NEW YORK (AP) — Billionaires Michael and Susan Dell pledged $6.25 billion Tuesday to provide 25 million American children under 10 an incentive to claim the new investment accounts for children created as part of President Donald Trump’s tax and spending legislation.

The historic gift has little precedent, with few single charitable commitments in the past 25 years exceeding $1 billion, much less multiple billions. Announced on GivingTuesday, the Dells believe it’s the largest single private commitment made to U.S. children.