If you have multiple AWS Accounts and are currently paying your AWS Invoice for all those accounts via one account, you are currently using Organizations.
If you have multiple AWS Accounts and are currently paying your AWS Invoice(s) via mulitple accounts, you may have a combination of accounts with and without Organizations. Please reach out to your DoiT contact to setup a review.
If you have only one AWS Account, follow these steps in that account.
After logging in as root user, load this page
If it shows a page like this, you are currently not using Organizations
If it shows a page similar to following, you are using Organizations.
After logging into the payer/management account, load this page. You will see something like the following.
Under Feature Set, it will display one of the following
a) Consolidated Features Only
This means you are not using any Organization-level features. You can skip next step if this is the case.
b) Your organization has all features enabled
This means you could be potentially using some Organziation-level features. Follow next step to find which services are being used
If it shows the following page, you are not currently in the payer account
If your Organization has all features enabled, navigate to this page.
Scroll through the page and take a note of features that has "Access enabled".