Exxon Mobil Corp (NYSE:XOM) expects a decrease in Q2 earnings by approximately $4 billion due to lower natural gas prices and refining margins. The lower earnings may bring Exxon's net income down to around $7.5 billion. The company estimates lower Q2 earnings due to up to $2.2 billion lower earnings in the upstream division and another up to $2.2 billion decline in the energy products division. Exxon's shares are down 2.22% in the premarket session.