Income Taxes	6 Months Ended
Jun. 30, 2018
Income Taxes
Income Taxes	Note 12. Income Taxes Our effective tax rate for the second quarter and first half of 2018 was 13.8% and 13.6%, respectively. In the second quarter and first half of 2018, the effective tax rate was lower than the U.S. federal statutory tax rate of 21%, primarily due to a $25 million benefit recognized upon the reassessment of our reserve for uncertain tax positions based on new information, including interactions with the tax authorities and recent audit settlements. The effective tax rate for the first half of 2018 also reflects benefits recognized from audit settlements in the first quarter of 2018. U.S. Tax Reform The Tax Cuts and Jobs Act (the “Act”) was enacted on December 22, 2017. Among other things, the Act reduces the U.S. federal corporate tax rate from 35% to 21% and requires companies to pay a one-time transition tax on earnings of certain foreign subsidiaries that were previously tax deferred. We have reasonably estimated the effects of the Act and recorded provisional amounts in the fourth quarter of 2017 to remeasure our U.S. federal deferred tax assets and liabilities based on the rates at which they are expected to reverse in the future, which is generally 21%, and for the one-time transition tax. The U.S. Government and state tax authorities are expected to continue to issue guidance regarding the Act, which may result in adjustments to our provisional estimates. We are continuing to analyze certain aspects of the Act and may refine our estimates, which could potentially affect the measurement of our net deferred tax assets or give rise to new deferred tax amounts. In the first half of 2018, we have not recorded any measurement period adjustments to the provisional estimates recorded at the end of 2017. The final determination of the remeasurement of our net deferred tax assets and the transition tax will be completed as additional information becomes available, but no later than one year from the enactment date. Any subsequent adjustments to the provisional amounts will be recorded to current or deferred tax expense in the quarter of 2018 when the analysis is complete.

Note 12. Income Taxes

Our effective tax rate for the second quarter and first half of 2018 was 13.8% and 13.6%, respectively. In the second quarter and first half of 2018, the effective tax rate was lower than the U.S. federal statutory tax rate of 21%, primarily due to a $25 million benefit recognized upon the reassessment of our reserve for uncertain tax positions based on new information, including interactions with the tax authorities and recent audit settlements. The effective tax rate for the first half of 2018 also reflects benefits recognized from audit settlements in the first quarter of 2018.

U.S. Tax Reform

The Tax Cuts and Jobs Act (the “Act”) was enacted on December 22, 2017. Among other things, the Act reduces the U.S. federal corporate tax rate from 35% to 21% and requires companies to pay a one-time transition tax on earnings of certain foreign subsidiaries that were previously tax deferred. We have reasonably estimated the effects of the Act and recorded provisional amounts in the fourth quarter of 2017 to remeasure our U.S. federal deferred tax assets and liabilities based on the rates at which they are expected to reverse in the future, which is generally 21%, and for the one-time transition tax. The U.S. Government and state tax authorities are expected to continue to issue guidance regarding the Act, which may result in adjustments to our provisional estimates. We are continuing to analyze certain aspects of the Act and may refine our estimates, which could potentially affect the measurement of our net deferred tax assets or give rise to new deferred tax amounts.

In the first half of 2018, we have not recorded any measurement period adjustments to the provisional estimates recorded at the end of 2017. The final determination of the remeasurement of our net deferred tax assets and the transition tax will be completed as additional information becomes available, but no later than one year from the enactment date. Any subsequent adjustments to the provisional amounts will be recorded to current or deferred tax expense in the quarter of 2018 when the analysis is complete.