Source: Board of Governors of the Federal Reserve System (US)  

Release: H.4.1 Factors Affecting Reserve Balances  

Units:  Millions of U.S. Dollars, Not Seasonally Adjusted

Frequency:  Weekly, As of Wednesday

These data are amounts that are eliminated when consolidating the balance sheets of the 12 Reserve Banks into a single balance sheet. Cash items in transit between Reserve Banks (or Reserve Bank branches) are eliminated from "Items in Process of Collection" and from "Deferred Availability Cash Items" to avoid double counting.