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Income Taxes
9 Months Ended
Sep. 30, 2013
Income Tax Disclosure [Abstract]  
Income Taxes
 Income Taxes
 
The provision for income taxes for the first nine months of 2013 reflects an estimated annual effective tax rate of 29 percent compared with 30.5 percent for 2012, excluding the items discussed below. The decrease is primarily due to the U.S. research and development tax credit that was expired in 2012, along with expected changes in our geographic mix of profits from a tax perspective.

The 2013 tax provision also includes a benefit of $87 million primarily related to the research and development tax credit that was retroactively extended for 2012 and a benefit of $55 million resulting from true-up of estimated amounts used in the tax provision to the 2012 U.S. tax return as filed in September 2013. This compares to an $81 million negative impact related to nondeductible goodwill in the first nine months of 2012.