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Revenue from Contracts with Customers: Future lease income (Details) - MXN ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Future lease income: |  |  |
Lease payments receivable | $ 26,388,870 | $ 28,916,592 | $ 22,085,023
2018 |  |  |
Future lease income: |  |  |
Lease payments receivable |  |  | 3,986,487
2019 |  |  |
Future lease income: |  |  |
Lease payments receivable |  | 3,535,065 | 2,584,950
2020 |  |  |
Future lease income: |  |  |
Lease payments receivable | 3,427,985 | 3,257,229 | 2,358,698
2021 |  |  |
Future lease income: |  |  |
Lease payments receivable | 3,091,690 | 2,880,142 | 2,054,600
2022 |  |  |
Future lease income: |  |  |
Lease payments receivable | 2,995,000 | 2,861,442 | 4,159,744
2023 - 2029 |  |  |
Future lease income: |  |  |
Lease payments receivable | $ 16,874,195 | $ 16,382,714 | $ 6,940,544

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of undiscounted operating lease payments to be received. Operating lease is a lease that does not transfer substantially all the risks and rewards incidental to ownership of an underlying asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 97 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_97&doctype=Standard -URIDate 2019-03-27 + Details
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