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Significant Accounting Policies - Summary of Estimated Range of Opening Statement of Financial Position Effects (Detail)
$ in Millions, $ in Millions
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Jan. 01, 2017
USD ($)
Disclosure of changes in financial position [line items]      
Financial liabilities $ 317,210 $ 340,455  
Retained earnings $ 20,992 $ 6,179  
Bottom of range [member] | Increase (decrease) due to application of IFRS 16 [member]      
Disclosure of changes in financial position [line items]      
Assets for the right-of-use     $ 920
Financial liabilities     (1,030)
Retained earnings     (110)
Top of range [member] | Increase (decrease) due to application of IFRS 16 [member]      
Disclosure of changes in financial position [line items]      
Assets for the right-of-use     942
Financial liabilities     (1,060)
Retained earnings     $ (118)