WASHINGTON (AP) — The Federal Reserve unleashed a series of bold and open-ended steps Thursday designed to stimulate the economy by boosting the stock market and making it cheaper for people to borrow and spend.

The Fed said it will spend $40 billion a month to buy mortgage bonds for as long as it deems necessary to make home buying more affordable. It plans to keep short-term interest rates at record lows through mid-2015 — six months longer than previously planned. And it's ready to try other stimulative measures if hiring doesn't pick up.

"The idea is to quicken the recovery," Chairman Ben Bernanke said at a news conference. But Bernanke made clear that he thinks the economy will need the Fed's help even after the recovery strengthens.