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Equity (Detail) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 MXN ($) item shares | Dec. 31, 2019 MXN ($) shares
Disclosure of classes of share capital [line items] |  |
Capital stock issued | 3,578,226,270 |
Common stock outstanding | 17,891,131,350 | 17,891,131,350
Fixed capital stock amounts | $ | $ 300 | $ 300
Variable capital, maximum multiple of fixed capital | item | 10 |
BD units [member] |  |
Disclosure of classes of share capital [line items] |  |
Capital stock issued | 2,161,177,770 |
Common stock outstanding | 10,805,888,850 |
Number Of Series Shares For Each Share Unit | item | 1 |
B units [member] |  |
Disclosure of classes of share capital [line items] |  |
Capital stock issued | 1,417,048,500 |
Common stock outstanding | 7,085,242,500 |
Minimum percentage for voting | 51.00% |
Series B shares [member] |  |
Disclosure of classes of share capital [line items] |  |
Number Of Series Shares For Each Share Unit | item | 5 |
Series D shares [member] |  |
Disclosure of classes of share capital [line items] |  |
Maximum percentage for voting right | 49.00% |
Series L shares [member] |  |
Disclosure of classes of share capital [line items] |  |
Maximum percentage for voting right | 25.00% |
Sub series D B shares |  |
Disclosure of classes of share capital [line items] |  |
Number Of Series Shares For Each Share Unit | item | 2 |
Sub series D-L shares [member] |  |
Disclosure of classes of share capital [line items] |  |
Maximum percentage for voting right | 25.00% |
Number Of Series Shares For Each Share Unit | item | 2 |
Non cumulative premium [member] |  |
Disclosure of classes of share capital [line items] |  |
Dividend payable, premium, as percentage of non-premium dividend | 125.00% |

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