Fiat SpA's CEO Sergio Marchionne said that he expected to complete the acquisition of Chrysler Group LLC next year, once the Italian automaker reached a price agreement for the remaining stake in its U.S. unit, the Wall Street Journal reported today. Fiat and a United Auto Workers union retiree trust that owns 41.5 percent of Chrysler disagree on the value of an option that Fiat exercised last July to buy a 3.3 percent stake in Chrysler. Fiat offered the trust, called the Voluntary Employee Beneficiary Association, $139.7 million to buy the stake, and has since proposed paying $198 million for another 3.3 percent stake. But the trust wants about $343 million for the first stake. Marchionne earlier set 2015 as the deadline for completing the acquisition.