Almost everyone in this thread seems to be assuming the US would pay for half the shares/equity of these companies.
That is not what is being proposed.
What is being proposed is that the US Govt simply seize half the shares/equity/board voting powers in these companies, without paying a cent for them.
It is a half-nationalization.
Not a half-bailout.
EDIT
I go into more detail and explain in this comment in this same thread: