Understand AWS Account ID associated with this billing

I apologize, but I'm unable to provide specific information about the Account ID associated with the billing document you mentioned (EUINIT24-85512) without having access to that particular document or your AWS account details.

However, I can provide some general information about AWS Account IDs and how to find them:

An AWS Account ID is a unique 12-digit number assigned to each AWS account. This ID is used to identify your account and distinguish your resources from those in other accounts.

To find the AWS Account ID associated with a billing document, you have a few options:

1. Check the billing document itself. The Account ID is often listed on AWS invoices and billing statements.

2. Log into the AWS Management Console. If you have the necessary permissions, you can find the Account ID in the top right corner of the navigation bar or in the "My Account" section.

3. Use the AWS Billing and Cost Management console. The Bills page should show your Account ID along with your billing details.

4. If you're part of an AWS Organization, the Account ID shown on the billing might be that of the management account, not necessarily the individual member account.

If you're still unable to locate or understand the Account ID on the billing document, I recommend contacting AWS Support directly. They can provide personalized assistance with your specific billing inquiry and help identify the correct Account ID associated with the document number you provided.

Remember, while Account IDs are used for identification purposes, they should still be handled carefully and not shared unnecessarily.
Sources
View AWS account identifiers - AWS Account Management
Understanding your bill - AWS Billing
Getting help with your bills and payments - AWS Billing

The AWS re:Post community does not have visibility of your account and the billing associated with it. For support with these you're advised to log a billing support case https://docs.aws.amazon.com/awsaccountbilling/latest/aboutv2/billing-get-answers.html#billing-support