Income Taxes	9 Months Ended
Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	12. Income Taxes In December 2017, the United States enacted tax legislation commonly known as the Tax Cuts and Jobs Act (Tax Reform Act), which required a one-time transition tax expense in 2017 on the deemed repatriation of previously deferred foreign earnings and reduced the U.S. corporate tax rate to 21% effective January 1, 2018. As of September 30, 2018, our estimate of the transition tax expense is based on currently available information and interpretations regarding the application of the new tax provisions. The U.S. Treasury, the Internal Revenue Service, and other standard-setting bodies could interpret or issue guidance regarding the provisions of the Tax Reform Act that differ from our interpretation, which could impact our provisional expense. Additional work is necessary to further analyze our historical earnings and other items that affect the calculations. Adjustments to the provisional amounts recorded as of September 30, 2018 and December 31, 2017, will affect our tax expense or benefit from continuing operations in the period that the final adjustments are determined, which will be no later than the fourth quarter of 2018. During the third quarter of 2018, we recorded a tax benefit of $6 million associated with the Tax Reform Act, as a result of the reduction to the deferred tax liability for our U.S. salaried pension plan. We are evaluating certain aspects of the Tax Reform Act which could further impact our deferred tax balances and have not made a policy election with respect to the deferred tax effects of the global intangible low-taxed income (GILTI) provision of the Tax Reform Act. The policy decision will be made no later than the fourth quarter of 2018, and any impact of the decision will be recorded in continuing operations in the fourth quarter.

12. Income Taxes

In December 2017, the United States enacted tax legislation commonly known as the Tax Cuts and Jobs Act (Tax Reform Act), which required a one-time transition tax expense in 2017 on the deemed repatriation of previously deferred foreign earnings and reduced the U.S. corporate tax rate to 21% effective January 1, 2018. As of September 30, 2018, our estimate of the transition tax expense is based on currently available information and interpretations regarding the application of the new tax provisions. The U.S. Treasury, the Internal Revenue Service, and other standard-setting bodies could interpret or issue guidance regarding the provisions of the Tax Reform Act that differ from our interpretation, which could impact our provisional expense. Additional work is necessary to further analyze our historical earnings and other items that affect the calculations. Adjustments to the provisional amounts recorded as of September 30, 2018 and December 31, 2017, will affect our tax expense or benefit from continuing operations in the period that the final adjustments are determined, which will be no later than the fourth quarter of 2018. During the third quarter of 2018, we recorded a tax benefit of $6 million associated with the Tax Reform Act, as a result of the reduction to the deferred tax liability for our U.S. salaried pension plan.

We are evaluating certain aspects of the Tax Reform Act which could further impact our deferred tax balances and have not made a policy election with respect to the deferred tax effects of the global intangible low-taxed income (GILTI) provision of the Tax Reform Act. The policy decision will be made no later than the fourth quarter of 2018, and any impact of the decision will be recorded in continuing operations in the fourth quarter.