Chief Operating Officer Annmarie Erickson says Friday that the proposal is a "draft" and that DIA representatives already have been told it's a "political non-starter."
It calls for the state to give Detroit an unspecified amount of money over a number of years to cover up to $500 million. Museum officials say they've been told that amount is needed to avert a sale of city-owned pieces.
A spokesman for Snyder says Friday the governor doesn't remember receiving a formal proposal.
Detroit's emergency manager filed for bankruptcy this summer.