Dept of Education
Environmental Protection Agency
That should free up a few billion.
Add Dept of Energy to your list.
Don’t forget the DEA, ATF, PBS, EPA, OSHA, DOL, BLM (i.e. Bureau of Land Management, although the other BLM probably has government backing too), and of course HHS.
It's going to take a whole lot more than a few billion. I read somewere that the aircraft carrier currently under construction is running $15 billion alone.