Google must sell its Chrome browser to restore competition in the online search market, US prosecutors have argued.
The proposed separation was outlined in a 23-page document filed by the U.S. Department of Justice.
It also calls on lawmakers to impose restrictions intended to prevent its Android smartphone software from favoring its own search engine.
If the rules were introduced it would essentially result in Google being highly regulated for 10 years.
Google controls around 90% of the online search market and 95% on smartphones.
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Court documents filed Wednesday expand on an earlier look at what prosecutors say would dilute that monopoly.
Google called the proposals radical, saying they would harm American consumers and businesses and undermine American competitiveness in AI.
The company said it would appeal.
The U.S. Department of Justice (DoJ) and a coalition of states want U.S. District Judge Amit Mehta to end exclusive deals in which Google pays billions of dollars each year to Apple and other device suppliers so that they are the default search engine on their tablets and smartphones.
Google will have the opportunity to present its own proposals in December.
A trial on the proposals has been scheduled for April, but President-elect Donald Trump and the DoJ’s next antitrust chief could intervene.