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Income Taxes	9 Months Ended
	Sep. 30, 2019
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 2009 to 2018 with various significant tax jurisdictions. In the three months ended September 30, 2019 Income tax expense of $271 million was primarily due to tax expense attributable to entities included in our effective tax rate calculation, partially offset by U.S. tax benefits from foreign activity. In the three months ended September 30, 2018 Income tax expense of $100 million was primarily due to tax expense attributable to entities included in our effective tax rate calculation, partially offset by a $157 million tax change related to U.S. tax reform. In the nine months ended September 30, 2019 Income tax expense of $932 million was primarily due to tax expense attributable to entities included in our effective tax rate calculation, partially offset by U.S. tax benefits from foreign activity, tax settlements, and a release of valuation allowance. In the nine months ended September 30, 2018 Income tax expense of $1.1 billion was primarily due to tax expense attributable to entities included in our effective tax rate calculation, partially offset by a $157 million tax change related to U.S. tax reform. At September 30, 2019 we had $23.1 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.

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-URI http://asc.fasb.org/topic&trid=2144680

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