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Financial Instruments - Cross Currency Swaps (Detail) - Cross-currency swaps [member] - MXN ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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0-1 year [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | $ 4,575 | $ 17,252
Fair value Liability | (5) | (307)
Fair Value Asset | 169 | 883
Second 12 months |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 376 | 702
Fair Value Asset | 23 | 49
Third 12 months |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 24,103 | 375
Fair Value Asset | 10,808 | 3
Fourth 12 months |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 1,577 | 23,466
Fair value Liability | (9) | (594)
Fair Value Asset | 264 | 7,122
Fifth 12 months |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 10,750 | 1,788
Fair value Liability | (2,481) | (53)
Seventh 12 months |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 6,982 | 772
Fair value Liability | (464) | (63)
Fair Value Asset | 80 |
Eighth 12 months |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount |  | 6,596
Fair value Liability |  | (843)
Ninth 12 months |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 1,519 |
Fair Value Asset | 122 |
Tenth 12 months |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 3,790 | 1,371
Fair value Liability | (107) |
Fair Value Asset | 192 | 121
22-23 years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 8,869 | 8,869
Fair Value Asset | $ 2,706 | $ 576

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