Scenario:
The Expense Detail Report consolidates expenses based on the Incurred Date and Expense Type. If the Expense Type and Incurred Date for 2 expense entries are the same, the expenses will consolidated. The only way the report can give you a break-up of the expenses is by entering comments in the Description field on the expense sheet and by enabling Expense Detail Description field in the Expense Detail Report. When you run this report after enabling this field, the report will look at the information in the Description field as well and provide you with the break-up of the expense incurred even if the expense type is same.

Note:
If you would like to run the Detailed(Expense-User) report, you have to enable the “Expense Line Description” field in the report settings.