The term GM __ can be completed with the four letter word 'Corp'. GM Corp is a multinational corporation that has been in business since 1908. It is headquartered in Detroit, Michigan and is one of the world's largest automakers. GM Corp produces cars, trucks, and SUVs under various brands such as Chevrolet, Buick, Cadillac, and GMC. The company also provides financial services and sells parts and accessories. GM Corp has operations in over 150 countries and employs over 180, 000 people worldwide.