WILLIAMS COS <WMB> COMPLETES SALE OF UNIT Williams Cos said it completed the sale of its Agrico Chemical Co unit to Freeport-McMoRan Resource Partners L.P. <FRP> for an initial 250 mln dlrs cash. The company said it will also receive an additional 100 to 250 mln dlrs in five years based on the operating performance of the unit. It said the cash proceeds will be used to lower its debt costs.