Exxon Mobil Corp announced estimated 2016 earnings of $7.8 billion, or $1.88 per diluted share. An asset recoverability review was completed in the fourth quarter and resulted in a U.S. Upstream asset impairment charge of about $2 billion mainly related to dry gas operations with undeveloped acreage in the Rocky Mountains region of the U.S. Excluding the impairment charge, full year earnings were $9.9 billion compared with $16.2 billion a year earlier, reflecting lower commodity prices and refining margins.