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Debt - Summary of Senior Notes Outstanding (Detail) - MXN ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of Senior Notes Outstanding [Line Items] |  |
Borrowings | $ 624,254,477 | $ 638,922,453
U.S. dollars [member] |  |
Disclosure of Senior Notes Outstanding [Line Items] |  |
Borrowings | 169,142,643 | 184,089,282
Mexican pesos [member] |  |
Disclosure of Senior Notes Outstanding [Line Items] |  |
Borrowings | 58,129,292 | 68,001,125
Euros [member] |  |
Disclosure of Senior Notes Outstanding [Line Items] |  |
Borrowings | 222,190,375 | 236,548,891
Pound sterling [member] |  |
Disclosure of Senior Notes Outstanding [Line Items] |  |
Borrowings | 54,962,779 | 55,223,526
Japanese yens [member] |  |
Disclosure of Senior Notes Outstanding [Line Items] |  |
Borrowings | 2,255,663 | 2,334,864
Brazilian reais [member] |  |
Disclosure of Senior Notes Outstanding [Line Items] |  |
Borrowings | 34,948,736 | 32,891,187
Chilean pesos [member] |  |
Disclosure of Senior Notes Outstanding [Line Items] |  |
Borrowings | 3,562,695 | 3,904,707
Senior Notes 1 [member] | U.S. dollars [member] |  |
Disclosure of Senior Notes Outstanding [Line Items] |  |
Borrowings | 169,142,643 | 184,089,282
Senior Notes 1 [member] | Mexican pesos [member] |  |
Disclosure of Senior Notes Outstanding [Line Items] |  |
Borrowings | 58,129,292 | 68,001,125
Senior Notes 1 [member] | Euros [member] |  |
Disclosure of Senior Notes Outstanding [Line Items] |  |
Borrowings | 222,190,375 | 236,548,891
Senior Notes 1 [member] | Pound sterling [member] |  |
Disclosure of Senior Notes Outstanding [Line Items] |  |
Borrowings | 54,962,779 | 55,223,526
Senior Notes 1 [member] | Japanese yens [member] |  |
Disclosure of Senior Notes Outstanding [Line Items] |  |
Borrowings | 2,255,663 | 2,334,864
Senior Notes 1 [member] | Brazilian reais [member] |  |
Disclosure of Senior Notes Outstanding [Line Items] |  |
Borrowings | 34,948,736 | 32,891,187
Senior Notes 1 [member] | Chilean pesos [member] |  |
Disclosure of Senior Notes Outstanding [Line Items] |  |
Borrowings | $ 3,562,695 | $ 3,904,707

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