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Debt - Summary of Short Term Debt Maturities (Detail)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2019
USD ($)
Disclosure of detailed information about borrowings [line items]      
Short-term debt $ 129,172,033 $ 96,230,634 $ 6,854
Weighted average interest rate 3.31% 5.20%  
Senior Notes 1 [member] | Obligations and senior notes [member]      
Disclosure of detailed information about borrowings [line items]      
Short-term debt $ 88,438,286 $ 67,365,810  
Lines of credit [member]      
Disclosure of detailed information about borrowings [line items]      
Short-term debt 40,722,004 28,852,364  
Finance Lease [member]      
Disclosure of detailed information about borrowings [line items]      
Short-term debt $ 11,743 $ 12,460