The local currency in Indonesia is called rupiah. Notes commonly used is 500, 1.000, 5.000, 10.000, 20.000, 50.000 and 100.000 Rupiah. Coin values are 50, 100, 500 and 1.000 rupiah. It is not allowed to bring more than 50.000Rp out of the country. One of the small everyday problems you will encounter is to have enough of the smaller values. Most people are not able to change a 50.000 or a 100.000 rupiah note, or that is anyway what they will tell you.