blank check

a bank check bearing a signature but no stated amount.
unrestricted authority; a free hand: He was given a blank check in the choice of personnel for the new department.

1885–90 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Idioms & Phrases

blank check

Unrestricted authority, a free hand, as in I'll support most of the chairman's agenda, but I'm not ready to give him a blank check for the company's future. Literally this term signifies a bank check that is signed by the drawer but does not indicate the amount of money, which is filled in by the person to whom it is given. [Late 1800s]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
We can no longer expect public support in the form of a blank check and an
  loosely defined agenda.
But this is not a blank check for the government to trample rights as it
Even if societies elect to keep public funding for some of those things,
  they'll never again be blank check propositions.
Instead, because they're a blank check, they get financed by general government
  revenues including income tax.
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