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Financial Instruments (Schedule of Book Value of Assets and liabilities Denominated in Foreign Currency) (Details)
$ in Thousands, $ in Thousands
Dec. 31, 2019
USD ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
MXN ($)
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Short - term assets   $ 22,410,136   $ 26,100,965
Short - term liabilities   7,286,477   8,992,168
Currency risk [Member]        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Short - term assets   11,176,625   11,649,108
Short - term liabilities   4,843,976   5,567,083
Net monetary asset position in foreign currency   $ 6,332,649   $ 6,082,025
Currency risk [Member] | USD [Member]        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Net monetary asset position in foreign currency $ 335,545   $ 309,414