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Components of Other Comprehensive Loss - Summary of Movement on Components of Other Comprehensive Loss (Detail) $ in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2020 MXN ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($)
Controlling interest: |  |  |  |
Unrealized (loss) gain on equity investments at fair value, net of deferred taxes | $ (1,952,414) | $ (98) | $ 883,408 | $ (3,765,688)
Translation effect of foreign entities | (11,515,297) |  | (35,536,252) | (64,314,032)
Assets revaluation surplus net of deferred taxes | 77,230,031 |  |  |
Total other comprehensive (loss) income items for the year, net of deferred taxes | 53,462,762 | $ 2,678 | (64,188,516) | (67,322,442)
Total equity attributable to equity holders of the parent [member] |  |  |  |
Controlling interest: |  |  |  |
Unrealized (loss) gain on equity investments at fair value, net of deferred taxes | (1,952,414) |  | 883,408 | (3,765,688)
Translation effect of foreign entities | (13,558,774) |  | (34,010,066) | (61,223,458)
Remeasurement of defined benefit plan, net of deferred taxes | (10,026,454) |  | (29,153,554) | 652,722
Assets revaluation surplus net of deferred taxes | 64,835,155 |  |  |
Non-controlling interest of the items above | 14,165,249 |  | (1,908,304) | (2,986,018)
Total other comprehensive (loss) income items for the year, net of deferred taxes | $ 53,462,762 |  | $ (64,188,516) | $ (67,322,442)

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