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Employee Benefits - Rollforward, Balance of the Defined Benefit Obligation (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]      
Non-cash movements in post-employment and other non-current employee benefits obligations $ 1,052 $ 910 $ 854
Pension and Retirement Plans | Defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Initial balance 15,366 15,113 8,015
Non-cash movements in post-employment and other non-current employee benefits obligations 505 489 534
Past service cost 239 288 163
Interest expense 815 820 687
Gain on settlement (254) (243) (280)
Remeasurements of the net defined benefit obligation 708 531 (2,073)
Foreign exchange (gain) or loss 1,793 (48) (79)
Benefits paid (1,430) (1,504) (1,146)
Business acquisitions 0 0 9,189
Employees contributions 105 119 103
Local plans 19    
Plan amendments   (4)  
Ending balance 17,866 15,366 15,113
Pension and Retirement Plans | Defined benefit obligation | Discontinued operations      
Disclosure of net defined benefit liability (asset) [line items]      
Discontinued operations   (195)  
Post-Retirement Medical Services | Defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Initial balance 554 556 647
Non-cash movements in post-employment and other non-current employee benefits obligations 30 32 32
Past service cost 36 13 26
Interest expense 57 54 52
Gain on settlement (25) (14) (29)
Remeasurements of the net defined benefit obligation (27) 5 (136)
Benefits paid (31) (43) (36)
Discontinued operations 0 (49) 0
Ending balance 594 554 556
Seniority Premiums | Defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Initial balance 2,181 2,068 2,108
Non-cash movements in post-employment and other non-current employee benefits obligations 394 345 328
Past service cost 89 21 7
Interest expense 212 191 160
Gain on settlement (27) (21) (13)
Remeasurements of the net defined benefit obligation 324 66 (342)
Benefits paid (201) (254) (180)
Ending balance 2,972 2,181 2,068
Seniority Premiums | Defined benefit obligation | Discontinued operations      
Disclosure of net defined benefit liability (asset) [line items]      
Discontinued operations $ 0 $ (235) $ 0