The lower rate of bond purchases will take effect in April, the Fed's monetary policy committee said in a statement after concluding a regular meeting in Washington.
The Fed maintained its benchmark interest rates at the unprecedented, near-zero level held since December 2008.
"Much remains to be done on both the jobs and inflation fronts," Fed Chairwoman Janet Yellen said after the meeting, in her first press conference since taking the helm of the board on February 1.
DPA