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Taxes - Deferred tax related to OCI (Details) - MXN ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of income taxes [Line Items]        
Deferred tax (liability)/asset, net $ (16,010) $ (13,575) $ (10,657) $ (9,720)
Other comprehensive income [member]        
Disclosure of income taxes [Line Items]        
Deferred tax (liability)/asset, net 33 (596)    
Other comprehensive income [member] | Remeasurements of the net defined benefit liability [member]        
Disclosure of income taxes [Line Items]        
Deferred tax (liability)/asset, net (762) (560)    
Other comprehensive income [member] | Valuation of the effective portion of derivative financial instrument [member]        
Disclosure of income taxes [Line Items]        
Deferred tax (liability)/asset, net $ 795 $ (36)