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Significant Accounting Policies - Summary of Revenue from Contracts with Customers (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers $ 183,985 $ 194,471 $ 182,342
Sale of products      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 181,890 192,342 181,823
Services rendered      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 327 385 330
Other Operating Revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers $ 1,768 $ 1,744 $ 189