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Income taxes	9 Months Ended
Income taxes	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Income taxes	Income taxes Federal income taxes for the interim periods presented have been included in the accompanying financial statements on the basis of an estimated annual effective tax rate. The rate is based on current tax law and for 2014 does not assume reinstatement of the federal research tax credit, which expired at the end of 2013. As of September 30, 2014, the estimated annual effective tax rate for 2014 is about 28 percent, which differs from the 35 percent statutory corporate tax rate due to lower statutory tax rates applicable to our operations in many of the jurisdictions in which we operate and from U.S. tax benefits. The first-quarter 2013 tax provision included a $65 million discrete tax benefit from the reinstatement of the federal research tax credit retroactive to the beginning of 2012.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

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