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Post-Employment and Other Non-current Employee Benefits - Summary of Changes in Balance of Defined Benefit Obligation for Post-Employment and Other Non-Current Employee Benefits (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of net defined benefit liability (asset) [line items]      
Foreign exchange rate valuation (gain) loss $ (101) $ (78) $ 9
Pension and Retirement Plans | Present Value of Defined Benefit Obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Balance at beginning of year 4,199 4,515 4,311
Current Service Cost 233 246 244
Effect of curtailment (144) (86) 0
Interest expense 346 317 291
Actuarial (gains) or losses (214) (355) 5
Foreign exchange rate valuation (gain) loss (151) (134) 18
Benefits paid (378) (355) (364)
Past service cost 137 47 10
Business acquisitions 0 4 0
Balance at end of year 4,028 4,199 4,515
Seniority premiums | Present Value of Defined Benefit Obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Balance at beginning of year 926 978 865
Current Service Cost 87 94 84
Effect of curtailment (14) (9) 0
Interest expense 88 76 62
Actuarial (gains) or losses 29 (97) 74
Benefits paid (166) (128) (107)
Past service cost 8 6 0
Business acquisitions 0 6 0
Balance at end of year $ 958 $ 926 $ 978