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Income Taxes - Summary of Tax Losses Carryforwards and their Years of Expiration (Detail) $ in Millions | Dec. 31, 2020 MXN ($)
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Major components of tax expense (income) [abstract] |
2024 | $ 63
2025 | 734
2026 | 1,831
2027 | 0
2028 | 2,222
2029 | 3,136
2030 and thereafter | 1,071
No expiration (Brazil) | 12,465
Tax loss carryforwards | $ 21,522

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