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Financial Instruments - Disclosure of Outstanding Cross Currency Swap Agreements (Detail) - Cross-currency swaps [member] - MXN ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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0-1 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional Amount | $ 4,615 | $ 4,738
Fair Value Asset | 502 | 502
1-2 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional Amount | 17,569 | 18,126
Fair value Liability | (289) | (378)
Fair Value Asset | 554 | 1,015
2-3 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional Amount | 4,659 | 4,774
Fair Value Asset | 578 | 615
3-4 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional Amount | 391 |
Fair value Liability | (7) |
Fair Value Asset | 1 |
4-5 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional Amount | 23,654 | 396
Fair value Liability | (783) | (7)
Fair Value Asset | 7,461 |
5-6 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional Amount | 695 |
Fair value Liability | (39) |
Later than seven years and not later than eight years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional Amount | 803 | 23,948
Fair value Liability | (167) | (396)
Fair Value Asset |  | 7,818
8-9 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional Amount | 6,709 | 813
Fair value Liability | (401) | (154)
9-10 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional Amount |  | 6,889
Fair value Liability |  | (42)
Fair Value Asset |  | $ 202
10-11 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional Amount | 1,527 |
Fair Value Asset | 18 |
24-25 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional Amount | 8,869 |
Fair Value Asset | $ 601 |

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