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v3.20.1

Stockholders' equity: (Tables) | 12 Months Ended
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Dec. 31, 2019
Stockholders' equity: |
Stockholders' equity: |
|  |  |  |  |  |  |  | Capital stock as of
|  | Total shares |  | December 31,
Description |  | 2018 |  | 2019 |  | 2018 |  | 2019
“B” Series |  |  | 277,050,000 |  |  | 277,050,000 |  | Ps. | 7,173,079 |  | Ps. | 7,173,079
“BB” Series |  |  | 22,950,000 |  |  | 22,950,000 |  |  | 594,197 |  |  | 594,197
Total |  |  | 300,000,000 |  |  | 300,000,000 |  | Ps. | 7,767,276 |  | Ps. | 7,767,276

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- Definition The disclosure of classes of share capital. [Refer: Share capital [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 79 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_79_a&doctype=Standard -URIDate 2019-03-27 + Details
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