Michigan Department of Treasury, Lansing, made two commitments to venture capital funds that invest in Internet companies. The department, with close to $49 billion in pension assets, committed $125 million to Softbank Technology Ventures IV and V, said Bridget Medina, a spokeswoman. It also committed $30 million to idealab Capital Partners. Funding will come from Michigans cash position, she said. Michigan Department of Treasury has an 8.5% exposure to private equity, she said.