The central bank's Federal Open Market Committee said in a statement it will reduce mortgage-backed asset purchases by $5 billion to $35 billion per month and drop its Treasury securities purchases from $45 billion per month to $40 billion, due to "growing underlying strength in the broader economy."
"In light of the cumulative progress toward maximum employment and the improvement in the outlook for labor market conditions, the Committee decided to modestly reduce the pace of its asset purchases," the statement said.
The Fed said the economy is expanding "at a moderate pace ... [and] labor market conditions have shown further improvement" even though the unemployment rate remains "elevated."
"The [Open Market] Committee sees the risks to the outlook for the economy and labor market as having become more nearly balanced," the Fed said in a statement.
The Fed said the federal funds rate would remain at zero to 0.25 percent and changed its guidance on the rate, saying it would remain at that rate "at least as long as the unemployment rate remains above 6.5 percent."
Fed Chairman Ben Bernanke told reporters at a news conference he expects the federal funds rate will remain low even beyond the point when the unemployment rate reaches 6.5 percent.
"The recovery is far from complete," he said, adding that the Fed's committee members were "disappointed in the pace of growth."
Bernanke noted that the employment situation included a troubling "decline in labor force participation."
The Fed, he said, projected the gross domestic product will climb to about 3.8 percent in 2014, with unemployment dropping to between 6.3 percent and 6.6 percent in the fourth quarter of 2014, and to between 5.3 percent and 5.8 percent by the final quarter of 2015.
Inflation is expected to remain muted, Bernanke said.