Income Taxes	6 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	6. INCOME TAXES Income tax provisions for interim (quarterly) periods are based on an estimated annual effective income tax rate calculated separately from the effect of significant, infrequent or unusual items. Income tax benefit was $12 million for the three months ended June 30, 2018 compared to income tax expense of $33 million for the three months ended June 30, 2017. The decrease in income tax expense was driven by lower income before taxes, the impacts of U.S. Tax Reform and an increase in discrete benefits in the three months ended June 30, 2018. The increase in discrete benefits was primarily driven by favorable audit settlements in international jurisdictions. Income tax benefit was $5 million for the six months ended June 30, 2018 compared to income tax expense of $47 million for the six months ended June 30, 2017. The decrease in income tax expense was driven by lower income before taxes, the impacts of U.S. Tax Reform and an increase in discrete benefits in the six months ended June 30, 2018. The increase in discrete benefits was primarily driven by favorable audit settlements in international jurisdictions, partially offset by the decrease of favorable excess tax benefits of share-based compensation awards. U.S. Tax Reform was enacted in December 2017. The SEC staff issued SAB 118 that allowed the Company to record provisional amounts for the impacts of the legislation, with the requirement that the accounting be completed in a period not to exceed one year from the date of enactment of the legislation. Pursuant to SAB 118, we had reverted to tax law that existed prior to U.S. Tax Reform on the realizability of deferred tax assets for foreign tax credit carryforwards and future repatriation of earnings from our foreign subsidiaries. As of December 31, 2017, the Company had not completed the accounting in its entirety for the tax effects of the legislation. Due to the timing of the enactment and complexities in the tax legislation, we made reasonable estimates of the effects and recorded provisional amounts in our financial statements as of December 31, 2017. The provisional expense related to the re-measurement of our net U.S. deferred tax assets to the 21% corporate income tax rate and the repatriation tax, net of related foreign tax credits. As of June 30, 2018, the Company has made a $2 million reduction to the provisional amount for the repatriation tax due to additional guidance issued in the three months ended June 30, 2018. As we continue to evaluate the impact of U.S. Tax Reform and interpret any additional guidance issued by the U.S. Treasury Department or other standard-setting bodies, we may adjust the provisional amounts. Completion of our accounting could lead to a material increase or decrease in our effective tax rate during 2018. The Company reviewed our United Kingdom net deferred tax assets for recoverability based on the evaluation of positive and negative evidence. A full valuation allowance against net deferred tax assets will be maintained until sufficient positive evidence exists to reduce or eliminate the valuation allowance. The factors considered by management in its determination of the probability of the realization of the deferred tax assets include, but are not limited to, recent historical financial results, historical taxable income, projected future taxable income, the expected timing of the reversals of existing temporary differences and tax planning strategies. As of June 30, 2018, the Company continued to maintain a full valuation allowance against the United Kingdom net deferred tax assets due to insufficient positive evidence and the uncertainty regarding anticipated future earnings at certain subsidiaries in the United Kingdom. The Company engages in continuous discussions and negotiations with taxing authorities regarding tax matters, and the Company has determined that during 2018 it expects to resolve certain tax matters related to U.S. and foreign jurisdictions. As a result, as of June 30, 2018, we estimate that it is reasonably possible that gross unrecognized tax benefits may decrease by $50 million to $55 million in 2018.

6. INCOME TAXES

Income tax provisions for interim (quarterly) periods are based on an estimated annual effective income tax rate calculated separately from the effect of significant, infrequent or unusual items. Income tax benefit was $12 million for the three months ended June 30, 2018 compared to income tax expense of $33 million for the three months ended June 30, 2017. The decrease in income tax expense was driven by lower income before taxes, the impacts of U.S. Tax Reform and an increase in discrete benefits in the three months ended June 30, 2018. The increase in discrete benefits was primarily driven by favorable audit settlements in international jurisdictions.

Income tax benefit was $5 million for the six months ended June 30, 2018 compared to income tax expense of $47 million for the six months ended June 30, 2017. The decrease in income tax expense was driven by lower income before taxes, the impacts of U.S. Tax Reform and an increase in discrete benefits in the six months ended June 30, 2018. The increase in discrete benefits was primarily driven by favorable audit settlements in international jurisdictions, partially offset by the decrease of favorable excess tax benefits of share-based compensation awards.

U.S. Tax Reform was enacted in December 2017. The SEC staff issued SAB 118 that allowed the Company to record provisional amounts for the impacts of the legislation, with the requirement that the accounting be completed in a period not to exceed one year from the date of enactment of the legislation. Pursuant to SAB 118, we had reverted to tax law that existed prior to U.S. Tax Reform on the realizability of deferred tax assets for foreign tax credit carryforwards and future repatriation of earnings from our foreign subsidiaries. As of December 31, 2017, the Company had not completed the accounting in its entirety for the tax effects of the legislation.

Due to the timing of the enactment and complexities in the tax legislation, we made reasonable estimates of the effects and recorded provisional amounts in our financial statements as of December 31, 2017. The provisional expense related to the re-measurement of our net U.S. deferred tax assets to the 21% corporate income tax rate and the repatriation tax, net of related foreign tax credits. As of June 30, 2018, the Company has made a $2 million reduction to the provisional amount for the repatriation tax due to additional guidance issued in the three months ended June 30, 2018. As we continue to evaluate the impact of U.S. Tax Reform and interpret any additional guidance issued by the U.S. Treasury Department or other standard-setting bodies, we may adjust the provisional amounts. Completion of our accounting could lead to a material increase or decrease in our effective tax rate during 2018.

The Company reviewed our United Kingdom net deferred tax assets for recoverability based on the evaluation of positive and negative evidence. A full valuation allowance against net deferred tax assets will be maintained until sufficient positive evidence exists to reduce or eliminate the valuation allowance. The factors considered by management in its determination of the probability of the realization of the deferred tax assets include, but are not limited to, recent historical financial results, historical taxable income, projected future taxable income, the expected timing of the reversals of existing temporary differences and tax planning strategies. As of June 30, 2018, the Company continued to maintain a full valuation allowance against the United Kingdom net deferred tax assets due to insufficient positive evidence and the uncertainty regarding anticipated future earnings at certain subsidiaries in the United Kingdom.

The Company engages in continuous discussions and negotiations with taxing authorities regarding tax matters, and the Company has determined that during 2018 it expects to resolve certain tax matters related to U.S. and foreign jurisdictions. As a result, as of June 30, 2018, we estimate that it is reasonably possible that gross unrecognized tax benefits may decrease by $50 million to $55 million in 2018.