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Financial Assets and Liabilities - Summary of changes in liabilities arising from financing activities (Detail) - MXN ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Beginning balance | $ 638,922,453 | $ 697,884,899
Beginning balance | 119,387,660 |
Cash flow | (18,491,635) | (34,050,923)
Foreign currency exchange and other | 5,032,732 | (24,911,523)
Ending balance | 744,851,210 | 638,922,453
Debt [member] |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Beginning balance | 638,922,453 |
Cash flow | 8,273,440 |
Foreign currency exchange and other | (22,941,416) |
Ending balance | 624,254,477 | $ 638,922,453
Liability Related to Right of Use of Assets [Member] |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Beginning balance | 119,387,660 |
Cash flow | (26,765,075) |
Foreign currency exchange and other | 27,974,148 |
Ending balance | $ 120,596,733 |

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- Definition Liabilities arising from financing activities adjusted balance. + References No definition available. + Details
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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 increase (decrease) in liabilities arising from financing activities resulting from the effect of changes in foreign exchange rates. [Refer: Liabilities arising from financing activities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 44B -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_44B_c&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The increase (decrease) in liabilities arising from financing activities resulting from financing cash flows. [Refer: Cash flows from (used in) financing activities; Liabilities arising from financing activities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 44B -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_44B_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of liabilities for which cash flows were, or future cash flows will be, classified in the statement of cash flows as cash flows from financing activities. [Refer: Cash flows from (used in) financing activities; Liabilities] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 44D -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_44D&doctype=Standard -URIDate 2019-03-27 + Details
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