Income Taxes	6 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes For interim income tax reporting we estimate our annual effective tax rate and apply it to our year to date ordinary income (loss). Tax jurisdictions with a projected or year to date loss for which a tax benefit cannot be realized are excluded. The tax effects of unusual or infrequently occurring items, including changes in judgment about valuation allowances and effects of changes in tax laws or rates, are reported in the interim period in which they occur. We have open tax years from 2008 to 2017 with various significant tax jurisdictions. In the three months ended June 30, 2018 Income tax expense of $519 million primarily resulted from tax expense attributable to entities included in our effective tax rate calculation. We settled a transfer pricing tax matter and reduced our gross uncertain tax positions by $412 million. Adequate reserves had been previously established and as a result, no tax expense or benefit was recognized as a result of this settlement. In the three months ended June 30, 2017 Income tax expense of $534 million primarily resulted from tax expense attributable to entities included in our effective tax rate calculation of $621 million including tax benefits from foreign dividends. In the six months ended June 30, 2018 Income tax expense of $985 million primarily resulted from tax expense attributable to entities included in our effective tax rate calculation. In the six months ended June 30, 2017 Income tax expense of $1.3 billion primarily resulted from tax expense attributable to entities included in our effective tax rate calculation of $1.5 billion including tax benefits from foreign dividends, partially offset by tax benefits related to tax settlements. At June 30, 2018 we had $22.5 billion of net deferred tax assets consisting of net operating losses and income tax credits, capitalized research expenditures and other timing differences that are available to offset future income tax liabilities, partially offset by valuation allowances. We have $3.3 billion of net operating loss carryforwards in Germany that, as a result of reorganizations that took place in 2008 and 2009, are not currently recorded as deferred tax assets. As a result of a final European court decision in June 2018 and subject to final German statutory approval, we anticipate that these loss carryforwards may become available to reduce future taxable income in Germany. If this were to occur, deferred tax assets totaling $1.0 billion would be established for the loss carryforwards, and offsetting valuation allowances would also be established because the deferred tax assets would not meet the more likely than not realizability standard. The Tax Act was signed into law on December 22, 2017. The Tax Act changed many aspects of U.S. corporate income taxation and included reduction of the corporate income tax rate from 35% to 21%, implementation of a territorial tax system and imposition of a tax on deemed repatriated earnings of foreign subsidiaries. We recognized the tax effects of the Tax Act in the three months ended December 31, 2017 and recorded $7.3 billion in tax expense. The tax expense relates almost entirely to the remeasurement of deferred tax assets to the 21% tax rate. Upon completion of our 2017 U.S. income tax return later in 2018 we may identify additional remeasurement adjustments to our recorded deferred tax assets. We will continue to assess our provision for income taxes as future guidance is issued but do not currently anticipate significant revisions will be necessary. Any such revisions will be treated in accordance with the measurement period guidance outlined in Staff Accounting Bulletin No. 118.

Income Taxes

For interim income tax reporting we estimate our annual effective tax rate and apply it to our year to date ordinary income (loss). Tax jurisdictions with a projected or year to date loss for which a tax benefit cannot be realized are excluded. The tax effects of unusual or infrequently occurring items, including changes in judgment about valuation allowances and effects of changes in tax laws or rates, are reported in the interim period in which they occur. We have open tax years from 2008 to 2017 with various significant tax jurisdictions.

In the three months ended June 30, 2018 Income tax expense of $519 million primarily resulted from tax expense attributable to entities included in our effective tax rate calculation. We settled a transfer pricing tax matter and reduced our gross uncertain tax positions by $412 million. Adequate reserves had been previously established and as a result, no tax expense or benefit was recognized as a result of this settlement. In the three months ended June 30, 2017 Income tax expense of $534 million primarily resulted from tax expense attributable to entities included in our effective tax rate calculation of $621 million including tax benefits from foreign dividends.

In the six months ended June 30, 2018 Income tax expense of $985 million primarily resulted from tax expense attributable to entities included in our effective tax rate calculation. In the six months ended June 30, 2017 Income tax expense of $1.3 billion primarily resulted from tax expense attributable to entities included in our effective tax rate calculation of $1.5 billion including tax benefits from foreign dividends, partially offset by tax benefits related to tax settlements.

At June 30, 2018 we had $22.5 billion of net deferred tax assets consisting of net operating losses and income tax credits, capitalized research expenditures and other timing differences that are available to offset future income tax liabilities, partially offset by valuation allowances.

We have $3.3 billion of net operating loss carryforwards in Germany that, as a result of reorganizations that took place in 2008 and 2009, are not currently recorded as deferred tax assets. As a result of a final European court decision in June 2018 and subject to final German statutory approval, we anticipate that these loss carryforwards may become available to reduce future taxable income in Germany. If this were to occur, deferred tax assets totaling $1.0 billion would be established for the loss carryforwards, and offsetting valuation allowances would also be established because the deferred tax assets would not meet the more likely than not realizability standard.

The Tax Act was signed into law on December 22, 2017. The Tax Act changed many aspects of U.S. corporate income taxation and included reduction of the corporate income tax rate from 35% to 21%, implementation of a territorial tax system and imposition of a tax on deemed repatriated earnings of foreign subsidiaries. We recognized the tax effects of the Tax Act in the three months ended December 31, 2017 and recorded $7.3 billion in tax expense. The tax expense relates almost entirely to the remeasurement of deferred tax assets to the 21% tax rate. Upon completion of our 2017 U.S. income tax return later in 2018 we may identify additional remeasurement adjustments to our recorded deferred tax assets. We will continue to assess our provision for income taxes as future guidance is issued but do not currently anticipate significant revisions will be necessary. Any such revisions will be treated in accordance with the measurement period guidance outlined in Staff Accounting Bulletin No. 118.