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Income Taxes | 3 Months Ended
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Mar. 31, 2018
Income Tax Disclosure [Abstract] |
Income Taxes | Income Taxes
| Quarter ended
| 2018 |  | 2017
Income tax provision | $ | 76 |  |  | $ | 67 |
Effective tax rate | 15.0 | % |  | 19.4 | %
Our first quarter effective tax rate was lower than prior year primarily due to the favorable impact of the reduction in the U.S. federal statutory tax rate, as described below, and lapping the cost of repatriating foreign earnings in the prior year, partially offset in the quarter ended March 31, 2018 by the charge of $16 million as described below. In both periods, our effective tax rate benefited from excess tax benefits associated with employee share-based payments. On December 22, 2017, the U.S. government enacted comprehensive Federal tax legislation commonly referred to as the Tax Cuts and Jobs Act of 2017 (the "Tax Act"). The Tax Act significantly modified the U.S. corporate income tax system by, among other things, reducing the federal income tax rate from 35% to 21%, limiting certain deductions, including limiting the deductibility of interest expense to 30% of U.S. Earnings Before Interest, Taxes, Depreciation and Amortization, imposing a mandatory one-time deemed repatriation tax on accumulated foreign earnings and creating a territorial tax system that changes the manner in which future foreign earnings are subject to U.S. tax including the elimination of U.S. federal tax on dividends from foreign subsidiaries, a provision designed to tax global intangible low-taxed income ("GILTI") of foreign subsidiaries and a lower U.S. effective tax rate on certain revenues from sources outside the U.S. On December 22, 2017, the SEC staff issued Staff Accounting Bulletin 118 ("SAB 118") that allows us to record provisional amounts related to the impacts of the Tax Act during a measurement period not to extend beyond one year of the enactment date. In the quarter ended December 31, 2017, we recorded a provisional discrete net tax expense associated with the Tax Act. In the quarter ended March 31, 2018, we recorded a provisional charge of $16 million as an adjustment to the amounts recorded at December 31, 2017 related to the mandatory one-time deemed repatriation tax on accumulated foreign earnings. As of March 31, 2018, the amounts recorded for the Tax Act remain provisional for the mandatory one-time deemed repatriation tax on accumulated foreign earnings, the remeasurement of deferred taxes, and our reassessment of permanently reinvested earnings, uncertain tax positions and valuation allowances. These estimates may be impacted by further analysis and future clarification and guidance regarding available tax accounting methods and elections, earnings and profits computations, state tax conformity to federal tax changes and the impact of the GILTI provisions. We expect to complete our analysis of the amounts recorded upon enactment of the Tax Act within SAB 118's measurement period of one year. Companies subject to GILTI have the option to account for the GILTI tax as a period cost if and when incurred, or to recognize deferred taxes for temporary differences including outside basis differences expected to reverse as GILTI. The Company has elected to account for GILTI as a period cost, and therefore is including GILTI in the effective tax rate calculation.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -URI http://asc.fasb.org/topic&trid=2144680 + Details
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