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Employee Benefits - Liabilities for Employee Benefits (Details)
$ in Millions, $ in Millions
Dec. 31, 2021
USD ($)
Dec. 31, 2021
MXN ($)
Dec. 31, 2020
MXN ($)
Disclosure of defined benefit plans [line items]      
Total Employee Benefits $ 370 $ 7,600 $ 7,253
Pension and retirement plans      
Disclosure of defined benefit plans [line items]      
Defined benefit obligation   8,015 7,679
Defined benefit obligation funds at fair value   (2,952) (2,788)
Net defined benefit liability   5,063 4,891
Seniority premiums      
Disclosure of defined benefit plans [line items]      
Defined benefit obligation   2,108 1,763
Defined benefit obligation funds at fair value   (133) (137)
Net defined benefit liability   1,975 1,626
Post retirement medical services      
Disclosure of defined benefit plans [line items]      
Defined benefit obligation   647 812
Defined benefit obligation funds at fair value   (85) (76)
Net defined benefit liability   $ 562 $ 736