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Bank Loans and Notes Payable - Summary of Financial Instruments by Type of Interest Rate (Parenthetical) (Detail) - U.S. dollars to Mexican pesos [member] $ in Millions	12 Months Ended
	Dec. 31, 2018 MXN ($)
Cross-currency swaps [member] | Fixed rate debt [member]
Disclosure of financial instruments by type of interest rate [line items]
Units of investment, percentage	4.00%
Cross-currency swaps [member] | Variable rate debt [member]
Disclosure of financial instruments by type of interest rate [line items]
Units of investment, percentage	9.80%
Interest rate swap [member]
Disclosure of financial instruments by type of interest rate [line items]
Notional amount	$ 11,403
Interest rate swap [member] | Fixed rate debt [member]
Disclosure of financial instruments by type of interest rate [line items]
Interest rate percentage	9.8
Interest rate swap [member] | Variable rate debt [member]
Disclosure of financial instruments by type of interest rate [line items]
Interest rate percentage	7.2

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- Definition

The basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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