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Financial Instruments - Disclosure of Outstanding Cross Currency Swap Agreements (Detail) - Cross-currency swaps [member] - MXN ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Less than 1 year [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | $ 4,738 | $ 24,760
Fair Value Liability |  | (3,878)
Fair Value Asset | 502 |
1-2 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 18,126 | 6,263
Fair Value Liability | (378) | (205)
Fair Value Asset | 1,015 |
2-3 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 4,774 | 18,428
Fair Value Liability |  | (927)
Fair Value Asset | 615 | 567
4-5 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 396 |
Fair Value Liability | (7) |
Later than seven years and not later than eight years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 23,948 |
Fair Value Liability | (396) |
Fair Value Asset | 7,818 |
8-9 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 813 | 888
Fair Value Liability | (154) | (192)
9-10 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 6,889 | 6,907
Fair Value Liability | (42) |
Fair Value Asset | $ 202 | 51
3-4 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount |  | 4,853
Fair Value Liability |  | (12)
Fair Value Asset |  | 24
5-6 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount |  | 14,446
Fair Value Asset |  | $ 8,336

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