So I read this blog and there appears to be a distinct lack of facts or support. So I took 5 minutes to pull the 2016 annual report.
Now maybe they had tax credits that offset income but according to these financial statements 2014 they had $18 billion in income tax expense 2015 $5 billion in income tax expense and 2016 they had a tax credit of $400 million. Their effective tax rate for 2014, 2015 and 2106 was 35%, 25% and -5%. I am sure I did not pay more than they did for 2014, 2015 and 2016.