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Valvoline - Additional Information (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		7 Months Ended	9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	May 12, 2017	Jun. 30, 2018	Jun. 30, 2017	Sep. 30, 2016
Distribution of Valvoline [Line Items]
Valvoline Shares Owned by Ashland			170
Sale of Stock, Percentage of Ownership after Transaction			83.00%
Stockholders' Equity Note, Stock Split, Conversion Ratio			2.745338
Net assets deficit			$ (187)
Discontinued Operations [Member]
Distribution of Valvoline [Line Items]
Separation costs					$ 13
Selling, General and Administrative Expense [Member]
Distribution of Valvoline [Line Items]
Separation costs	$ 1	$ 28		$ 9	$ 82
Valvoline Inc. [Member]
Distribution of Valvoline [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners						17.00%

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The number of Valvoline Inc. shares owned by Ashland after the initial public offering of Valvoline Inc. was completed.

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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