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Trade Receivable, Net - Aging Analysis of Accounts Receivable (Detail) - MXN ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of Aging Analysis of Accounts Receivable [Line Items] |  |
Trade receivables past due but not impaired | $ 14,847 | $ 17,576
Current [member] |  |
Disclosure of Aging Analysis of Accounts Receivable [Line Items] |  |
Trade receivables past due but not impaired | 12,578 | 15,314
Not later than one month [member] |  |
Disclosure of Aging Analysis of Accounts Receivable [Line Items] |  |
Trade receivables past due but not impaired | 1,045 | 1,550
1-30 days [member] |  |
Disclosure of Aging Analysis of Accounts Receivable [Line Items] |  |
Trade receivables past due but not impaired | 193 | 129
31-60 days [Member] |  |
Disclosure of Aging Analysis of Accounts Receivable [Line Items] |  |
Trade receivables past due but not impaired | 310 | 45
61-90 days [Member] |  |
Disclosure of Aging Analysis of Accounts Receivable [Line Items] |  |
Trade receivables past due but not impaired | 17 | 23
91-120 days [Member] |  |
Disclosure of Aging Analysis of Accounts Receivable [Line Items] |  |
Trade receivables past due but not impaired | $ 704 | $ 515

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