DETROIT — General Motors Corp. says it may offer current shareholders a reverse stock split that would give them one share of new stock for every 100 shares they currently own. The automaker says in a filing with the Securities and Exchange Commission that the deal would be part of an agreement with the Treasury Department to swap at least half of GM’s debt to the government for company shares.

The filing says both sides are still negotiating the terms of the debt swap, but the government would own at least 50 percent of the company.