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Financial Assets and Liabilities - Summary of changes in liabilities arising from financing activities (Detail) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance $ 737,710,197 $ 744,851,210
Cash flow (88,899,031) (82,715,366)
Foreign currency exchange and other 13,873,161 75,574,353
Ending balance 662,684,327 737,710,197
Debt [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 628,382,956 624,254,477
Cash flow (58,354,281) (53,091,801)
Foreign currency exchange and other (5,998,573) 57,220,280
Ending balance 564,030,102 628,382,956
Liability Related to Right of Use of Assets [Member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 109,327,241 120,596,733
Cash flow (30,544,750) (29,623,565)
Foreign currency exchange and other 19,871,734 18,354,073
Ending balance $ 98,654,225 $ 109,327,241