The State of Illinois is authorized to issue, sell and provide for the retirement of limited obligation bonds, notes and other evidences of indebtedness of the State of Illinois in the total principal amount of $11,358,681,100 herein called "Bonds". Such amount of authorized Bonds shall be exclusive of any refunding Bonds issued pursuant to Section 15 of this Act and exclusive of any Bonds issued pursuant to this Section which are redeemed, purchased, advance refunded, or defeased in accordance with paragraph (f) of Section 4 of this Act. Bonds shall be issued for the categories and specific purposes expressed in Section 4 of this Act.
30 ILCS 425/2