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Financial Instruments - Disclosure of Outstanding Cross Currency Swap Agreements (Detail) - Cross-currency swaps [member] - MXN ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Less than 1 year [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | $ 24,760 | $ 2,707
Fair Value Liability | (3,878) | (10)
Fair Value Asset |  | 1,165
1-2 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 6,263 | 39,262
Fair Value Liability | (205) | (4,837)
Fair Value Asset |  | 3,688
2-3 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 18,428 | 7,022
Fair Value Liability | (927) | (265)
Fair Value Asset | 567 |
3-4 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 4,853 | 19,474
Fair Value Liability | (12) | (842)
Fair Value Asset | 24 | 798
5-6 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 14,446 |
Fair Value Asset | 8,336 |
8-9 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 888 |
Fair Value Liability | (192) |
9-10 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 6,907 | 925
Fair Value Liability |  | (131)
Fair Value Asset | $ 51 |
4-5 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount |  | 5,076
Fair Value Liability |  | (128)
Fair Value Asset |  | 28
6-7 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount |  | 12,670
Fair Value Asset |  | 9,057
10-11 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount |  | 5,476
Fair Value Asset |  | $ 125

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