DUP leader Arlene Foster said the "wide-ranging" pact was "good for Northern Ireland and the UK" -  so where will the money be spent?
The heart of the financial package is infrastructure spending - £400m of it over two years.
That is a significant sum given that Northern Ireland's annual infrastructure budget is about £1bn.
The deal specifically mentions the York Street Interchange, a project to ease congestion where three major roads meet in Belfast.
It is expected to cost about £150m, so there should be plenty left over for other major projects.
They could include a planned transport hub in the centre of Belfast and other major roads schemes like the completion of the A5 or A6.
On top of the £400m, there is a further £150m for ultra-fast broadband.
This was a project which was already being scoped by the Department of the Economy before the collapse of Stormont.
It is ultimately about improving the connectivity of rural businesses.
Previous Stormont/Westminster deals have also included infrastructure but they typically involved allowing Stormont to borrow more.
This time it is cold, hard, no-strings-attached cash.
The money for health and education is more modest - given that a figure of £1bn for health alone was being mentioned during the negotiations.
There is a minimum of £250m for health and and we can assume it will get about half the "immediate pressures" money, bringing it to a total of £300m.
That will help ease the problems with waiting lists and give the system some breathing space ahead of a major reform programme.
The "immediate pressures" money for education (about £50m) will go some way to easing a growing row with head teachers who have said they will not impose any more cuts.
There is also £100m to be spent on deprived communities over five years.
It will be interesting to see what the delivery mechanism for that money will be.
Stormont's Social Investment Fund, which was also designed to help those communities, has been mired in controversy.
Another part of this deal is to give flexibility to a previously agreed £500m fund for investment in shared education and housing projects.
Stormont has struggled to spend this money, in its first year just £3m of a £50m allocation was spent.
So its is possible that the new flexibility will allow all that money to go into general infrastructure spending.

The design, said to represent the relationship between the medieval monarchies of Europe and the castles they built, was unveiled on Friday.
But critics including Plaid Cymru's North Wales AM Llyr Gruffydd said it symbolises the oppression of Welsh people.
Monuments body Cadw said the plans were "about investing in Flint".
Flint was one of the first castles to be built in Wales by Edward I - construction began in 1277.
The winning design was selected by a panel following a nation-wide competition, and the architects said it demonstrated "the unstable nature of the crown".
But Mr Gruffydd said a sculpture celebrating the conquest of Wales by Edward I was "inappropriate and insulting".
"The 'ring of steel' is the description given to the chain of castles across Wales that were built to conquer and subjugate Wales," he said.
"From a Welsh perspective, this is certainly not something to celebrate. It does not either reflect the many rich Welsh legends that could have been the source of a far more appropriate sculpture."
A petition has also been launched calling the design "extremely disrespectful". By Monday it had attracted more than 2,000 signatures.
People have also criticised the sculpture on social media.
TJ Buck tweeted: "I think even a 'balloon made of lead' would have gone down better than this idea", while Carolyn Hitt posted: "Flint has rich history of female factory workers. Turn those into legends rather than remember Edward I's Iron Ring."
But Andrew Barrattâ€
Northern Ireland will receive an extra £1bn over the next two years as part of the deal that will see the Democratic Unionist Party's 10 MPs back Theresa May's minority government in Commons votes.
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Plans to create an iron ring sculpture at Flint Castle have been described as "insulting to Wales".