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Related Party Transactions	3 Months Ended
Related Party Transactions	Dec. 31, 2017
Related Party Transactions [Abstract]
Related Party Transactions	RELATED PARTY TRANSACTIONS At December 31, 2017, Valvoline had total net obligations due to Ashland of $81 million, of which $3 million was recorded in Accrued expenses and other liabilities and the remainder was primarily recorded and Other noncurrent liabilities in the Condensed Consolidated Balance Sheets. At September 30, 2017, Valvoline had total net obligations due to Ashland of $74 million, of which $2 million was recorded in Accrued expenses and other liabilities and the remainder was primarily recorded and Other noncurrent liabilities in the Condensed Consolidated Balance Sheets. These liabilities generally relate to net obligations due to Ashland under the Tax Matters Agreement as well as reimbursements payable to Ashland for certain other contractual obligations, including those related to transition services and other obligations that are intended to transfer to Valvoline as part of the Distribution of Ashland's remaining interest in Valvoline. The increase in total net obligations due to Ashland from September 30, 2017 is primarily related to the change in obligations estimated as due under the Tax Matters Agreement related to the enactment of U.S. tax reform legislation in December 2017. Refer to Note 8 for additional details regarding the Tax Matters Agreement and related obligations.