Oil company taxes

Elsewhere on the Internet, someone has pointed out that ExxonMobil paid about $30 billion in income taxes last year, which is the same amount "as the entire bottom 50% of individual taxpayers, which is 65,000,000 people!"

So I got to looking at the income tax bills of the four largest oil companies. If I read their financial statements correctly, this is a list of their income tax expenses:

ExxonMobil: $30 billion.
Chevron: $13.5 billion.
ConocoPhillips: $11.4 billion.
Marathon: $2.9 billion.

For comparison, the total West Virginia state government budget for 2008-09, including the State Road Fund and lottery money, is about $5.56 billion.