NTT Corp.'s unit agreed to buy technology services businesses from Dell for $3.055 billion.

The acquisition would be NTT Data Corp.'s largest, helping increase its sales outside Japan, where a shrinking and aging population has stymied economic growth.

Dell, which paid $3.9 billion for what was formerly known as Perot Services in 2009, is selling some assets before completing a record deal — the $67 billion takeover of software and storage systems provider EMC Corp.

Dell plans to sell the division as part of a wider effort to raise as much as $10 billion from the disposal of assets that aren't core to its business, the Re/code website had reported earlier.

NTT Data has spent more than ¥72 billion ($634 million) buying companies since 2011, about ¥62 billion of it outside Japan, according to data compiled by Bloomberg. Overseas sales had risen to ¥450 billion by the year ended March 31, 2015, compared with more than ¥208 billion in the 12 months to March 2012.

Global rivals of NTT Data including Cognizant Technology Solutions Corp., Tata Consultancy Services Ltd. and Atos SE had also previously participated in an auction for Perot Systems that failed to generate a deal, according to the Nikkei, Reuters and re/code, which all cited people familiar with the matter.