Income taxes	3 Months Ended
Nov. 30, 2018
Income Tax Disclosure [Abstract]
Income taxes	Income taxes The effective tax rate for the three months ended November 30, 2018 was 14.2% compared to 21.9% for the three months ended November 30, 2017. The decrease in the effective tax rate for the three months ended November 30, 2018 was significantly impacted by a net reduction to the Company’s estimated annual tax rate for the current year as a result of the U.S. tax law changes, which were enacted on December 22, 2017. Income taxes paid for the three months ended November 30, 2018 were $61 million, compared to $45 million for the three months ended November 30, 2017. U.S. tax law changes In connection with the Company’s ongoing analysis of the impact of the U.S. tax law changes enacted in December 2017 and in accordance with SEC Staff Accounting Bulletin 118 (“SAB 118”), the Company recorded a tax benefit of $12 million during the three months ended November 30, 2018, which is provisional and subject to change. This provisional tax benefit is related to the Company's accrual for the transition tax and other U.S. tax law changes. The Company has not recorded any adjustments to the provisional amounts related to the remeasurement of its net U.S. deferred tax liabilities for the three months ended November 30, 2018. The Company’s analysis of the income tax effects of the U.S. tax law changes could not be finalized as of November 30, 2018. While the Company made reasonable estimates of the impact of the transition tax and the remeasurement of its deferred tax assets and liabilities, the final impact of the U.S. tax law changes may differ from these estimates, due to, among other things, changes in its interpretations and assumptions, technical clarifications from the U.S. Department of the Treasury and IRS and actions the Company may take. The U.S. Department of the Treasury recently issued multiple proposed regulations related to the U.S. tax law changes. The Company is in the process of analyzing any impact on its current current estimates if these proposed regulations are finalized in their current form. The Company expects to finalize such provisional amounts within the time period prescribed by SAB 118. The U.S. tax law changes created new rules that allow the Company to make an accounting policy election to either treat taxes due on future GILTI inclusions in taxable income as either a current period expense or reflect such inclusions related to temporary basis differences in the Company’s measurement of deferred taxes. The Company’s analysis of the new GILTI rules is not complete; therefore, the Company has not made a policy election regarding the tax accounting treatment of the GILTI tax. The Company also continues to evaluate the impact of the GILTI provisions under the U.S. tax law changes which are complex and subject to continuing regulatory interpretation by the IRS. The Company has, however, included an estimate of the current GILTI impact in its effective tax rate for fiscal 2019. The U.S. tax law changes have the potential to change the Company’s assertions with respect to whether earnings of the Company’s foreign subsidiaries should remain indefinitely reinvested. The Company continues to evaluate these changes, therefore, the Company has not made any changes to its indefinite reinvestment assertions.

Income taxes

The effective tax rate for the three months ended November 30, 2018 was 14.2% compared to 21.9% for the three months ended November 30, 2017. The decrease in the effective tax rate for the three months ended November 30, 2018 was significantly impacted by a net reduction to the Company’s estimated annual tax rate for the current year as a result of the U.S. tax law changes, which were enacted on December 22, 2017.

Income taxes paid for the three months ended November 30, 2018 were $61 million, compared to $45 million for the three months ended November 30, 2017.

U.S. tax law changes

In connection with the Company’s ongoing analysis of the impact of the U.S. tax law changes enacted in December 2017 and in accordance with SEC Staff Accounting Bulletin 118 (“SAB 118”), the Company recorded a tax benefit of $12 million during the three months ended November 30, 2018, which is provisional and subject to change. This provisional tax benefit is related to the Company's accrual for the transition tax and other U.S. tax law changes. The Company has not recorded any adjustments to the provisional amounts related to the remeasurement of its net U.S. deferred tax liabilities for the three months ended November 30, 2018.

The Company’s analysis of the income tax effects of the U.S. tax law changes could not be finalized as of November 30, 2018. While the Company made reasonable estimates of the impact of the transition tax and the remeasurement of its deferred tax assets and liabilities, the final impact of the U.S. tax law changes may differ from these estimates, due to, among other things, changes in its interpretations and assumptions, technical clarifications from the U.S. Department of the Treasury and IRS and actions the Company may take. The U.S. Department of the Treasury recently issued multiple proposed regulations related to the U.S. tax law changes. The Company is in the process of analyzing any impact on its current current estimates if these proposed regulations are finalized in their current form. The Company expects to finalize such provisional amounts within the time period prescribed by SAB 118.

The U.S. tax law changes created new rules that allow the Company to make an accounting policy election to either treat taxes due on future GILTI inclusions in taxable income as either a current period expense or reflect such inclusions related to temporary basis differences in the Company’s measurement of deferred taxes. The Company’s analysis of the new GILTI rules is not complete; therefore, the Company has not made a policy election regarding the tax accounting treatment of the GILTI tax. The Company also continues to evaluate the impact of the GILTI provisions under the U.S. tax law changes which are complex and subject to continuing regulatory interpretation by the IRS. The Company has, however, included an estimate of the current GILTI impact in its effective tax rate for fiscal 2019.

The U.S. tax law changes have the potential to change the Company’s assertions with respect to whether earnings of the Company’s foreign subsidiaries should remain indefinitely reinvested. The Company continues to evaluate these changes, therefore, the Company has not made any changes to its indefinite reinvestment assertions.