I asked you to identify the source of the tax and income data you mention. Here is mine: http://finance.yahoo.com/q/is?s=XOM+Income+Statement&annual
Exxon's statement of income for 2012. It shows income taxes paid, $31.045 billion. This is the total amount of tax paid globally. each nation in which they operate has its own tax system. Ours only taxes income earned in the US; our tax code also provides for a credit against US taxes in the amount of total foreign tax paid. the foreign tax credit is available to every US corporation that operates in foreign nations.