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Employee Benefits - Rollforward, Balance of the Defined Benefit Obligation (Details) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost $ 766 $ 729 $ 549
Pension and retirement plans      
Disclosure of net defined benefit liability (asset) [line items]      
Initial balance 7,679    
Ending balance 8,015 7,679  
Pension and retirement plans | Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Initial balance 7,679 7,193 6,189
Current service cost 390 372 279
Past service (credit) cost (3) 73 (45)
Interest expense 527 506 530
Settlement / Curtailment     2
Remeasurements of the net defined benefit obligation (42) 326 859
Foreign exchange loss (gain) 28 37 (69)
Benefits paid (564) (828) (582)
(Derecognition) acquisitions     30
Ending balance 8,015 7,679 7,193
Seniority premiums. | Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Initial balance 1,763 1,237 772
Current service cost 290 239 139
Past service (credit) cost 836   161
Interest expense 124 101 68
Settlement / Curtailment (839) 13  
Remeasurements of the net defined benefit obligation 112 309 230
Benefits paid (178) (136) (133)
Ending balance 2,108 1,763 1,237
Post retirement medical services      
Disclosure of net defined benefit liability (asset) [line items]      
Initial balance 812    
Ending balance 647 812  
Post retirement medical services | Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Initial balance 812 797 418
Current service cost 44 44 15
Past service (credit) cost 236    
Interest expense 57 61 38
Settlement / Curtailment (271)    
Remeasurements of the net defined benefit obligation (191) (59) 356
Benefits paid (40) (31) (30)
Ending balance $ 647 $ 812 $ 797