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Bank loans: (Details 1)
$ in Millions
Dec. 31, 2018
COP ($)
Borrowings $ 440
Bancolombia S A [Member]  
Borrowings 150
Corpbanca Colombia S A [Member]  
Borrowings 102
Banco Davivienda S A [Member]  
Borrowings 90
Banco de Bogota S A [Member]  
Borrowings 37
Banco de Occidente S A [Member]  
Borrowings 37
Banco Popular S A [Member]  
Borrowings 8
Banco AV Villas S A [Member]  
Borrowings 8
Servicios Financieros S A [Member]  
Borrowings $ 8