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Debt, Lease Liabilities and Other Notes Payable - Hedged Items (Details)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
MXN ($)
Disclosure of detailed information about hedged items [line items]            
Notional Amount       $ 122,378,292    
Warrants issued by UHI            
Offset against:            
Foreign exchange (loss) gain derived from the hedge Open Ended Fund $ (1,403,384) $ 125,955        
Open Ended Fund            
Offset against:            
Foreign exchange (loss) gain derived from the hedge Open Ended Fund (289,298) (317,126)        
Designated as hedging instruments            
Disclosure of detailed information about hedged items [line items]            
Notional Amount     $ 2,470.6 46,653,315 $ 2,585.8 $ 50,869,542
Recognized in:            
Comprehensive income 2,030,424 (189,213)        
Total foreign exchange (loss) gain derived from hedging Senior Notes 2,030,424 (189,213)        
Offset against:            
Total foreign currency translation and foreign exchange gain (loss) derived from hedged assets (2,030,424) 189,213        
Designated as hedging instruments | Investment in shares of UHI            
Offset against:            
Foreign exchange (loss) gain derived from the hedge Open Ended Fund (337,742) (1,958)        
Designated as hedging instruments | Warrants issued by UHI            
Disclosure of detailed information about hedged items [line items]            
Notional Amount     1,788.6 33,775,451 1,775.1 34,921,530
Offset against:            
Foreign exchange (loss) gain derived from the hedge Open Ended Fund (1,403,384) (125,955)        
Designated as hedging instruments | Open Ended Fund            
Offset against:            
Foreign exchange (loss) gain derived from the hedge Open Ended Fund $ (289,298) $ 317,126        
Designated as hedging instruments | Net investment | Investment in shares of UHI            
Disclosure of detailed information about hedged items [line items]            
Notional Amount     433.7 8,189,662 421.2 8,285,286
Designated as hedging instruments | Fair value hedge of foreign currency | Open Ended Fund            
Disclosure of detailed information about hedged items [line items]            
Notional Amount     $ 248.3 $ 4,688,202 $ 389.5 $ 7,662,726