Income Taxes	3 Months Ended
Mar. 31, 2019
Income Tax Disclosure [Abstract]
INCOME TAXES	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 expense was $9 million for the three months ended March 31, 2019 compared to income tax expense of $7 million for the three months ended March 31, 2018. The increase in income tax expense was primarily driven by a decrease in discrete benefits offset by lower income before taxes in the three months ended March 31, 2019. The decrease in discrete benefits was primarily driven by favorable audit settlements in international jurisdictions during the three months ended March 31, 2018 that did not recur during the three months ended March 31, 2019. The Company engages in regular discussions and negotiations with taxing authorities regarding tax matters, and the Company has determined that over the next 12 months it expects to resolve certain tax matters related to U.S. and foreign jurisdictions. As a result, as of March 31, 2019, we estimate that it is reasonably possible that gross unrecognized tax benefits may decrease by $5 million to $10 million in the next 12 months.

Income Taxes

3 Months Ended

Mar. 31, 2019

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 expense was $9 million for the three months ended March 31, 2019 compared to income tax expense of $7 million for the three months ended March 31, 2018. The increase in income tax expense was primarily driven by a decrease in discrete benefits offset by lower income before taxes in the three months ended March 31, 2019. The decrease in discrete benefits was primarily driven by favorable audit settlements in international jurisdictions during the three months ended March 31, 2018 that did not recur during the three months ended March 31, 2019.

The Company engages in regular discussions and negotiations with taxing authorities regarding tax matters, and the Company has determined that over the next 12 months it expects to resolve certain tax matters related to U.S. and foreign jurisdictions. As a result, as of March 31, 2019, we estimate that it is reasonably possible that gross unrecognized tax benefits may decrease by $5 million to $10 million in the next 12 months.