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Employee benefits (Details 2) - ARS ($)
$ in Millions
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Disclosure of defined benefit plans [line items]      
Total present value of defined benefits obligations (post-employment) $ 687 $ 2,462 $ 1,642
Fair value of plan assets (592) (1,703) (1,101)
Recognized liability for defined benefits obligations 95 759 541
Liability for other long-term benefits 15 4 148
Total recognized liabilities 110 763 689
Assets designed for payment of benefits for employees (4)
Net position from employee benefits 110 763 685
Unfunded Plan [Member]      
Disclosure of defined benefit plans [line items]      
Total present value of defined benefits obligations (post-employment) 316 673 572
Funded Plan [Member]      
Disclosure of defined benefit plans [line items]      
Total present value of defined benefits obligations (post-employment) $ 371 $ 1,789 $ 1,070