Swiss commodities giant Glencore is negotiating to sell a stake in its vast agricultural business to the Canada Pension Plan Investment Board, the Wall Street Journal said Tuesday. CPPIB is reportedly willing to pay as much as US $2.4 billion for a 40 percent stake in the business, with the proceeds going to pay down Glencore''s massive debt. A deal could be announced this week, the newspaper said, citing sources close to the deal. Neither the company nor the pension fund would comment on the report.