CHICAGO SABMiller Brewing and Molson Coors are merging their domestic operations in a joint venture called MillerCoors. The venture will have combined net revenue of about $6.6 billion and combined beer sales of 69 million barrels in the U.S., according to the companies. The two companies' parents, SABMiller and Molson Coors, will each have a 50 percent voting interest in the new venture. In terms of economic value, SABMiller will have a 58 percent stake, while Molson Coors' interest will be 42 percent. Pete Coors, vice chairman of Molson Coors, will serve as chairman of MillerCoors, while SABMiller CEO Graham Mackay will serve as vice chairman.