Read all about it on the Government news agency here.
Having run out of our money he is now going to spend the rest of the world's money.
Although there is mention of $1 trillion and then a $5 trillion as well, I suspect it is a load of made up figures.
It seems to be a lot of money that was going to be spent, rolled up and re-announced. This is so murky it will probably make his budgets look clear.