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Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended					12 Months Ended
Income Taxes - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Income Tax Contingency [Line Items]
Federal corporate statutory income tax blended rate						21.00%	24.50%	35.00%
Tax cuts and jobs act, reduced income tax expense						$ 78
Benefit recognized as a result of the release of a valuation allowance						4	$ (1)	$ 4
Increase in income tax resulting from U.S. tax reform legislation							71
Income tax expense related to deemed repatriation tax on undistributed non-U.S. earnings							4
Withholding taxes related to the change in assertion regarding undistributed earnings		$ 2				2	2
Income tax expense (benefit)	$ (2)	2	$ 3	$ 2	$ 71	57	166	186
KENTUCKY
Income Tax Contingency [Line Items]
Income tax expense (benefit)						(5)
Ashland \| Tax Matters Agreement \| Affiliated Entity
Income Tax Contingency [Line Items]
Increase (decrease) in due to affiliates recognized in selling, general and administrative expense							3
Tax expense related to net indemnity liabilities							1
Net tax-sharing payments								$ 48
Due to (from) related party		$ 66				66	$ 66
Ashland \| Tax Matters Agreement \| Affiliated Entity \| KENTUCKY
Income Tax Contingency [Line Items]
Increase (decrease) in due to affiliates recognized in selling, general and administrative expense						$ 3