DETROIT -- General Motors Corp. reported a $38.7 billion loss for 2007 on Tuesday, the largest annual loss ever for an automotive company, and said it is making a new round of buyout offers to U.S. hourly workers in hopes of replacing some of them with lower-paid help.

The earnings report and buyout offer came as GM struggles to turn around its North American business as the economy weakens.

But GM Chairman and Chief Executive Rick Wagoner said that the company made significant progress in 2007, reducing structural costs in North America, negotiating a historic labor agreement and growing aggressively in Latin America and Asia.

During a conference call with analysts and media, Chief Financial Officer Fritz Henderson said 2008 will be difficult, but the company sees the potential for significant earnings increases by 2010 or 2011 once it reduces its work force and labor costs and transfers its retiree health-care costs to a new UAW-run trust.

The Detroit-based automaker said it was offering a new round of buyouts to all 74,000 of its U.S. hourly workers who are represented by the United Auto Workers.

GM won't say how many workers it hopes to shed, but under its new contract with the UAW, it will be able to replace up to 16,000 workers doing non-assembly jobs with new employees who will be paid half the old wage of $28 per hour.

Ford Motor Co. and Chrysler LLC already have announced similar buyout offers.