Citing a need to trim costs,Kraft Foods Inc., Northfield, Ill., said it soon expects to eliminate 400 jobs, or about 1 percent of its 46,000-employee North American workforce. Officials said the cuts will primarily affect divisional office employees. Four Kraft divisions -- cheese, pizza, grocery and foodservice -- are located at the company's Chicago-area headquarters. The Oscar Mayer meats division is based in Madison, Wis., and Kraft's Canadian business is located in Toronto.