Japan's government said on Friday that profits from a $550 billion investment package agreed in this week's tariff deal with the U.S. would be split between Japan and the U.S. according to the degree of contributions by each side.

The US and Japan this week reached what President Donald Trump called the largest trade deal in history after Tokyo pledged to set up a $550 billion fund for investment into the US, details of which remain obscure.

Japan will invest $550 billion in the U.S. and allow the U.S. to tax Japanese goods sold in America at 15 percent.