Financial Instruments - Summarizes outstanding Cross Currency Swap Agreements (Detail) - MXN ($)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]
Fair Value Asset	$ 955,000,000	$ 4,615,000,000
Cross Currency Swaps [Member] \| 2018 [member] \| Cash flow hedges [member]
Disclosure of detailed information about financial instruments [line items]
Maturity Date	2018	2017
Notional Amount	$ 24,354,000,000	$ 207,000,000
Fair Value (Liability)	$ (3,863,000,000)	$ (10,000,000)
Cross Currency Swaps [Member] \| 2019 [member] \| Cash flow hedges [member]
Disclosure of detailed information about financial instruments [line items]
Maturity Date	2019	2018
Notional Amount	$ 6,263,000,000	$ 39,262,000,000
Fair Value (Liability)	$ (205,000,000)	(4,837,000,000)
Fair Value Asset		$ 3,688,000,000
Cross Currency Swaps [Member] \| 2020 [member] \| Cash flow hedges [member]
Disclosure of detailed information about financial instruments [line items]
Maturity Date	2020	2019
Notional Amount	$ 14,439,000,000	$ 7,022,000,000
Fair Value (Liability)	(163,000,000)	$ (265,000,000)
Fair Value Asset	$ 605,000,000
Cross Currency Swaps [Member] \| 2021 [member] \| Cash flow hedges [member]
Disclosure of detailed information about financial instruments [line items]
Maturity Date	2021	2020
Notional Amount	$ 4,046,000,000	$ 15,118,000,000
Fair Value (Liability)		(246,000,000)
Fair Value Asset	$ 24,000,000	$ 798,000,000
Cross Currency Swaps [Member] \| Later than five year and not later than six years [member] \| Cash flow hedges [member]
Disclosure of detailed information about financial instruments [line items]
Maturity Date	2023
Notional Amount	$ 1,776,000,000
Fair Value Asset	$ 139,000,000
Cross Currency Swaps [Member] \| Later than 5 years [member] \| Cash flow hedges [member]
Disclosure of detailed information about financial instruments [line items]
Maturity Date	2027	2027
Notional Amount	$ 6,907,000,000	$ 5,476,000,000
Fair Value (Liability)	(129,000,000)
Fair Value Asset	$ 179,000,000	$ 125,000,000
Cross Currency Swaps [Member] \| 2022 [member] \| Cash flow hedges [member]
Disclosure of detailed information about financial instruments [line items]
Maturity Date		2021
Notional Amount		$ 4,236,000,000
Fair Value (Liability)		$ (128,000,000)

The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

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

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 112
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Derivative instrument maturity date.

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