Something doesn't look right here... GM has 324,000 employees... so this works out to be almost $17,000/year/employee in Health Care costs.
I work at a manufacturing company... we are working to drive down our health care costs at our division because we are WELL ABOVE the national average in heath care cost/employee at around $7,000/employee. National average IIRC is around $4,500/employee.
The coming health care crisis is going to hit more than just the uninsured, the poorly-run companies are going to see problems first. In five or ten years, the rest of the system goes into full collapse.
That number includes retiree benefits, which is what's really killing GM.
The health care cost figure includes living retirees so your arithmetic is faulty.