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Income taxes	9 Months Ended
Income taxes	Sep. 30, 2013
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. As of September 30, 2013, the estimated annual effective tax rate for 2013 is about 24 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. These lower tax rates are generally statutory in nature, without expiration and available to companies that operate in those taxing jurisdictions. The tax provision for the nine months ended September 30, 2013 includes a $65 million discrete tax benefit from the reinstatement in the first quarter of 2013 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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