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Right of use assets and lease debt - Schedule of maturity of lease liabilities (Detail)
$ in Thousands, $ in Millions
Dec. 31, 2019
MXN ($)
Dec. 31, 2019
USD ($)
Jan. 01, 2019
MXN ($)
Disclosure of maturity analysis of operating lease payments [line items]      
Short term $ 25,894,711 $ 1,374  
Long term 94,702,022 $ 5,025  
Total 120,596,733   $ 119,387,660
Maturity analysis 120,596,733    
Within one year [member]      
Disclosure of maturity analysis of operating lease payments [line items]      
Maturity analysis 25,894,711    
After one year but not more than five years [member]      
Disclosure of maturity analysis of operating lease payments [line items]      
Maturity analysis 80,981,832    
More than five years [member]      
Disclosure of maturity analysis of operating lease payments [line items]      
Maturity analysis $ 13,720,190