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Income Taxes - Available Tax Loss Carryforwards Recorded in Deferred Tax Assets (Detail) $ in Thousands | Dec. 31, 2020 MXN ($)
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Disclosure of tax losses available for carryforward [line items] |
Gross balance of available tax loss carryforwards at December 31, 2020 | $ 80,142,388
Tax-effected loss carryforward benefit | 25,121,933
Brazil [member] |
Disclosure of tax losses available for carryforward [line items] |
Gross balance of available tax loss carryforwards at December 31, 2020 | 44,578,152
Tax-effected loss carryforward benefit | 15,156,572
Mexico [member] |
Disclosure of tax losses available for carryforward [line items] |
Gross balance of available tax loss carryforwards at December 31, 2020 | 20,523,070
Tax-effected loss carryforward benefit | 6,156,920
Austria [member] |
Disclosure of tax losses available for carryforward [line items] |
Gross balance of available tax loss carryforwards at December 31, 2020 | 11,631,381
Tax-effected loss carryforward benefit | 2,907,845
United States [Member] |
Disclosure of tax losses available for carryforward [line items] |
Gross balance of available tax loss carryforwards at December 31, 2020 | 3,023,441
Tax-effected loss carryforward benefit | 786,095
Peru [member] |
Disclosure of tax losses available for carryforward [line items] |
Gross balance of available tax loss carryforwards at December 31, 2020 | 380,770
Tax-effected loss carryforward benefit | 112,327
Puerto Rico [member] |
Disclosure of tax losses available for carryforward [line items] |
Gross balance of available tax loss carryforwards at December 31, 2020 | 5,574
Tax-effected loss carryforward benefit | $ 2,174

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