Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Receivables to be collected from (obligations owed to) related parties, net as of the balance sheet date where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of selling, general and administrative expenses resulting from transactions, excluding transactions that are eliminated in consolidated or combined financial statements, with related party.

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Majority Shareholder, Ownership Percentage

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Mark-Up On Services From Related Party Agreements

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Related Party Transactions - Narrative (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2016	Sep. 30, 2017	Sep. 28, 2016
Related Party Transaction [Line Items]
Number of shares owned by investor (in shares)	188		203
Period covered by related party agreeemnt	24 months
Mark-up on services rendered under related party agreement	5.00%
General corporate expenses		$ 79
Majority Shareholder
Related Party Transaction [Line Items]
Ashland ownership percentage				83.00%
Affiliated Entity
Related Party Transaction [Line Items]
General corporate expenses		$ 79
Affiliated Entity \| Tax Matters Agreement \| Other Long-Term Liabilities
Related Party Transaction [Line Items]
Due to (from) related party	$ 79		$ 74
Ashland \| Majority Shareholder
Related Party Transaction [Line Items]
Number of shares owned by investor (in shares)				170
Ashland \| Affiliated Entity \| Tax Matters Agreement
Related Party Transaction [Line Items]
Due to (from) related party	$ 66		$ 62