Transimpedence amplifier, higher output than expected
The output voltage is negative because of the direction of the input current and since you supply your opamp with +- 15 Volt it cant drive its output beyond that. In fact since it is not a rail to rail opamp there is a certain voltage the output stays below/above the rails. In fact the opamp is in saturation. Try feeding your circuit with a lower Input current e.g. 1mA.