GM is feeling good about the economy and its prospects. Case in point: The automaker today announced that it plans to invest $2 billion in its U.S. assembly and component plants.The dollars will create or keep more than 4,000 jobs at 17 facilities in eight states, according to the automaker. "We are doing this because we are confident about demand for our vehicles and the economy," GM Chairman and CEO Dan Akerson said during an event at the 54-year-old Toledo (Ohio) Transmission Plant. "This new investment is on top of $3.4 billion and more than 9,000 jobs that GM has added or saved since mid-2009." Akerson said GM will invest $204 million in the Toledo facility for an advanced eight-speed automatic transmission for future vehicles, retaining approximately 250 jobs.