Ben Bernanke, Chairman of the U.S. Federal Reserve

Five years after Lehman's failure nearly toppled the financial system, the Federal Reserve is preparing to take a step back from one of the extraordinary programs it launched to save the economy, a move that has been and could continue to be wrenching for markets.

The Federal Reserve is expected to announce its first move to taper its $85 billion in monthly bond buying when its two-day meeting ends Wednesday. While the Fed is seen curbing bond purchases by an initial $10 to $15 billion — a relative baby step compared to the massive amount of stimulus applied — it sends an important message that the Fed is moving toward a normalization of rates and expecting a more normal economy.