The U.S. Federal Reserve's balance sheet expanded slightly as an increase in holdings of mortgage-backed and Treasury securities offset lower discount window borrowing.

The Fed's asset holdings in the week ended Oct. 21 rose to $2.204 trillion, from $2.196 trillion last week, the Fed said in a weekly report released Thursday.

Total discount window borrowing edged lower, to $107.46 billion on Wednesday, from $111.76 billion a week earlier.

Borrowing by commercial banks through the Fed's discount window dipped to $23.56 billion Wednesday, from $27.23 billion a week earlier.

The Fed's portfolio of Treasury securities in the latest week edged higher to $773.48 billion, from $773.46 billion in the previous week.

The Fed's holdings under the Term Asset Backed Securities Loan Facility dropped to $42.26 billion, from $43.05 billion a week earlier.

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