WASHINGTON -- The federal government is working on a sweeping series of programs that would represent perhaps the biggest intervention in financial markets since the 1930s, embracing the need for a comprehensive approach to the financial crisis after a series of ad hoc rescues.

At the center of the potential plan is a mechanism that would take bad assets off the balance sheets of financial companies, said people familiar with the matter, a device that echoes similar moves taken in past financial crises. The size of the entity...