To drive the point home...
The Democrats made up their numbers.
The ideas are there. If you want to discuss the inherent workability of any of them, fine. For example, there are ways to improve the private health system that simply remove obstacles rather than require trillion-dollar "investments."
I don't recall detailed hundred-page alternatives produced by the Democrats when the Republicans generated their budgets. Or anything with numbers. In fact, I don't recall anything generated by the Democrats back then except strident opposition, either.