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Bank Loans and Notes Payables - Summary of Reconciliation of Liabilities Arising From Financing Activities (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) | [1] | Dec. 31, 2020 MXN ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($)
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |  |
Carrying value |  | $ 71,360 | $ 83,603 |  |
Cash flows, Repayments | $ (2,272) | (45,187) | (20,460) | [2] | $ (15,957)
Repayments of borrowings and lease liabilities |  | (45,760) | (20,952) |  |
Cash flows, Proceeds | $ 3,132 | 62,297 | 10,736 | [2] | 15,426
Non-cash impact , New leases |  | 599 | 215 |  |
Non-cash Impacts, Others |  | 34 | (21) |  |
Non-cash Impacts, Foreign Exchange movements |  | 1,005 | (1,627) |  |
Non-cash Impacts, Translation Effect |  | (750) | (594) |  |
Carrying value |  | 88,784 | 71,360 |  | 83,603
Long-term lease liabilities |  |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |  |
Non-cash Impacts, Others |  |  | 0 |  |
Short-term Borrowings |  |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |  |
Carrying value |  | 882 | 1,382 |  |
Cash flows, Repayments |  | (17,641) | (852) |  |
Cash flows, Proceeds |  | 18,525 | 503 |  |
Non-cash impact , New leases |  | 0 | 0 |  |
Non-cash Impacts, Others |  | 0 | 0 |  |
Non-cash Impacts, Foreign Exchange movements |  | 0 | 0 |  |
Non-cash Impacts, Translation Effect |  | (121) | (151) |  |
Carrying value |  | 1,645 | 882 |  | 1,382
Short-term Borrowings | Short-term bank loans |  |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |  |
Carrying value |  | 882 | 1,382 |  |
Cash flows, Repayments |  | (17,641) | (852) |  |
Cash flows, Proceeds |  | 18,525 | 503 |  |
Non-cash impact , New leases |  | 0 | 0 |  |
Non-cash Impacts, Others |  | 0 | 0 |  |
Non-cash Impacts, Foreign Exchange movements |  | 0 | 0 |  |
Non-cash Impacts, Translation Effect |  | (121) | (151) |  |
Carrying value |  | 1,645 | 882 |  | 1,382
Short-term Borrowings | Short-term notes payable |  |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |  |
Carrying value |  | 0 | 0 |  |
Cash flows, Repayments |  | 0 | 0 |  |
Cash flows, Proceeds |  | 0 | 0 |  |
Non-cash impact , New leases |  | 0 | 0 |  |
Non-cash Impacts, Others |  | 0 | 0 |  |
Non-cash Impacts, Foreign Exchange movements |  | 0 | 0 |  |
Non-cash Impacts, Translation Effect |  |  | 0 |  |
Carrying value |  | 0 | 0 |  | 0
Long-term Borrowings |  |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |  |
Carrying value |  | 69,095 | 80,423 |  |
Cash flows, Repayments |  | (27,546) | (19,608) |  |
Cash flows, Proceeds |  | 43,772 | 10,233 |  |
Non-cash impact , New leases |  | 0 | 0 |  |
Non-cash Impacts, Others |  | 0 | 0 |  |
Non-cash Impacts, Foreign Exchange movements |  | 1,018 | (1,590) |  |
Non-cash Impacts, Translation Effect |  | (506) | (363) |  |
Carrying value |  | 85,833 | 69,095 |  | 80,423
Long-term Borrowings | Long-term bank loans |  |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |  |
Carrying value |  | 11,576 | 16,572 |  |
Cash flows, Repayments |  | (896) | (14,926) |  |
Cash flows, Proceeds |  | 293 | 10,233 |  |
Non-cash impact , New leases |  | 0 | 0 |  |
Non-cash Impacts, Others |  | 0 | 0 |  |
Non-cash Impacts, Foreign Exchange movements |  | 0 | 0 |  |
Non-cash Impacts, Translation Effect |  | (405) | (303) |  |
Carrying value |  | 10,568 | 11,576 |  | 16,572
Long-term Borrowings | Long-term notes payable |  |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |  |
Carrying value |  | 57,519 | 63,841 |  |
Cash flows, Repayments |  | (26,650) | (4,674) |  |
Cash flows, Proceeds |  | 43,479 | 0 |  |
Non-cash impact , New leases |  | 0 | 0 |  |
Non-cash Impacts, Others |  | 0 | 0 |  |
Non-cash Impacts, Foreign Exchange movements |  | 1,018 | (1,589) |  |
Non-cash Impacts, Translation Effect |  | (101) | (59) |  |
Carrying value |  | 75,265 | 57,519 |  | 63,841
Long-term Borrowings | Long-term lease liabilities |  |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |  |
Carrying value |  | 0 | 10 |  |
Cash flows, Repayments |  |  | (8) |  |
Cash flows, Proceeds |  |  | 0 |  |
Non-cash impact , New leases |  |  | 0 |  |
Non-cash Impacts, Foreign Exchange movements |  |  | (1) |  |
Non-cash Impacts, Translation Effect |  |  | (1) |  |
Carrying value |  |  | 0 |  | 10
Lease liabilities |  |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |  |
Carrying value |  | 1,383 | 1,798 |  |
Payments of lease liabilities, classified as financing activities |  | (573) | (492) |  |
Cash flows, Proceeds |  | 0 | 0 |  |
Non-cash impact , New leases |  | 599 | 215 |  |
Non-cash Impacts, Others |  | 34 | (21) |  |
Non-cash Impacts, Foreign Exchange movements |  | (13) | (37) |  |
Non-cash Impacts, Translation Effect |  | (123) | (80) |  |
Carrying value |  | $ 1,306 | $ 1,383 |  | $ 1,798
[1] | Convenience translation to U.S. dollars ($) – See Note 2.2.3
[2] | The Company initially adopted IFRS 16 at January 1, 2019 using the modified retrospective approach under which the comparative information is not restated. – See Note 3.18

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