By Christina Rogers 

The United Auto Workers is looking to create one large health insurance pool for workers at Detroit's Big Three auto makers, a move aimed at helping the companies better leverage their size to win cost savings from medical providers.

UAW President Dennis Williams said Thursday he aims to bring the proposal to the bargaining table next month when the union starts negotiations for a new four-year contract with Ford Motor Co., General Motors Co. and FCA US LLC, the U.S. unit of Fiat Chrysler Automobiles NV. He said the insurance pool could include active hourly workers, as well as salaried employees and hourly retirees, a group that would combined have more than 1 million members.

Currently, GM, FCA US and Ford each have separate health plans for their blue-collar factory workers. Benefits for more than 600,000 retired hourly workers are managed and paid for by a UAW-run trust that was established in 2007 and is now one of the nation's largest private health-care providers. Mr. Williams declined to offer specifics on the proposal, only to say that this is "the focus right now."

"The more people pooled together in this health care system, the more leverage you have with institutions, such as hospitals, clinics and insurance companies," Mr. Williams said. "I would love to create a pool to insure members across companies."

Health care promises to be a priority for the both the union and the Detroit car makers as they work to replace a four-year agreement that expires Sept. 14. Today, auto workers have some of the richest health-care benefits in the country; and while UAW members have had to make other concessions during the industry's darkest days, their medical plans have remained largely intact.

The UAW could find support at the auto makers, who are each exploring similar arrangements. Combined, Ford, GM and FCA US will spend more than $2 billion in medical costs for its hourly workers in 2015, or about $14,800 per worker.

Negotiators at the Detroit car makers have said they are willing to be creative in lowering expenses, which they view as rising steeply over the course of the agreement due in part to a new federal tax scheduled to take effect in 2018 on the benefit-rich plans now offered to workers.

The effort could include forming a shared private exchange that would allow companies to use their combined scale to push for better costs and potentially negotiate with hospitals, doctors and other health providers directly, according to people familiar with the matter.

UAW members pay between 6% and 8% of their medical costs--far less than what is typical for manufacturing employees. Fiat Chrysler estimates it is conceivable hourly worker medical costs will eventually exceed the equivalent of $16 an hour, or more than the entry-level wage, if they go unchecked.

FCA US said, in a statement, "as the cost of health care continues to increase at an unsustainable rate, FCA US is open to discussing with the UAW options that will reduce cost while both improving the quality of care and the health of our employees."

Ford and GM declined to comment directly on the UAW's proposal. GM said it is "always open to talking through creative solutions" on employee benefits.

Write to Christina Rogers at christina.rogers@wsj.com

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