Required Detailed report of EMR / EC2 costing.

I must clarify that I'm not part of the AWS Support team and, as such, I don't have access to your account information or the ability to generate detailed reports for you. However, I can guide you on how you can access this information on your own.

You can use AWS Cost Explorer to view and analyze your costs and usage. Here's how to access it:

1. Sign in to the AWS Management Console.
2. Open the AWS Cost Management at https://console.aws.amazon.com/cost-management/home.
3. In the navigation pane, choose Cost Explorer.

In the Cost Explorer, you'll find a set of default reports that you can use to inspect your costs. You can also create custom reports to focus on the costs that matter most to you. You can filter by service, which in your case would be EMR and EC2, and you can view data for up to the last 13 months.

As for reducing costs, there are several strategies you could employ:

1. Right Sizing: Ensure that your EC2 instances and EMR clusters are appropriately sized for your workload. Often, costs can be reduced by downgrading to a smaller instance type if your current instances have consistently low CPU or memory usage.
2. Reserved Instances: If you have a stable and predictable workload, consider purchasing Reserved Instances or Savings Plans to commit to usage in exchange for a discount.
3. Auto Scaling: Use AWS Auto Scaling to adjust your capacity to maintain steady, predictable performance at the lowest possible cost.
4. Delete Unnecessary Resources: Ensure that you terminate unused EC2 instances and EMR clusters when they're no longer needed.
5. Spot Instances: For workloads that can handle interruptions, consider using spot instances, which are significantly cheaper than regular instances.

You can also check out the AWS Cost Management page for more information on controlling your AWS costs.

If you need more personalized assistance, consider reaching out to AWS Support directly.

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Detailed costing can mean many items, it would help if you mentioned your specific requirements here for view. You could use CUR (Cost and Usage Report) or Cost Explorer to get details.

The best way is that you raise an AWS support ticket for your necessary information need as here you will mainly get guidance from experienced folks.