Income Taxes	9 Months Ended
Jun. 30, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes On December 22, 2017, the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (“Tax Act”). The Tax Act contains significant revisions to U.S. federal corporate income tax provisions, including, but not limited to, a reduction of the U.S. federal corporate statutory tax rate from 35% to 21%, a one-time transition tax on accumulated foreign earnings, an income inclusion of global intangible low-taxed income (“GILTI”), a deduction against foreign-derived intangible income (“FDII”) and a new minimum tax, the base erosion anti-abuse tax (“BEAT”). In accordance with ASC 740, the Company recorded the effects of the Tax Act during the three months ended December 31, 2017. The reduction in U.S. federal corporate statutory tax rate from 35% to 21% was effective January 1, 2018. The Tax Act requires companies with a fiscal year that begins before and ends after the effective date of the rate change to calculate a blended tax rate based on the pro rata number of days in the fiscal year before and after the effective date. As a result, for the fiscal year ending September 30, 2018, the Company’s U.S. federal statutory income tax rate was 24.5%. For the fiscal year ending September 30, 2019, the Company will be subject to the U.S. federal corporate statutory tax rate of 21%. The reduction in the U.S. federal corporate statutory tax rate required the Company to adjust its U.S. deferred tax assets and liabilities using the newly enacted tax rate of 21%. As a result, the Company recorded a U.S. income tax expense of $23 million for the reduction of its net U.S. deferred tax assets for the year ended September 30, 2018. The Company has not recorded any income tax liability related to the one-time transition tax on accumulated foreign earnings (“Transition Tax”) due to an overall deficit in accumulated foreign earnings. GILTI, FDII and BEAT are effective for the Company’s fiscal year ending September 30, 2019. The Company expects that the impact of GILTI offset by FDII will increase its U.S. federal tax in fiscal 2019 due primarily to the negative impact of U.S. net operating loss carryforward utilization on the allowable GILTI and FDII deductions. The Company has elected to recognize the GILTI impact in the specific period in which it occurs. For the three and nine months ended June 30, 2019, the Company recorded an income tax benefit of $12 million and expense of $86 million, respectively. The income tax benefit for the three months ended June 30, 2019 is lower than the expected tax at the statutory tax rate of 21% primarily due to a change in components of forecasted income that resulted in a decrease of the GILTI impact and higher foreign tax credit utilization. The income tax expense for the nine months ended June 30, 2019 is higher than the expected tax at the statutory tax rate of 21% primarily due to GILTI, non-deductible long term incentive plan, U.S. state and local taxes, foreign income taxed at rates higher than the U.S. statutory tax rate, income withholding taxes, foreign losses with no tax benefit offset by the tax benefit of a reduction in foreign income tax rates. For the three and nine months ended June 30, 2018, the Company recorded an income tax expense of $61 million and $132 million, respectively. The income tax expense for the three months ended June 30, 2018 is lower than the expected tax at the blended statutory tax rate of 24.5% primarily due to recognition of a deferred tax asset related to a prior year intergroup transfer, $9 million change in provisional amount for the U.S. income tax reform and a release of uncertain tax positions partially offset by state tax expense. The income tax expense for the nine months ended June 30, 2018 is greater than the expected income tax expense at the blended statutory tax rate of 24.5% primarily due to a U.S. income tax expense of $17 million arising from a reduction in net U.S. deferred tax assets due to the change in the U.S. statutory tax rate, state tax expense, foreign income taxed at rates higher than the U.S. statutory tax rate, income withholding taxes, foreign losses with no tax benefit reduced by recognition of the deferred tax asset related to a prior year intergroup transfer and a release in uncertain tax positions. The Company has determined that it is reasonably possible that the gross unrecognized tax benefits as of June 30, 2019 could decrease by up to approximately $2 million related to various ongoing audits and settlement discussions in various foreign jurisdictions during the next twelve months.

Income Taxes

On December 22, 2017, the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (“Tax Act”). The Tax Act contains significant revisions to U.S. federal corporate income tax provisions, including, but not limited to, a reduction of the U.S. federal corporate statutory tax rate from 35% to 21%, a one-time transition tax on accumulated foreign earnings, an income inclusion of global intangible low-taxed income (“GILTI”), a deduction against foreign-derived intangible income (“FDII”) and a new minimum tax, the base erosion anti-abuse tax (“BEAT”). In accordance with ASC 740, the Company recorded the effects of the Tax Act during the three months ended December 31, 2017.

The reduction in U.S. federal corporate statutory tax rate from 35% to 21% was effective January 1, 2018. The Tax Act requires companies with a fiscal year that begins before and ends after the effective date of the rate change to calculate a blended tax rate based on the pro rata number of days in the fiscal year before and after the effective date. As a result, for the fiscal year ending September 30, 2018, the Company’s U.S. federal statutory income tax rate was 24.5%. For the fiscal year ending September 30, 2019, the Company will be subject to the U.S. federal corporate statutory tax rate of 21%.

The reduction in the U.S. federal corporate statutory tax rate required the Company to adjust its U.S. deferred tax assets and liabilities using the newly enacted tax rate of 21%. As a result, the Company recorded a U.S. income tax expense of $23 million for the reduction of its net U.S. deferred tax assets for the year ended September 30, 2018.

The Company has not recorded any income tax liability related to the one-time transition tax on accumulated foreign earnings (“Transition Tax”) due to an overall deficit in accumulated foreign earnings. GILTI, FDII and BEAT are effective for the Company’s fiscal year ending September 30, 2019. The Company expects that the impact of GILTI offset by FDII will increase its U.S. federal tax in fiscal 2019 due primarily to the negative impact of U.S. net operating loss carryforward utilization on the allowable GILTI and FDII deductions. The Company has elected to recognize the GILTI impact in the specific period in which it occurs.

For the three and nine months ended June 30, 2019, the Company recorded an income tax benefit of $12 million and expense of $86 million, respectively. The income tax benefit for the three months ended June 30, 2019 is lower than the expected tax at the statutory tax rate of 21% primarily due to a change in components of forecasted income that resulted in a decrease of the GILTI impact and higher foreign tax credit utilization. The income tax expense for the nine months ended June 30, 2019 is higher than the expected tax at the statutory tax rate of 21% primarily due to GILTI, non-deductible long term incentive plan, U.S. state and local taxes, foreign income taxed at rates higher than the U.S. statutory tax rate, income withholding taxes, foreign losses with no tax benefit offset by the tax benefit of a reduction in foreign income tax rates.

For the three and nine months ended June 30, 2018, the Company recorded an income tax expense of $61 million and $132 million, respectively. The income tax expense for the three months ended June 30, 2018 is lower than the expected tax at the blended statutory tax rate of 24.5% primarily due to recognition of a deferred tax asset related to a prior year intergroup transfer, $9 million change in provisional amount for the U.S. income tax reform and a release of uncertain tax positions partially offset by state tax expense. The income tax expense for the nine months ended June 30, 2018 is greater than the expected income tax expense at the blended statutory tax rate of 24.5% primarily due to a U.S. income tax expense of $17 million arising from a reduction in net U.S. deferred tax assets due to the change in the U.S. statutory tax rate, state tax expense, foreign income taxed at rates higher than the U.S. statutory tax rate, income withholding taxes, foreign losses with no tax benefit reduced by recognition of the deferred tax asset related to a prior year intergroup transfer and a release in uncertain tax positions.

The Company has determined that it is reasonably possible that the gross unrecognized tax benefits as of June 30, 2019 could decrease by up to approximately $2 million related to various ongoing audits and settlement discussions in various foreign jurisdictions during the next twelve months.