General Motors will make a $1 billion investment in its factories that will create or keep around 1,500 jobs. The investment is part of the normal process of equipping factories to build new models, and it's been planned for months. The Detroit automaker also said Tuesday that it will begin work on insourcing axle production for its next generation full-size pickup trucks, including work previously done in Mexico, to operations in Michigan, creating 450 U.S. jobs. The company also confirmed that a supplier will make components for GM's next-generation full size pick-up trucks in Michigan, moving 100 supplier jobs from Mexico to the U.S.