Ok. All expenditures relating to the former Departments of Agriculture, Education, Energy, Health and Human Services, Housing and Urban Development, and Labor. Most of the functions provided by these departments should be performed by the states. In addition, Medicaid should be eliminated as it is a state function. NASA should be eliminated as a separate entity (functions reassigned to Defense, Commerce, etc. on a scaled down basis). All SS Disability and related Medicare beneficiaries should be re-evaluated and re-certified by panels of 3 doctors. And this is only the beginning!
SS and Defense have to be cut too.
If you eliminate Medicaid as a federal function, then you cut the program in half. 60 million people are on Medicaid. It would never fly. The political will doesn't exist to make those kinds of cuts. When you combine the entitlement programs, debt servicing costs, and other mandatories like food stamps, unemployment etc. you effectively has spent all of the revenue leaving everything else including DOD.
The stuff you are proposing would never pass. Whoever voted for them would be kicked out of office. If you can't be somewhat realistic about what needs to done, then it really is a worthless exercise. There is no way we can balance the budget in one year.