U.S. stock futures are heading lower as a deal to rescue the Greek economy now looks much less iron clad than it had just one day ago, pushing markets down in Asia and Europe.

Dow Jones industrial futures are down 64 points to 13,716. The broader S&P futures have fallen 7.8 points to 1,370.40. Nasdaq futures are down 16 points to 2,565.

Finance ministers in Europe postponed desperately needed aid for Greece, some $40 billion. That comes as day after a much more optimistic tone Monday, when the head of the finance ministers of the 17 euro countries says lenders have prepared a "positive" report on the country.

On Tuesday, Home Depot posted rising profits for the third quarter thanks to an improving U.S. housing market.