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Bank Loans and Notes Payable - Activity (Detail) € in Millions, $ in Millions |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 18, 2020 USD ($) | Feb. 12, 2020 USD ($) | Jan. 22, 2020 USD ($) | Jan. 16, 2020 USD ($) | Mar. 14, 2016 EUR (€) | Jun. 30, 2020 MXN ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 MXN ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2020 MXN ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 MXN ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  | $ 114,016,000,000 |  | $ 184,196,000,000 |  |
Exchange differences on the translation of foreign operations and equity accounted investees |  |  |  |  |  |  | $ 25 | $ 489,000,000 | (12,556,000,000) | $ (13,174,000,000) |  |  |
Repayment of borrowings | $ 500 |  | $ 900 |  |  |  |  |  |  |  |  |  |
Gains (losses) on hedges of net investments in foreign operations, net of tax |  |  |  |  |  |  | $ 53 | 1,060,000,000 | 991,000,000 | $ 724,000,000 |  |  |
Mexican peso [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Credit contracts |  |  |  |  |  |  |  | 15,650,000,000 | $ 9,400,000,000 |  |  |  |
Mexican peso [member] | Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate |  |  |  |  |  |  |  |  | 8.39% |  |  |  |
Mexican peso [member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate |  |  |  |  |  |  |  |  | 7.91% |  |  |  |
Mexican peso [member] | Weighted average [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate |  |  |  |  |  |  | 6.04% |  |  |  | 6.04% |  |
Argentine peso [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Credit contracts |  |  |  |  |  |  |  | 711,000,000 |  |  |  |  |
Uruguayan peso [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Credit contracts |  |  |  |  |  |  |  | 759,000,000 |  |  |  |  |
Uruguay, Colombia And Argentina [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Credit contracts |  |  |  |  |  |  |  |  | $ 1,670,000,000 |  |  |  |
Argentina And Colombia [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Credit contracts |  |  |  |  |  |  |  | 1,184,000,000 |  |  |  |  |
1.75% Senior Notes Maturing 2023 [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount | € |  |  |  |  | € 1,000 |  |  |  |  |  |  |  |
Borrowings Term |  |  |  |  | 7 years |  |  |  |  |  |  |  |
Fixed interest rate |  |  |  |  | 1.75% |  |  |  |  |  |  |  |
Basis points over the relevant benchmark |  |  |  |  | 155 |  |  |  |  |  |  |  |
Total yield percentage |  |  |  |  | 1.824% |  |  |  |  |  |  |  |
Exchange differences on the translation of foreign operations and equity accounted investees |  |  |  |  |  |  |  | 2,379,000,000 |  |  |  |  |
3.500% Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  | $ 300 |  | $ 1,500 |  |  |  |  |  |  |  | $ 700 |
Fixed interest rate |  | 3.50% |  | 3.50% |  |  |  |  |  |  |  | 3.50% |
Basis points over the relevant benchmark |  | 137.5 |  | 130 |  |  |  |  |  |  |  |  |
Total yield percentage |  |  |  |  |  |  | 3.577% |  |  |  | 3.577% |  |
Percentage of implicit weighted performance |  |  |  |  |  | $ 3.358 |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  | $ 1,800 |  |  |  |  |  |
Gains (losses) on hedges of net investments in foreign operations, net of tax |  |  |  |  |  |  |  | $ 3,439,000,000 |  |  |  |  |
8.27% Debt Bonds Maturing 2021 [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  |  | $ 2,500,000,000 |  |
Fixed interest rate |  |  |  |  |  |  | 8.27% |  |  |  | 8.27% |  |
5.46% Debt Bonds Maturing 2023 [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  |  | $ 7,500,000,000 |  |
Fixed interest rate |  |  |  |  |  |  | 5.46% |  |  |  | 5.46% |  |
2.75% Senior Notes Maturing 2030 |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  | $ 1,250 |  |  |  |  |  |
Fixed interest rate |  |  |  |  |  |  | 2.75% |  |  |  | 2.75% |  |
5.25% Senior Notes Maturing 2043 |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  | $ 600 |  |  |  |  |  |
Fixed interest rate |  |  |  |  |  |  | 5.25% |  |  |  | 5.25% |  |
1.85% Senior Notes Maturing 2032 |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  | $ 705 |  |  |  |  |  |
Fixed interest rate |  |  |  |  |  |  | 1.85% |  |  |  | 1.85% |  |
Variable Rate Notes Maturing 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  |  | $ 1,500,000,000 |  |
Basis points over the relevant benchmark |  |  |  |  |  |  | 0.25% | 0.25% |  |  |  |  |
7.87% debt bonds Maturing 2027 |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  |  | $ 8,500,000,000 |  |
Fixed interest rate |  |  |  |  |  |  | 7.87% |  |  |  | 7.87% |  |
Seven Point Three Five Percentage Debt Bonds Maturing On Two Thousand Twenty Eight [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  |  | $ 3,000,000,000 |  |
Fixed interest rate |  |  |  |  |  |  | 7.35% |  |  |  | 7.35% |  |
T I I E Plus Zero Point Zero Eight Percentage Debt Bonds Maturing On Two Thousand Twenty Five [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  |  | $ 1,727,000,000 |  |
Basis points over the relevant benchmark |  |  |  |  |  |  | 0.08% | 0.08% |  |  |  |  |
Bank loans, short-term | Mexican peso [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,000,000,000

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