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Stockholders' Equity: Additional information (Details) - MXN ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Apr. 26, 2018 | Apr. 26, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Stockholders' Equity |  |  |  |  |
Capital stock |  |  | $ 7,767,276 | $ 7,767,276 |
Capital redemption reserve |  |  | 9,862,262 | 11,554,572 |
Dividends paid, classified as financing activities | $ 2,034,000 | $ 1,848,000 | $ 3,000,000 | 2,034,000 | $ 1,848,000
Dividend Declared, Tax on Dividends, Percentage |  |  | 42.86% |  |
Retained earnings |  |  | $ 10,438,563 | 9,919,989 |
Additional paid-in capital |  |  | 42,825,290 | 41,606,425 |
Capital Contribution |  |  | 12,900,414 | 11,382,509 |
Fixed Capital Shares [Member] |  |  |  |  |
Stockholders' Equity |  |  |  |  |
Capital stock |  |  | 1,000 | 1,000 |
Variable Capital Shares [Member] |  |  |  |  |
Stockholders' Equity |  |  |  |  |
Capital stock |  |  | $ 7,766,276 | $ 7,766,276 |

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