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Trade Receivable, Net - Aging Analysis of Accounts Receivable (Detail) - MXN ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of Aging Analysis of Accounts Receivable [Line Items] |  |
Trade receivables past due but not impaired | $ 11,523 | $ 15,476
0 days |  |
Disclosure of Aging Analysis of Accounts Receivable [Line Items] |  |
Trade receivables past due but not impaired | 9,905 | 12,630
1-30 days |  |
Disclosure of Aging Analysis of Accounts Receivable [Line Items] |  |
Trade receivables past due but not impaired | 769 | 1,448
31-60 days |  |
Disclosure of Aging Analysis of Accounts Receivable [Line Items] |  |
Trade receivables past due but not impaired | 298 | 672
61-90 days |  |
Disclosure of Aging Analysis of Accounts Receivable [Line Items] |  |
Trade receivables past due but not impaired | 65 | 153
91-120 days |  |
Disclosure of Aging Analysis of Accounts Receivable [Line Items] |  |
Trade receivables past due but not impaired | 44 | 90
121 + days |  |
Disclosure of Aging Analysis of Accounts Receivable [Line Items] |  |
Trade receivables past due but not impaired | $ 442 | $ 483

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