Since about 75% of EOM revenue comes from overseas, I would expect most of their taxes to be paid the same.
Actually, I pay infinitely higher US taxes on my US earnings than does Exxon-Mobil. For the year 2009, Exxon-Mobil posted earnings of $45.2 Billion, but paid no US income taxes. While I'm heartbroken that Exxon-Mobil finds it so expensive to do business in foreign sh*tholes, requiring US taxpayers to continue to subsidize that activity is bad policy.
Since about 75% of EOM revenue comes from overseas, I would expect most of their taxes to be paid the same.
ExxonMobil 2009 Financial & Operating Review
http://media.corporate-ir.net/media_files/irol/11/115024/XOM_2009F&O.pdf
Page 74 - Upstream breakdown of cost showing different US Taxes Paid
The same can be located for downstream and chemical.