The United Auto Workers union would eventually own 55% of the stock in a restructured Chrysler LLC under the deal reached by the union and the auto maker, according to a summary of the agreement that was reviewed by the Wall Street Journal.

Fiat SpA "eventually" will own 35%, and the U.S. government and Chrysler's secured lenders together will end up owning 10% of the company once it is reorganized, that summary said.

The...