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Cash and cash equivalents: (Tables) | 12 Months Ended
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Dec. 31, 2020
Cash and cash equivalents: |
Schedule of cash and cash equivalents |
|  | December 31,
|  | 2019 |  | 2020
Cash and cash held at banks |  | Ps. | 3,642,037 |  | Ps. | 3,514,293
Short term investments |  |  | 2,550,642 |  |  | 1,678,335
Total cash and cash equivalents |  | Ps. | 6,192,679 |  | Ps. | 5,192,628

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