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Financial Instruments - Disclosure of Outstanding Cross Currency Swap Agreements (Detail) - Cross-currency swaps [member] - MXN ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Less than 1 year [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | $ 17,252 | $ 4,738
Fair Value Liability | (307) |
Fair Value Asset | 883 | 502
1-2 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 702 | 18,126
Fair Value Liability |  | (378)
Fair Value Asset | 49 | 1,015
2-3 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 375 | 4,774
Fair Value Asset | 3 | 615
3-4 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 23,466 |
Fair Value Liability | (594) |
Fair Value Asset | 7,122 |
4-5 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 1,788 | 396
Fair Value Liability | (53) | (7)
Later than seven years and not later than eight years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 772 | 23,948
Fair Value Liability | (63) | (396)
Fair Value Asset |  | 7,818
8-9 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 6,596 | 813
Fair Value Liability | (843) | (154)
9-10 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 1,371 | 6,889
Fair Value Liability |  | (42)
Fair Value Asset | 121 | $ 202
24-25 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 8,869 |
Fair Value Asset | $ 576 |

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- Definition The fair value of financial assets. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_25&doctype=Standard -URIDate 2019-03-27 + Details
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