The Fed & mortgage-backed securities question

[Neil Hohmann]

Hello,

I just read an article today in the New York Times about the Federal Reserve and inflation (https://www.nytimes.com/2017/10/11/business/econom... ). In it, it mentions that the Fed started reducing its holdings of mortgage-backed securities in September by about $10 billion/month.

Does this mean Fannie Mae is now dumping $10 billion worth of notes (mortgages) into the secondary market to be bought and sold by banks, mutual funds, and note investors? If so, is this a larger amount then usual or fairly typical? And is this a buying opportunity individual note investors are seeing now or will be in the near future? 

Thank you for your thoughts.

Neil