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Financial Instruments - Debt (Details) - MXN ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Financial Assets and Financial Liabilities [Line Items]        
Carrying value $ 252,940 $ 246,973 $ 172,630 $ 178,884
Bank loans and notes payables        
Disclosure of Financial Assets and Financial Liabilities [Line Items]        
Carrying value 190,585 188,665    
Fair value $ 198,232 $ 208,134