Most press reports on the announcement of the cost for the International Linear Collider do not include the breakdown of where these costs come from. The rough estimate of the various components are as follows:
M&S/equipment for machine: $4.9B
Conventional facilities: $1.8B
Manpower: 13000 FTE's (full time employee/effort)
Construction time: 7 years
Again, remember that these are quoted in 2007 dollars.
This is certainly a huge project and will require a well-managed international effort. The only question now is (i) where will it be located and (ii) when will it be built. Any delay in deciding this will only drive it its costs, something many people (and countries) can't afford.