I appreciate the screenshot you provided, TessaT3773.

Let me continue to help you see the actual category splits of bills on your Transaction Detail by Account report.

Here's how:

1. Go to Reports and find Transaction Detail by Account.
2. Click the Customize button.
3. Under the Filter drop-down, check the box for Transaction Type and select Bill.
4. Check the box for Distribution Account and choose Accounts Payable (AP).
   
5. Click Run report.

This will show the category details of the split transactions. 

Also, you can access all your pre-existing reports available within QBO through the help of these articles. This will help you know more about managing a wide range of reports in QBO without posting a question to the support page:
 

• How to Customize Reports: Basics, Sorting & Date Ranges
• Run reports in QuickBooks Online
• Memorize reports in QuickBooks Online

To help you with future tasks and tips when using QBO, you might want to visit our Help Articles.

The Community is always open if you have other questions managing transaction reports. I'll be around to help. Wishing you a great day ahead!