Charge of Tax under GST in Invoice?

My query is in regard to charging of tax in Intrastate supply of goods. For example the rate of Gst tax is 12%, then is that so the invoice generated will have a birfurcation of 6% SGST and 6% CGST or the same would have a birfurcation as 12% SGST and 12% CGST? Also what if the goods are sold to other state where the element of IGST arise. What would be the tax bifurcation in the invoice for same taxable goods for interstate transaction?