If you choose not to use the JetBrains runtime, you can always substitute a separately downloaded and installed version of JDK, or in your case, follow the instructions to point back to the JetBrains runtime. Windows also includes the where utility which you can invoke from the command line to search for files, just in case you did install a JDK at some point and just can't remember where you put it. Again, because OpenJDK is typically distributed as a ZIP archive, you can literally install it anywhere on your machine, as long as you supply the location of the bin directory to your PATH. You can install OpenJDK anywhere, but usually you're going to find it someplace like c:\Program Files\OpenJDK\\ where refers to whatever version of JDK you chose to install.
Java applications, a standalone JDK is required.
Runtime is bundled with the IDE (based on JRE 17). You do not need to install Java to run IntelliJ IDEA because JetBrains Development of JDK 8 Update Releases is being done in the nearby JDK 8 Updates Project.
Production-ready binary distributions based on the JDK 8 code base are available now from Oracle and will be available soon in most Linux distributions. If you don't recall installing a standalone JDK when you installed JetBrains IDEA, it's probably because you didn't actually do so. JDK 8 reached General Availability on 18 March 2014.
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