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Shareholders' Equity - Additional Information (Detail) $ / shares in Units, $ in Thousands, $ in Millions |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Apr. 16, 2018 $ / shares | Nov. 13, 2017 shares | Jul. 17, 2017 shares | Apr. 05, 2017 $ / shares | Jan. 03, 2018 MXN ($) | Dec. 31, 2018 MXN ($) shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 MXN ($) shares
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Capital requirements | $ |  |  |  |  |  | $ 270,049 |  |
Number of shares issued |  |  |  |  |  | 71,063,212,170 |  |
Number of shares outstanding |  |  |  |  |  | 66,034,792,526 |  | 66,069,035,539
Number of treasury shares held |  |  |  |  |  | 5,028,419,644 |  | 29,420,688,657
Merger transaction description |  |  |  |  |  | any transaction representing 20% or more of the Company’s consolidated assets | any transaction representing 20% or more of the Company’s consolidated assets |
Legal reserve | $ |  |  |  |  |  | $ 358,440 |  | $ 358,440
Amount of Mexican withholding tax |  |  |  |  |  | 10.00% | 10.00% |
Redemption of hybrid bond |  |  |  |  |  | $ (13,440,120) | $ (683) |
Hybrid Bonds [member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Redemption of hybrid bond | $ |  |  |  |  | $ 600,000 |  |  |
Payment for redemption of bond | $ |  |  |  |  | $ 13,440,120 |  |  |
Bottom of range [member] | Legal reserve [member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Increase in legal reserve |  |  |  |  |  | 5.00% | 5.00% |
Top of range [member] | Legal reserve [member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Increase in legal reserve |  |  |  |  |  | 20.00% | 20.00% |
Capital Stock Class AA Voting Rights [member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Number of shares issued |  |  |  |  |  | 20,601,632,660 |  |
Capital Stock Class A Voting Rights [member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Number of shares issued |  |  |  |  |  | 558,677,704 |  |
Capital Stock Class L Limited Voting Rights [member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Number of shares issued |  |  |  |  |  | 49,902,901,806 |  |
Capital Stock Class Aa [member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Number of shares outstanding |  |  |  |  |  | 20,601,632,660 |  | 20,601,632,660
Dividends paid | $ / shares | $ 0.32 |  |  | $ 0.30 |  |  |  |
Capital Stock Class Aa [member] | Bottom of range [member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Percentage of capital stock |  |  |  |  |  | 20.00% |  |
Capital Stock Class Aa [member] | Top of range [member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Percentage of capital stock |  |  |  |  |  | 51.00% |  |
Capital Stock Class A [member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Number of shares outstanding |  |  |  |  |  | 546,112,938 |  | 566,661,526
Dividends paid | $ / shares | 0.32 |  |  | 0.30 |  |  |  |
Capital Stock Class A [member] | Bottom of range [member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Percentage of capital stock |  |  |  |  |  | 19.60% |  |
Capital Stock Class A [member] | Top of range [member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Percentage of capital stock |  |  |  |  |  | 49.00% |  |
Capital Stock Class L [member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Number of shares outstanding |  |  |  |  |  | 44,887,046,928 |  | 44,900,741,353
Dividends paid | $ / shares | 0.32 |  |  | 0.30 |  |  |  |
Periodic payment of dividend | $ / shares | $ 0.16 |  |  | $ 0.15 |  |  |  |
Periodic payable date of dividend | July 16 and November 12 |  |  |  |  |  |  |
Number of additional shares |  | 16,905,414 | 325,264,125 |  |  |  |  |
Capital Stock Class L [member] | Top of range [member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Percentage of capital stock |  |  |  |  |  | 80.00% |  |
Class L [member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Number of treasury shares held |  |  |  |  |  | 5,028,399,396 |  | 29,419,120,359
Class A [member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Number of treasury shares held |  |  |  |  |  | 20,248 |  | 1,568,298

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