The Treasury Department will propose on Monday that Congress give the Federal Reserve broad new authority to oversee financial market stability, in effect allowing it to send SWAT teams into any corner of the industry or any institution that might pose a risk to the overall system.

The proposal is part of a sweeping blueprint to overhaul the nation’s hodgepodge of financial regulatory agencies, which many experts say failed to recognize rampant excesses in mortgage lending until after they set off what is now the worst financial calamity in decades.