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OTHER LIABILITIES - Movements in the pension benefits (Details) - ARS ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Movements in the pension benefits    
At the beginning of the year $ 376  
Incorporation by merger   $ 485
Service cost 28 36
Interest cost 134 111
Actuarial results (47) (58)
Uses (164) (198)
At the end of the year 327 376
Paid $ (2) $ (12)