English speaking Dopers: "Banknotes" or "Bills"?

I dunno. I call the $100 note a “Baron Von Greenback” because of the guy on the front.

http://www.rba.gov.au/CurrencyNotes/NotesInCirculation/hundred_dollar.html

Or, rather, the back, as that site helpfully pointed out to me after I’d already gone and posted the message.