Alphabet Inc.’s Chrome browser could go for as much as $20 billion if a judge agrees to a Justice Department proposal to sell the business, in what would be a historic crackdown on one of the world’s biggest tech companies. The department will ask the judge, who ruled in August that Google illegally monopolised the search market, to require measures related to artificial intelligence and its Android smartphone operating system, according to people familiar with the plans. Antitrust officials, along with states that have joined the case, also plan to recommend Wednesday that federal judge Amit Mehta impose data licensing requirements, said the people, who asked not to be named discussing a confidential matter.