XML transformation using XSLT

I have a current XML file as shown below.

<INVOICES>
  <INVOICE>
    <HEADER>
        <DocumentID>001500113139_1260538</DocumentID>
        <DocumentID>001500113138_1262778</DocumentID>
        <DocumentID>001500113137_1262762</DocumentID>
        <DocumentID>001500113136_1260522</DocumentID>               
    </HEADER>
  </INVOICE>
</INVOICES>

This has to be transformed to the below format using XSLT.

<Batches>
    <Batch ID="20141119">
      <Documents>
        <Document ID= 001500113139_1260538 />
        <Document ID= 001500113138_1262778 />
        <Document ID= 001500113137_1262762 />
        <Document ID= 001500113136_1260522 />
      </Documents>
    </Batch>
</Batches>

How to map the Xml elements to attributes. Could anyone suggest please.

Thanks in advance.