Is there a way to break down the EC2-Other category?

Part of the original question was around costs per Resource. EC2 instance cost can include Resource ID in Cost Explorer, but there is a fee to include this and I don't believe this will show you the EC2-Other costs per resource. Cost and Usage Reports [1] can show you EBS costs per Volume ID. But you would need to know which EC2 instances have which volumes, which you can find via the AWS CLI [2]. I am not aware of a way in the billing system to allocate EBS volumes to EC2 resources unless you used Tagging on the EBS volumes [3]. Don't forget to Cost Allocate those Tags so they show up in the billing systems [4].

[1] https://docs.aws.amazon.com/cur/latest/userguide/what-is-cur.html [2] https://docs.aws.amazon.com/cli/latest/reference/ec2/describe-instances.html [3] https://aws.amazon.com/blogs/aws/new-tag-ec2-instances-ebs-volumes-on-creation/ [4] https://docs.aws.amazon.com/awsaccountbilling/latest/aboutv2/cost-alloc-tags.html

Thanks for the tips. Exactly I was looking for.