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Balances and Transactions in Foreign Currencies - Summary of Transactions in Foreign Currencies (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Balances and Transactions in Foreign Currencies [line items]      
Revenues $ 7,228 $ 1,909 $ 4,103
Other Operating Revenues 139 1,679 1,431
Purchases of Raw Materials 21,523 16,407 15,065
Interest Expense 2,743 2,986 3,678
Consulting Fees 774 302 410
Asset Acquisitions 2,166 276 407
Other 2,677 4,072 3,348
U.S. dollars [member]      
Disclosure of Balances and Transactions in Foreign Currencies [line items]      
Revenues 7,228 1,909 4,068
Other Operating Revenues 130 1,677 1,281
Purchases of Raw Materials 21,460 16,320 14,961
Interest Expense 2,309 2,534 3,173
Consulting Fees 752 267 182
Asset Acquisitions 2,166 272 407
Other 2,676 4,052 3,339
Euro [member]      
Disclosure of Balances and Transactions in Foreign Currencies [line items]      
Revenues     6
Other Operating Revenues   2  
Purchases of Raw Materials 63 87 104
Interest Expense 434 452 355
Consulting Fees 20 23 43
Asset Acquisitions   4  
Other 1 20 5
Other currencies [member]      
Disclosure of Balances and Transactions in Foreign Currencies [line items]      
Revenues     29
Other Operating Revenues 9   150
Interest Expense     150
Consulting Fees $ 2 $ 12 185
Other     $ 4