WASHINGTON — Detroit’s automakers, making a second bid for $25 billion in funding, are presenting Congress with plans Tuesday to restructure their ailing companies and provide assurances that the funding will help them survive and thrive.

General Motors Corp., Ford Motor Co., and Chrysler LLC would refinance their companies’ debt, cut executive pay, seek concessions from workers and find other ways of reviving their staggering companies.

UAW leaders, meanwhile, summoned local union leaders from across the country to an emergency meeting Wednesday in Detroit to discuss concessions the union could make to help auto companies get government loans.

U.S. automakers are struggling to stay afloat heading into 2009 under the weight of an economic meltdown, the worst auto sales in decades and a tight credit market. General Motors, Ford and Chrysler went through nearly $18 billion in cash reserves during the last quarter, and GM and Chrysler have said they could collapse in weeks.

Top executives from the Big Three failed last month to convince a skeptical Congress that they were worthy of $25 billion in loans. House Speaker Nancy Pelosi, D-Calif., and Senate Majority Leader Harry Reid, D-Nev., ordered them to outline major changes, including the elimination of lavish executive pay packages and assurances that taxpayers would be reimbursed for the loans.

All three companies are filing separate plans. Congressional hearings are planned for Thursday and Friday.

“I believe the industry will make a compelling case for bridge loans that will allow the companies to return to firm financial footing,” said Sen. Carl Levin, D-Mich.

GM will outline efforts to negotiate swapping some of the company’s debt for equity stakes in the automaker, either shares or warrants for them, said two people briefed on the company’s plan.

With eight separate brands, GM will also discuss efforts to shed brands but it would prefer to sell them instead of shutting down Pontiac, Saturn or Saab, said one of the people briefed on the plan. Killing off brands, like GM did with Oldsmobile in 2004, would require cash the company doesn’t have, the person said. The people briefed on GM’s preparations didn’t want to be identified because the plan hadn’t been completed.

Some members of Congress have urged the Big Three executives to take major pay cuts as part of the deal. Chrysler Chief Executive Robert Nardelli said he would work for $1 a year, and a similar commitment is expected from GM CEO Rick Wagoner. Ford plans to include a pay cut for Ford CEO Alan Mulally, although the size of the cut was not immediately available.

Chrysler is expected to outline changes that would include a swap of debt in the company for equity stakes and reductions in some vehicle models, according to a person who was briefed on the plan. The person spoke on condition of anonymity because the discussions were private.

Ford, meanwhile, is not expected to immediately seek the loans. Mulally told Congress last month that the company would only seek funding if the U.S. market continued to deteriorate. He mortgaged factories to arrange a $23.4 billion credit line shortly after taking over the company in 2006 and he has said Ford can last at least until 2010.

Cash stockpiles at GM and Chrysler are dangerously close to the minimum amount required to run the companies, meaning they could have trouble paying all their bills by the end of the year.

GM, according to its quarterly report filed with the Securities and Exchange Commission, owes creditors $45 billion and it must pay more than $7.5 billion early in 2010 to a United Auto Workers trust fund that will take over retiree health care payments.

Ford owes more than $26 billion, with $6.3 billion due to its UAW trust fund at the end of 2009. Chrysler, a private company, does not have to open its books, but its CEO, Nardelli, has said it would be difficult for the company to make it without federal aid. All three likely are negotiating with the UAW for delays in payments to the trusts.