
Craig Y. answered 06/10/19
Personable Sr VP, CPA for Acctg, Finance, Business, Excel Tutoring
The confusion lies in the fact that the word "note" has multiple meanings even just within the context of finance. You are thinking of its meaning as a shortened reference to a "Federal Reserve Note", which is also called a bill, as in a 20 dollar bill.
To someone working in finance or accounting, the mention of a note typically means a type of debt, as in a promissory note which is a liability, or "Note Payable", on the Balance Sheet. An example of that is the Treasury Dept. of the U.S. Government borrowing money called Treasury Notes, or T-Notes for short. Those are liabilities that comprise a significant portion of the U.S. federal debt..