stock [line items] |  |  |  |  |
Bank loans paid |  | 1,300,000,000 |  |  |
Scotiabank [member] | Mexico [member] |  |  |  |  |
Disclosure of Capital Stock [line items] |  |  |  |  |
Bank loans paid |  | 2,100,000,000 |  |  |
Citi Banamex [member] | Mexico [member] |  |  |  |  |
Disclosure of Capital Stock [line items] |  |  |  |  |
Bank loans paid |  | $ 1,300,000,000 |  |  |
Dividends declared [member] |  |  |  |  |
Disclosure of Capital Stock [line items] |  |  |  |  |
Dividends declared per share | $ 3.54 |  |  |  |
Number of equal installments dividend to be paid | 2 |  |  |  |

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