$100.00 bills are as high as we go now.
If you want to see picture of billion dollar bills check out Joseph P. Farrell’s classic book on the subject:
https://www.amazon.com/Babylons-Banksters-Alchemy-Physics-Religion/dp/1932595791
This book also has some pictures of this currency:
https://www.amazon.com/Covert-Wars-Breakaway-Civilizations-Celestial/dp/1935487833
The US Treasury claims this currency is fake—but Farrell asks a fascinating question—Why would you counterfeit something that does not exist?