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Financial Assets and Liabilities - Additional Information (Detail) - Level 2 [member] - MXN ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]    
Net realized gains (losses) related to derivative financial instruments $ 2,606,938,000 $ (1,774,932,000)
Transfers out of Level 1 into Level 2 of fair value hierarchy $ 0 $ 0