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Financial Instruments by Category - Summary of Company's Financial Assets Measured at Fair Value (Detail) - ARS ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]      
Financial Assets $ 44,468 $ 15,408 $ 18,733
Investment in financial assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial Assets 9,882 8,370 10,941
Cash and cash equivalents [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial Assets 34,586 7,038 7,792
Public securities [member] | Investment in financial assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial Assets 9,882 8,370 10,941
Mutual funds [member] | Cash and cash equivalents [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial Assets 34,586 7,038 7,792
Level 1 [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial Assets 44,468 15,408 18,733
Level 1 [member] | Investment in financial assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial Assets 9,882 8,370 10,941
Level 1 [member] | Cash and cash equivalents [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial Assets 34,586 7,038 7,792
Level 1 [member] | Public securities [member] | Investment in financial assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial Assets 9,882 8,370 10,941
Level 1 [member] | Mutual funds [member] | Cash and cash equivalents [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial Assets $ 34,586 $ 7,038 $ 7,792