QB Issue Resolution:

reports

in the search box top left, type aging and select the detail report you want a/p or a/r

Resolution for Issue 'How can I get an A/R Aging DETAIL report, not just the summary?' available: Yes (Solved).
Source: Intuit Community forum.

How can I get an A/R Aging DETAIL report, not just the summary?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for aging
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Error Recovery for aging [Canada]
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