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Investment (Details)
$ in Millions, $ in Millions
Dec. 31, 2020
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Disclosure Of Investments [line items]      
Total investments $ 33 $ 662 $ 12,366
Fixed rate debt [member]      
Disclosure Of Investments [line items]      
Total investments   662 1,052
Variable rate debt [member]      
Disclosure Of Investments [line items]      
Total investments     11,314
Corporate Debt Securities1 [Member] | Fixed rate debt [member]      
Disclosure Of Investments [line items]      
Acquisition cost   658 1,048
Accrued interest   $ 4 4
Corporate Debt Securities1 [Member] | Variable rate debt [member]      
Disclosure Of Investments [line items]      
Acquisition cost     11,307
Accrued interest     $ 7