General Motors ( GM) plans to raise $10 billion through the sale of bonds and convertible securities, the company said. The shares fell 8 cents, or 0.2%, to $38.15 on the Instinet premarket session after the news was released. The automaker will use proceeds to fund its pension plan and other retiree benefits. The plans are currently showing a deficit of close to $20 billion. GM's finance unit also filed to raise an additional $3 billion in debt.