If the government is giving loans called bailouts to banks & corporations, when will they pay it back?

Where is the contract that every legal loan requires with a deadline for repayment to the government (people) for borrowing our money? If they are borrowing our tax dollars, I want to see the legal doents authorizing our taxes to pay for banks and corporations who are receiving these loans. I want to see the repayment structure since they're tapping into the retirement funds of every American citizen. Has anyone seen these doents? Certainly they are not hidden from our view, are they? And where does the US Constitution allow such loans to be issued in the first place?