Notice how, in this article, I've constantly referred to 2007 figures? There's a good reason. In 2007, the Big Three signed a breakthrough contract with the United Auto Workers (UAW) designed, once and for all, to eliminate the compensation gap between domestic and foreign automakers in the U.S.
The agreement sought to do so, first, by creating a private trust for financing future retiree benefits--effectively removing that burden from the companies' books. The auto companies agreed to deposit start-up money in the fund; after that, however, it would be up to the unions to manage the money. And it was widely understood that, given the realities of investment returns and health care economics, over time retiree health benefits would likely become less generous.
In addition, management and labor agreed to change health benefits for all workers, active or retired, so that the coverage looked more like the policies most people have today, complete with co-payments and deductibles. The new UAW agreement also changed the salary structure, by creating a two-tiered wage system. Under this new arrangement, the salary scale for newly hired workers would be lower than the salary scale for existing workers.