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Financial Instruments - Impact of hedging on equity (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2020 MXN ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($)
Disclosure of detailed information about hedged items [line items] |  |  |  |
Beginning Balance |  | $ 325,751 |  |
Foreign currency revaluation of the net foreign operations | $ 53 | 1,060 | $ 991 | $ 724
Ending Balance | $ 15,442 | 307,187 | 325,751 |
Total controlling interest [member] |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |
Beginning Balance |  | 251,989 |  |
Ending Balance |  | 237,743 | 251,989 |
Non-controlling interest [member] |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |
Beginning Balance |  | 73,762 | 78,489 | 86,621
Ending Balance |  | 69,444 | 73,762 | 78,489
Impact Of Hedging Instruments [Member] |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |
Beginning Balance |  | (3) | 945 |
Financial instruments – purchases |  | (2,803) | (104) |
Change in fair value of financial instruments recognized in OCI |  | 7,387 | (1,591) |
Amount reclassified from OCI to profit or loss |  | 3,670 | 1,222 |
Foreign currency revaluation of the net foreign operations |  | (3,588) | (269) |
Effects of changes in foreign exchange rates |  | (1,846) | 64 |
Tax effect |  | (1,246) | (270) |
Ending Balance |  | 1,571 | (3) | 945
Impact Of Hedging Instruments [Member] | Total controlling interest [member] |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |
Beginning Balance |  | 534 | 1,065 |
Financial instruments – purchases |  | (2,632) | (33) |
Change in fair value of financial instruments recognized in OCI |  | 5,686 | (490) |
Amount reclassified from OCI to profit or loss |  | 2,726 | 591 |
Foreign currency revaluation of the net foreign operations |  | (3,588) | (176) |
Effects of changes in foreign exchange rates |  | 105 | 42 |
Tax effect |  | (977) | (465) |
Ending Balance |  | 1,854 | 534 | 1,065
Impact Of Hedging Instruments [Member] | Foreign exchange forward contracts [member] |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |
Beginning Balance |  | (156) | 53 |
Financial instruments – purchases |  | (840) | (244) |
Change in fair value of financial instruments recognized in OCI |  | (483) |  |
Amount reclassified from OCI to profit or loss |  | 277 | (68) |
Effects of changes in foreign exchange rates |  | 7 |  |
Tax effect |  | 163 | 103 |
Ending Balance |  | (1,032) | (156) | 53
Impact Of Hedging Instruments [Member] | Foreign currency option [Member] |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |
Beginning Balance |  |  | 17 |
Financial instruments – purchases |  | 2 | 2 |
Amount reclassified from OCI to profit or loss |  | (2) | (26) |
Tax effect |  |  | 7 |
Ending Balance |  |  |  | 17
Impact Of Hedging Instruments [Member] | Cross-currency swaps [member] |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |
Beginning Balance |  | 1,602 | 1,296 |
Financial instruments – purchases |  | (2,145) | 78 |
Change in fair value of financial instruments recognized in OCI |  | 6,922 | (77) |
Amount reclassified from OCI to profit or loss |  | 2,461 | 451 |
Foreign currency revaluation of the net foreign operations |  | (3,588) | (176) |
Effects of changes in foreign exchange rates |  | 92 | 30 |
Ending Balance |  | 5,344 | 1,602 | 1,296
Impact Of Hedging Instruments [Member] | Interest rate swaps [member] |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |
Beginning Balance |  | (20) | 351 |
Change in fair value of financial instruments recognized in OCI |  | (762) | (416) |
Amount reclassified from OCI to profit or loss |  | 129 | 36 |
Effects of changes in foreign exchange rates |  | 14 | 9 |
Ending Balance |  | (639) | (20) | 351
Impact Of Hedging Instruments [Member] | Treasury Lock contracts [Member] |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |
Beginning Balance |  | 71 |  |
Financial instruments – purchases |  |  | 102 |
Amount reclassified from OCI to profit or loss |  | (102) |  |
Tax effect |  | 31 | (31) |
Ending Balance |  |  | 71 |
Impact Of Hedging Instruments [Member] | Commodity price contracts [Member] |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |
Beginning Balance |  | 23 | (136) |
Financial instruments – purchases |  | 351 | 29 |
Change in fair value of financial instruments recognized in OCI |  | 9 | 3 |
Amount reclassified from OCI to profit or loss |  | (37) | 198 |
Effects of changes in foreign exchange rates |  | (8) | 3 |
Tax effect |  | (108) | (74) |
Ending Balance |  | 230 | 23 | (136)
Impact Of Hedging Instruments [Member] | Non-controlling interest [member] |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |
Beginning Balance |  | (537) | (120) |
Financial instruments – purchases |  | (170) | (71) |
Change in fair value of financial instruments recognized in OCI |  | 1,425 | (1,101) |
Amount reclassified from OCI to profit or loss |  | 943 | 631 |
Foreign currency revaluation of the net foreign operations |  | (1,893) | (93) |
Effects of changes in foreign exchange rates |  | 55 | 22 |
Tax effect |  | (106) | 195 |
Ending Balance |  | $ (283) | $ (537) | $ (120)

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