Exxon Mobil said in a regulatory filing Thursday that it was expecting impairments of 2.4billionto2.6 billion in its upstream business. Photo: Michael Nagle/Bloomberg NewsExxon Mobil is expecting up to 2.6billioninimpairmentsinthefourthquarterforitsupstreambusiness,mostlyrelatedtoidledassetsinCalifornia.TheoilandgasgiantsaidinaregulatoryfilingThursdaythatitwasexpectingimpairmentsof2.4 billion to $2.6 billion in its upstream business. ...