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Employee Benefits - Roll forward, Remeasurements of Employee Benefit Plans (Details) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of net defined benefit liability (asset) [line items]      
Amount accumulated in other comprehensive income as of the beginning of the period, net of tax $ 6,920    
Amount accumulated in other comprehensive income as of the end of the period, net of tax 8,760 $ 6,920  
Net benefit cost recognized in consolidated statements of accumulated other comprehensive income      
Disclosure of net defined benefit liability (asset) [line items]      
Amount accumulated in other comprehensive income as of the beginning of the period, net of tax 923 1,661 $ 2,078
Actuarial (gains) losses arising from exchange rates 190 (100) (77)
Remeasurements during the year, net of tax 931 314 211
Actuarial (gains) and losses arising from changes in financial assumptions 957 223 (1,848)
Actuarial (gains) and losses arising from changes in demographic assumptions 1 (4) (71)
Business Acquisitions     336
Return on plan assets (752) (92) 713
Changes in the effect of limiting a net defined benefit asset to the asset ceiling (286) (546) 319
Effect on settlement 0 (533) 0
Amount accumulated in other comprehensive income as of the end of the period, net of tax $ 1,964 $ 923 $ 1,661