Ashland (ASH) 10-Q 30 Jan 18 2018 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information	3 Months Ended
	Dec. 31, 2017USD ($)shares
Document and Entity Information [Abstract]
Entity Registrant Name	ASHLAND GLOBAL HOLDINGS INC.
Entity Central Index Key	1,674,862
Current Fiscal Year End Date	--09-30
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float | $	$ 4,430,691,414
Entity Common Stock, Shares Outstanding | shares	62,228,812
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Dec. 31, 2017

STATEMENTS OF CONSOLIDATED COMP

STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME (LOSS) (unaudited) - USD ($) $ in Millions		3 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Sales		$ 842	$ 704
Cost of sales		613	515
Gross profit		229	189
Selling, general and administrative expense		171	157
Research and development expense		21	20
Equity and other income		2	3
Operating income		39	15
Net interest and other financing expense		31	122
Other net periodic benefit income		0	2
Net loss on divestitures		1	1
Income (loss) from continuing operations before income taxes		7	(106)
Income tax expense (benefit) - Note I		14	(41)
Loss from continuing operations		(7)	(65)
Income from discontinued operations (net of tax) - Note D		3	75
Net income (loss)		(4)	10
Net income attributable to noncontrolling interest	[1]	0	11
Net loss attributable to Ashland		$ (4)	$ (1)
Basic earnings per share - Note L
Loss from continuing operations attributable to Ashland		$ (0.12)	$ (1.05)
Income from discontinued operations attributable to Ashland		0.05	1.04
Net loss attributable to Ashland		(0.07)	(0.01)
Diluted earnings per share - Note L
Loss from continuing operations attributable to Ashland		(0.12)	(1.05)
Income from discontinued operations attributable to Ashland		0.05	1.04
Net loss attributable to Ashland		$ (0.07)	$ (0.01)
COMPREHENSIVE INCOME (LOSS)
Net loss		$ (4)	$ 10
Other comprehensive income (loss), net of tax - Note M
Unrealized translation gain (loss)		3	(146)
Net change in available-for-sale securities		8	0
Pension and postretirement obligation adjustment		0	(1)
Other comprehensive income (loss)		11	(147)
Comprehensive income (loss)		7	(137)
Comprehensive income attributable to noncontrolling interest		0	10
Comprehensive income (loss) attributable to Ashland		$ 7	$ (147)
[1]	For the three months ended December 31, 2016, this represents the income attributable to the previous noncontrolling interest in Valvoline Inc., whose results are now included within discontinued operations. See Note B for more information.

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) - USD ($) $ in Millions		Dec. 31, 2017	Sep. 30, 2017
Current assets
Cash and cash equivalents		$ 601	$ 566
Accounts receivable	[1]	597	612
Inventories - Note F		674	634
Other assets		92	91
Total current assets		1,964	1,903
Property, plant and equipment
Cost		3,795	3,762
Accumulated depreciation		1,850	1,792
Net property, plant and equipment		1,945	1,970
Goodwill - Note G		2,475	2,465
Intangibles - Note G		1,298	1,319
Restricted investments - Note E		315	302
Asbestos insurance receivable - Note K		205	209
Deferred income taxes		28	28
Other assets		425	422
Total noncurrent assets		6,691	6,715
Total assets		8,655	8,618
Current liabilities
Short-term debt - Note H		355	235
Trade and other payables		382	409
Accrued expenses and other liabilities		266	324
Total current liabilities		1,003	968
Noncurrent liabilities
Long-term debt - Note H		2,584	2,584
Asbestos litigation reserve - Note K		676	694
Deferred income taxes		390	375
Employee benefit obligations - Note J		194	191
Other liabilities		409	400
Total noncurrent liabilities		4,253	4,244
Commitments and contingencies - Note K
Stockholders' equity		3,399	3,406
Total liabilities and stockholders' equity		$ 8,655	$ 8,618
[1]	Accounts receivable includes an allowance for doubtful accounts of $9 million at December 31, 2017 and September 30, 2017

CONDENSED CONSOLIDATED BALANCE4

CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2017	Sep. 30, 2017
Current assets
Allowance for doubtful accounts	$ 9	$ 9

STATEMENT OF CONSOLIDATED EQUIT

STATEMENT OF CONSOLIDATED EQUITY (unaudited) - 3 months ended Dec. 31, 2017 - USD ($) $ in Millions		Total	Common stock [Member]	Paid-in capital [Member]	Retained earnings [Member]	Accumulated other comprehensive income (loss) [Member]
Beginning Balance at Sep. 30, 2017		$ 3,406	$ 1	$ 931	$ 2,696	$ (222)
Net loss		(4)			(4)
Other comprehensive income		11				11
Regular dividends, $0.225 per common share		(14)			(14)
Common shares issued under stock incentive and other plans	[1]	0		0
Ending Balance at Dec. 31, 2017		$ 3,399	$ 1	$ 931	$ 2,678	$ (211)	[2]
[1]	Common shares issued were 111,400 for the three months ended December 31, 2017.
[2]	At December 31, 2017 and September 30, 2017, the after-tax accumulated other comprehensive loss attributable to Ashland of $211 million and $222 million, respectively, was comprised of net unrealized translation losses of $243 million and $246 million, respectively, net unrealized gains on available-for-sale securities of $29 million and $21 million, respectively, and unrecognized prior service credits as a result of certain employee benefit plan amendments of $3 million for each period.

STATEMENT OF CONSOLIDATED EQUI6

STATEMENT OF CONSOLIDATED EQUITY (unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2017	Sep. 30, 2017
Statement of Stockholders' Equity [Abstract]
Dividends on common stock	$ 0.225
Accumulated other comprehensive loss	$ (211)	$ (222)
Unrecognized prior service credits	3	3
Net unrealized translation loss	(243)	(246)
Available-for-sale securities unrealized gain	$ 29	$ 21
Common shares issued (in shares)	111,400

STATEMENTS OF CONDENSED CONSOLI

STATEMENTS OF CONDENSED CONSOLIDATED CASH FLOWS (unaudited) - USD ($) $ in Millions		3 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
CASH FLOWS PROVIDED (USED) BY OPERATING ACTIVITIES FROM CONTINUING OPERATIONS
Net income (loss)		$ (4)	$ 10
Income from discontinued operations (net of tax)		(3)	(75)
Adjustments to reconcile income from continuing operations to cash flows from operating activities
Depreciation and amortization		79	68
Original issue discount and debt issuance cost amortization		2	94
Deferred income taxes		8	2
Stock based compensation expense		7	5
Gain on early retirement of debt		0	3
Realized gain and investment income on available-for-sale securities		(3)	(3)
Net loss on divestitures		1	1
Pension contributions		(2)	(1)
Gain on post-employment plan remeasurement		0	(2)
Change in operating assets and liabilities	[1]	(109)	(156)
Total cash flows used by operating activities from continuing operations		(24)	(60)
CASH FLOWS PROVIDED (USED) BY INVESTING ACTIVITIES FROM CONTINUING OPERATIONS
Additions to property, plant and equipment		(24)	(33)
Proceeds from Sale of Property, Plant, and Equipment		1	0
Proceeds from sale of operations or equity investments		1	0
Net purchase of funds restricted for specific transactions		(5)	(2)
Reimbursements from restricted investments		5	0
Proceeds from Sale of Available-for-sale Securities		5	0
Payments to Acquire Available-for-sale Securities		5	0
Proceeds from the settlement of derivative instruments		0	4
Payments for Hedge, Investing Activities		2	0
Total cash flows used by investing activities from continuing operations		(24)	(31)
CASH FLOWS PROVIDED (USED) BY FINANCING ACTIVITIES FROM CONTINUING OPERATIONS
Repayment of long-term debt		(2)	(239)
Premium on long-term debt repayment		0	(5)
Proceeds (repayment) from short-term debt		120	(154)
Debt issuance costs		0	(4)
Cash dividends paid		(14)	(24)
Excess Tax Benefit from Share-based Compensation, Financing Activities		(5)	(8)
Total cash flows provided (used) by financing activities from continuing operations		99	(434)
CASH USED BY CONTINUING OPERATIONS		51	(525)
Cash provided (used) by discontinued operations
Operating cash flows, net		(16)	70
Investing cash flows, net		0	(10)
Financing cash flows, net		0	(10)
Total cash provided (used) by discontinued operations		(16)	50
Effect of currency exchange rate changes on cash and cash equivalents		0	(9)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS		35	(484)
CASH AND CASH EQUIVALENTS - BEGINNING OF PERIOD		566	1,017
Change in cash and cash equivalents held by Valvoline		0	(65)
CASH AND CASH EQUIVALENTS - END OF PERIOD		$ 601	$ 468
[1]	Excludes changes resulting from operations acquired or sold.

SIGNIFICANT ACCOUNTING POLICIES

SIGNIFICANT ACCOUNTING POLICIES	3 Months Ended
	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
SIGNIFICANT ACCOUNTING POLICIES	Basis of presentation The accompanying unaudited Condensed Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial reporting and Securities and Exchange Commission (SEC) regulations. In the opinion of management, all adjustments considered necessary for a fair presentation have been included. Additionally, certain prior period data, primarily related to discontinued operations, have been reclassified in the Consolidated Financial Statements and accompanying notes to conform to the current period presentation, as further described in this section. These statements omit certain information and footnote disclosures required for complete annual financial statements and, therefore, should be read in conjunction with Ashland’s Annual Report on Form 10-K for the fiscal year ended September 30, 2017 . Results of operations for the period ended December 31, 2017 are not necessarily indicative of the expected results for the remaining quarters in the fiscal year. On May 12, 2017, Ashland completed the distribution of its remaining 170 million shares of common stock of Valvoline Inc. which represented approximately 83% of the total outstanding shares of Valvoline Inc.'s common stock. This separation from Valvoline represented a strategic shift in Ashland's business and qualified as a discontinued operation. Accordingly, Valvoline's operating results and cash flows for the three months ended December 31, 2016 have been classified as discontinued operations within the Condensed Consolidated Financial Statements. See Note B for additional information on the separation of Valvoline Inc. Subsequent to completing the separation from Valvoline Inc., Ashland's operations are managed within the following three reportable segments: Specialty Ingredients, Composites and Intermediates and Solvents. Use of estimates, risks and uncertainties The preparation of Ashland’s Condensed Consolidated Financial Statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, and the disclosures of contingent assets and liabilities. Significant items that are subject to such estimates and assumptions include, but are not limited to, long-lived assets (including goodwill and other intangible assets), income taxes and liabilities and receivables associated with asbestos litigation and environmental remediation. Although management bases its estimates on historical experience and various other assumptions that are believed to be reasonable under the circumstances, actual results could differ significantly from the estimates under different assumptions or conditions. Ashland’s results are affected by domestic and international economic, political, legislative, regulatory and legal actions. Economic conditions, such as recessionary trends, inflation, interest and monetary exchange rates, government fiscal policies and changes in the prices of certain key raw materials, can have a significant effect on operations. While Ashland maintains reserves for anticipated liabilities and carries various levels of insurance, Ashland could be affected by civil, criminal, regulatory or administrative actions, claims or proceedings relating to asbestos, environmental remediation or other matters. New accounting standards A description of new U.S. GAAP accounting standards issued or adopted during the current year is required in interim financial reporting. A detailed listing of new accounting standards relevant to Ashland is included in the Annual Report on Form 10-K for the fiscal year ended September 30, 2017 . The following standards relevant to Ashland were either issued or adopted in the current period, or will become effective in a subsequent period. In May 2014, the FASB issued accounting guidance outlining a single comprehensive five step model for entities to use in accounting for revenue arising from contracts with customers (ASC 606 Revenue from Contracts with Customers). The new guidance supersedes most current revenue recognition guidance, in an effort to converge the revenue recognition principles within U.S. GAAP. This new guidance also requires entities to disclose certain quantitative and qualitative information regarding the nature, amount, timing and uncertainty of qualifying revenue and cash flows arising from contracts with customers. Entities have the option of using a full retrospective or a modified retrospective approach to adopt the new guidance. Ashland has identified an implementation team that is currently evaluating the impact of the new standard on the Condensed Consolidated Financial Statements and the adoption method options available as well as the overall impact the new guidance will have on the organization. The assessment process consists of categorizing Ashland’s revenue streams and reviewing the current internal accounting policies and practices to determine potential differences that would result from applying the requirements of the new standard to revenue contracts. Additional discussions and meetings with each revenue stream team have occurred to solicit input, identify potential impacts and appropriate changes to Ashland’s business processes, systems and controls to support the revenue recognition and disclosure requirements under the new standard. Based on various preliminary assessments conducted to date, Ashland has identified agreements with distributors and customers that are subject to rebate and incentive programs that could contain elements of material rights and/or variable consideration. Ashland does not currently believe that these elements would result in a material change to how revenue would be recognized for these agreements. Ashland currently intends to adopt this standard using the modified retrospective approach and does not believe the impact will be material to the Condensed Consolidated Financial Statements but does expect there to be significant additional disclosures within the Notes to Condensed Consolidated Financial Statements. This guidance becomes effective for Ashland on October 1, 2018. In March 2017, the FASB issued accounting guidance that will change how employers who sponsor defined benefit pension and/or postretirement benefit plans present the net periodic benefit cost in the Statement of Consolidated Comprehensive Income (Loss). This guidance requires employers to present the service cost component of net periodic benefit cost in the same caption within the Statement of Consolidated Comprehensive Income (Loss) as other employee compensation costs from services rendered during the period. All other components of the net periodic benefit cost will be presented separately outside of the operating income caption. This guidance must be applied retrospectively. Ashland elected to early adopt this guidance on October 1, 2017, which resulted in a reclassification of $2 million in income from the selling, general and administrative expense and cost of sales captions to the other net periodic benefit income caption in the Statement of Consolidated Comprehensive Income (Loss) for the three months ended December 31, 2016 . The components of net periodic benefits income (costs) reclassified primarily relate to interest cost, expected return on assets, curtailments, settlements and actuarial gains and losses. Ashland did not have to adjust the classification of service cost since it previously was recorded within the caption required by the new guidance. See Note J for additional information on net periodic benefit costs. In March 2016, the FASB issued new accounting guidance for certain aspects of share-based payments to employees. This guidance requires all excess tax benefits and tax deficiencies related to share-based payments to be recognized as income tax expense in the Statements of Consolidated Comprehensive Income (Loss) instead of additional paid-in capital, and changes the classification of excess tax benefits from a financing activity to an operating activity within the Statements of Condensed Consolidated Cash Flows. This guidance also allows entities to make an accounting policy election to either estimate the number of awards that are expected to vest or account for forfeitures when they occur. In addition, this guidance increases the amount an employer can withhold to cover income taxes on awards and still qualify for equity classification and requires that cash paid by an employer when directly withholding shares for tax-withholding purposes be classified as a financing activity within the Statements of Condensed Consolidated Cash Flows. The guidance became effective for Ashland and was adopted on October 1, 2017. The guidance specifically related to the Statements of Consolidated Comprehensive Income (Loss) was adopted prospectively while the guidance related to the Statements of Condensed Consolidated Cash Flows was adopted retrospectively, as required by the guidance. Upon adoption, the overall impact on Ashland's Condensed Consolidated Financial Statements was not significant.

VALVOLINE

VALVOLINE	3 Months Ended
	Dec. 31, 2017
Equity [Abstract]
VALVOLINE	Ashland Separation of Valvoline On September 22, 2015, Ashland announced that the Board of Directors approved proceeding with a plan to separate Ashland into two independent, publicly traded companies comprising of the new Ashland (now known as Ashland Global Holdings Inc.) and Valvoline Inc. The initial step of the separation, the initial public offering (IPO) of Valvoline Inc., closed on September 28, 2016. As discussed further within the Final Separation section of this Note, Ashland completed the distribution of its remaining shares in Valvoline Inc. on May 12, 2017. The new Ashland is a premier global leader in providing specialty chemical solutions to customers in a wide range of consumer and industrial markets. Key markets and applications include pharmaceutical, personal care, food and beverage, architectural coatings, adhesives, automotive, construction and energy. After completing the IPO on September 28, 2016 and before the distribution of its remaining shares on May 12, 2017, Ashland owned 170 million shares of Valvoline Inc.’s common stock which represented approximately 83% of the total outstanding shares of Valvoline Inc.’s common stock. As a result, Ashland continued to consolidate Valvoline within the Condensed Consolidated Financial Statements up until the distribution of the remaining shares. The resulting outside stockholders’ interests in Valvoline Inc., which was approximately 17% , was presented separately as a noncontrolling interest within Ashland’s equity in the Condensed Consolidated Balance Sheets up until the distribution of the remaining shares. The amount of consolidated net income attributable to these minority holders is presented as a separate caption on the Statement of Consolidated Comprehensive Income (Loss) for the three months ended December 31, 2016 . Final Separation Ashland completed the distribution of its remaining 170 million shares of common stock of Valvoline Inc. as a pro rata dividend on shares of Ashland common stock outstanding at the close of business on the record date of May 5, 2017. Based on the shares of Ashland common stock outstanding as of May 5, 2017, the record date for the distribution, each share of Ashland common stock received 2.745338 shares of Valvoline common stock in the distribution. The distribution was recorded at the carrying amount of Valvoline Inc.'s net assets which was a deficit of $187 million as of May 12, 2017, as follows: May 12 (In millions) 2017 ASSETS Current assets Cash 179 Accounts receivable, net 385 Inventories 153 Other current assets 24 Total current assets 741 Noncurrent assets Net property, plant and equipment 357 Goodwill 329 Equity and other unconsolidated investments 31 Deferred income taxes 391 Other noncurrent assets 93 Total noncurrent assets 1,201 Total assets $ 1,942 LIABILITIES AND EQUITY Current liabilities Short-term debt 75 Current portion of long-term debt 16 Trade and other payables 353 Other current liabilities 34 Total current liabilities 478 Noncurrent liabilities Long-term debt 662 Employee benefit obligations 826 Other long-term liabilities 163 Total noncurrent liabilities 1,651 Total liabilities $ 2,129 Net deficit $ (187 ) A Tax Matters Agreement between Ashland and Valvoline Inc. governs the rights and obligations after the separation regarding certain income taxes and other taxes, including certain tax liabilities and benefits, attributes, returns and contests. Discontinued Operations Assessment Valvoline met the criteria to qualify as a discontinued operation and accordingly, its operating results and cash flows for the three months ended December 31, 2016 have been classified as discontinued operations within the Condensed Consolidated Financial Statements. See Note D for more information. Costs of transaction Ashland recognized separation costs of $6 million and $28 million for the three months ended December 31, 2017 and 2016 , respectively. Of these amounts, $6 million of separation costs directly related to Valvoline and were included within the discontinued operations caption of the Statement of Consolidated Comprehensive Income (Loss) for the three months ended December 31, 2016 . Otherwise, separation costs are recorded within the selling, general and administrative expense caption of the Statements of Consolidated Comprehensive Income (Loss).

ACQUISITIONS

ACQUISITIONS	3 Months Ended
	Dec. 31, 2017
ACQUISITION AND DIVESTITURE [Abstract]
ACQUISITIONS	Pharmachem Background On May 17, 2017, Ashland completed its acquisition of the stock of Pharmachem Laboratories, Inc. (Pharmachem), a leading provider of quality ingredients to the global health and wellness industries and high-value differentiated products to fragrance and flavor houses. With annual revenues of approximately $300 million and 14 manufacturing facilities in the United States and Mexico, New Jersey-based Pharmachem develops, manufactures and supplies custom and branded nutritional and fragrance products. Ashland has included Pharmachem within the Specialty Ingredients reporting segment. Purchase price allocation The acquisition was recorded by Ashland using the purchase method of accounting in accordance with applicable U.S. GAAP whereby the total purchase price was allocated to tangible and intangible assets and liabilities acquired based on respective fair values. The all-cash purchase price of Pharmachem was $680 million which included working capital adjustments of approximately $20 million . The following table summarizes the current preliminary values of the assets acquired and liabilities assumed at the date of acquisition. At May 17, 2017 Preliminary purchase price allocation (in millions) As Adjusted Assets: Accounts receivable 52 Inventory 74 Other current assets 4 Intangible assets 330 Goodwill 287 Property, plant and equipment 97 Other noncurrent assets 20 Liabilities: Accounts payable (32 ) Deferred tax - net (138 ) Other noncurrent liabilities (14 ) Total purchase price $ 680 As of December 31, 2017 , the purchase price allocation for the acquisition was preliminary. Adjustments to the current fair value estimates in the above table may occur as the process conducted for various valuations and assessments, including certain tangible and intangible assets, are finalized. Goodwill was calculated as the excess of the consideration transferred over the net assets recognized and represents the estimated future economic benefits arising from other assets acquired that could not be individually identified and separately recognized. The factors contributing to the recognition of goodwill were based on strategic benefits that are expected to be realized from the acquisition. None of the goodwill is expected to be deductible for income tax purposes. Intangible assets identified The purchase price allocation included $330 million of certain definite-lived intangible assets which are being amortized over the estimated useful life in proportion to the economic benefits consumed. The determination of the useful lives is based upon various industry studies, historical acquisition experience, economic factors, and future cash flows of the combined company. In addition, Ashland reviewed certain technological trends and also considered the relative stability in the current Pharmachem customer base. The following details the total intangible assets identified as of May 17, 2017. Weighted-average amortization period Intangible asset type (in millions) Value (years) Trademarks and trade names $ 26 15 Intellectual property 68 22 Customer and supplier relationships 236 20 Total $ 330

DISCONTINUED OPERATIONS

DISCONTINUED OPERATIONS	3 Months Ended
	Dec. 31, 2017
Discontinued Operations and Disposal Groups [Abstract]
DISCONTINUED OPERATIONS	In previous periods, Ashland has divested certain businesses that have qualified as discontinued operations. The operating results from these divested businesses and subsequent adjustments related to ongoing assessments of certain retained liabilities and tax items have been recorded within the discontinued operations caption in the Statements of Consolidated Comprehensive Income for all periods presented and are discussed further within this note. As previously discussed in Notes A and B, Ashland completed the distribution of its remaining 170 million shares of common stock of Valvoline Inc. on May 12, 2017. Ashland determined that the Valvoline separation qualified as a discontinued operation, in accordance with U.S. GAAP, since it represents a strategic shift for Ashland and has a major effect on Ashland's operations and financial results. Accordingly, Valvoline's operating results and cash flows for the three months ended December 31, 2016 have been classified as discontinued operations within the Condensed Consolidated Financial Statements. Components of amounts reflected in the Statements of Consolidated Comprehensive Income (Loss) related to discontinued operations are presented in the following table for the three months ended December 31, 2017 and 2016 . Three months ended December 31 (In millions) 2017 2016 Income from discontinued operations (net of tax) Valvoline $ 3 $ 75 Total income from discontinued operations (net of tax) $ 3 $ 75 The following table presents a reconciliation of the historically reported captions within Ashland's Statements of Consolidated Income (Loss) for the income from discontinued operations attributable to Valvoline for the three months ended December 31, 2016 . Three months ended (In millions) December 31, 2016 Income from discontinued operations attributable to Valvoline Sales $ 489 Cost of sales (293 ) Selling, general and administrative expense (82 ) Research and development expense (3 ) Equity and other income 9 Operating income of discontinued operations 120 Net interest and other financing expense (10 ) Pretax income of discontinued operations 110 Income tax expense (35 ) Income from discontinued operations $ 75

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	3 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	As required by U.S. GAAP, Ashland uses applicable guidance for defining fair value, the initial recording and periodic remeasurement of certain assets and liabilities measured at fair value and related disclosures for instruments measured at fair value. Fair value accounting guidance establishes a fair value hierarchy, which prioritizes the inputs to valuation techniques used to measure fair value into three broad levels. The fair value hierarchy gives the highest priority to quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). An instrument’s categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the instrument’s fair value measurement. The three levels within the fair value hierarchy are described as follows. Level 1 – Observable inputs such as unadjusted quoted prices in active markets for identical assets or liabilities. Level 2 – Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly. These include quoted prices for similar assets or liabilities in active markets and quoted prices for identical or similar assets or liabilities in markets that are not active. Level 3 – Unobservable inputs for the asset or liability for which there is little, if any, market activity at the measurement date. Unobservable inputs reflect Ashland’s own assumptions about what market participants would use to price the asset or liability. The inputs are developed based on the best information available in the circumstances, which might include Ashland’s own financial data such as internally developed pricing models, discounted cash flow methodologies, as well as instruments for which the fair value determination requires significant management judgment. For assets that are measured using quoted prices in active markets (Level 1), the total fair value is the published market price per unit multiplied by the number of units held without consideration of transaction costs. Assets and liabilities that are measured using significant other observable inputs (Level 2) are primarily valued by reference to quoted prices of similar assets or liabilities in active markets, adjusted for any terms specific to that asset or liability. For all other assets and liabilities for which unobservable inputs are used (Level 3), fair value is derived through the use of fair value models, such as a discounted cash flow model or other standard pricing models that Ashland deems reasonable. The following table summarizes financial instruments subject to recurring fair value measurements as of December 31, 2017 . (In millions) Carrying value Total fair value Quoted prices in active markets for identical assets Level 1 Significant other observable inputs Level 2 Significant unobservable inputs Level 3 Assets Cash and cash equivalents $ 601 $ 601 $ 601 $ — $ — Restricted investments (a) 345 345 345 — — Deferred compensation investments (b) 160 160 — 160 — Investments of captive insurance company (b) 3 3 3 — — Foreign currency derivatives 4 4 — 4 — Total assets at fair value $ 1,113 $ 1,113 $ 949 $ 164 $ — Liabilities Foreign currency derivatives $ 13 $ 13 $ — $ 13 $ — (a) Included in restricted investments is $30 million classified in the other current assets caption on the Condensed Consolidated Balance Sheets. (b) Included in other noncurrent assets in the Condensed Consolidated Balance Sheets. The following table summarizes financial asset instruments subject to recurring fair value measurements as of September 30, 2017 . (In millions) Carrying value Total fair value Quoted prices in active markets for identical assets Level 1 Significant other observable inputs Level 2 Significant unobservable inputs Level 3 Assets Cash and cash equivalents $ 566 $ 566 $ 566 $ — $ — Restricted investments (a) 332 332 332 — — Deferred compensation investments (b) 158 158 — 158 — Investments of captive insurance company (b) 3 3 3 — — Foreign currency derivatives 2 2 — 2 — Total assets at fair value $ 1,061 $ 1,061 $ 901 $ 160 $ — Liabilities Foreign currency derivatives $ 36 $ 36 $ — $ 36 $ — (a) Included in restricted investments is $30 million classified in the other current assets caption on the Condensed Consolidated Balance Sheets. (b) Included in other noncurrent assets in the Condensed Consolidated Balance Sheets. Restricted investments During 2015, Ashland and Hercules entered into a comprehensive settlement agreement related to certain insurance coverage for asbestos bodily injury claims with Underwriters at Lloyd’s, certain London Companies and Chartis (AIG) member companies, along with National Indemnity Company and Resolute Management, Inc., under which Ashland and Hercules received a total of $398 million (the January 2015 asbestos insurance settlement). Ashland placed $335 million of the settlement funds from the January 2015 asbestos insurance settlement into a renewable annual trust restricted for the purpose of paying ongoing and future litigation defense and claim settlement costs incurred in conjunction with asbestos claims. These funds were classified primarily as noncurrent restricted investment assets, with $30 million classified within other current assets, in the Condensed Consolidated Balance Sheets as of December 31, 2017 and September 30, 2017 . During 2015, Ashland diversified the restricted investments received from the January 2015 asbestos insurance settlement into primarily equity and corporate bond mutual funds that are designated as available-for-sale securities, classified as Level 1 measurements within the fair value hierarchy. Available-for-sale securities are reported at fair value with unrealized gains and losses, net of related deferred income taxes, included in the stockholders' equity section of the Condensed Consolidated Balance Sheets as a component of accumulated other comprehensive income (AOCI). Investment income and realized gains and losses on the available-for-sale securities are reported in the net interest and other financing expense caption in the Statements of Consolidated Comprehensive Income. The following table provides a summary of the available-for-sale securities portfolio as of December 31, 2017 and September 30, 2017 : December 31 September 30 (In millions) 2017 2017 Original cost $ 335 $ 335 Accumulated adjustments, net (a) (38 ) (24 ) Adjusted cost, beginning of year 297 311 Investment income (b) 2 9 Unrealized gain 45 35 Realized gain 1 2 Settlement funds 5 2 Disbursements (5 ) (27 ) Fair value $ 345 $ 332 (a) The accumulated adjustments include investment income, realized gains, disbursements and settlements recorded in previous periods. (b) Investment income for the demand deposit includes interest income as well as dividend income transferred from the equity and corporate bond mutual funds. The following table presents gross unrealized gains and losses for the restricted investment available-for-sale securities as of December 31, 2017 and September 30, 2017 : Gross Gross (In millions) Adjusted Cost Unrealized Gain Unrealized Loss Fair Value As of December 31, 2017 Demand Deposit $ 17 $ — $ — $ 17 Equity Mutual Fund 163 45 — 208 Corporate bond Mutual Fund 120 — — 120 Fair value $ 300 $ 45 $ — $ 345 As of September 30, 2017 Demand Deposit $ 9 $ — $ — $ 9 Equity Mutual Fund 168 34 — 202 Corporate bond Mutual Fund 120 1 — 121 Fair value $ 297 $ 35 $ — $ 332 The unrealized gains and losses as of December 31, 2017 and September 30, 2017 were recognized within AOCI. Ashland invests in highly-rated investment grade mutual funds. No other-than-temporary impairment was recognized in AOCI during the three months ended December 31, 2017 and 2016 . The following table presents the investment income and disbursements related to the investments within the portfolio for the three months ended December 31, 2017 and 2016 . Three months ended December 31 (In millions) 2017 2016 Investment income $ 2 $ 3 Realized gains 1 — Disbursements (5 ) — Deferred compensation investments Deferred compensation investments consist of Level 2 measurements within the fair value hierarchy which are comprised primarily of a guaranteed interest fund, a common stock index fund and an intermediate government bond fund. Gains and losses related to deferred compensation investments are immediately recognized within the Statements of Consolidated Comprehensive Income (Loss). Foreign currency derivatives Ashland conducts business in a variety of foreign currencies. Accordingly, Ashland regularly uses foreign currency derivative instruments to manage exposure on certain transactions denominated in foreign currencies to curtail potential earnings volatility effects on certain assets and liabilities, including short-term inter-company loans, denominated in currencies other than Ashland’s functional currency of an entity. These derivative contracts generally require exchange of one foreign currency for another at a fixed rate at a future date and generally have maturities of less than twelve months. All contracts are valued at fair value with net changes in fair value recorded within the selling, general and administrative expense caption. The impacts of these contracts were largely offset by gains and losses resulting from the impact of changes in exchange rates on transactions denominated in non-functional currencies. The following table summarizes the net gains and/or losses recognized during the three months ended December 31, 2017 and 2016 within the Statements of Consolidated Comprehensive Income (Loss). Three months ended December 31 (In millions) 2017 2016 Foreign currency derivative loss $ (11 ) $ (8 ) The following table summarizes the fair values of the outstanding foreign currency derivatives as of December 31, 2017 and September 30, 2017 included in accounts receivable and accrued expenses and other liabilities of the Condensed Consolidated Balance Sheets. December 31 September 30 (In millions) 2017 2017 Foreign currency derivative assets $ 4 $ 2 Notional contract values 425 79 Foreign currency derivative liabilities $ 13 $ 36 Notional contract values 810 1,601 Other financial instruments At December 31, 2017 and September 30, 2017 , Ashland's long-term debt (including the current portion and excluding debt issuance cost discounts) had a carrying value of $2,614 million and 2,615 million , respectively, compared to a fair value of $2,755 million and $2,768 million , respectively. The fair values of long-term debt are based on quoted market prices or, if market prices are not available, the present values of the underlying cash flows discounted at Ashland’s incremental borrowing rates, which are deemed to be Level 2 measurements within the fair value hierarchy.

INVENTORIES

INVENTORIES	3 Months Ended
	Dec. 31, 2017
Inventory Disclosure [Abstract]
INVENTORIES	Inventories are carried at the lower of cost or market. Inventories are primarily stated at cost using the weighted-average cost method. In addition, certain inventories are valued at cost using the last-in, first-out (LIFO) method. The following table summarizes Ashland’s inventories as of the reported Condensed Consolidated Balance Sheet dates. December 31 September 30 (In millions) 2017 2017 Finished products $ 421 $ 390 Raw materials, supplies and work in process 256 245 LIFO reserves (3 ) (1 ) $ 674 $ 634

GOODWILL AND OTHER INTANGIBLES

GOODWILL AND OTHER INTANGIBLES	3 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND OTHER INTANGIBLES	Goodwill Ashland reviews goodwill and indefinite-lived intangible assets for impairment annually or when events and circumstances indicate an impairment may have occurred. This annual assessment is performed as of July 1 and consists of Ashland determining each reporting unit’s current fair value compared to its current carrying value. For its July 1, 2017 assessment, Ashland determined that its reporting units for the allocation of goodwill are its three reportable segments: Specialty Ingredients, Composites and Intermediates and Solvents. At that time, Ashland determined no additional impairment existed. The following is a progression of goodwill by reportable segment for the three months ended December 31, 2017 . Specialty Intermediates (In millions) Ingredients Composites and Solvents (a) Total Balance as of September 30, 2017 $ 2,315 $ 150 $ — $ 2,465 Currency translation adjustment 10 — — 10 Balance as of December 31, 2017 $ 2,325 $ 150 $ — $ 2,475 (a) As of December 31, 2017 , there was accumulated impairment of $171 million related to the Intermediates and Solvents reportable segment. Other intangible assets Intangible assets principally consist of trademarks and trade names, intellectual property and customer and supplier relationships. Intangible assets classified as finite are amortized on a straight-line basis over their estimated useful lives. The cost of trademarks and trade names is amortized principally over 3 to 25 years, intellectual property over 5 to 25 years, and customer and supplier relationships over 3 to 24 years. Ashland annually reviews indefinite-lived intangible assets for possible impairment or whenever events or changes in circumstances indicate that carrying amounts may not be recoverable. Intangible assets were comprised of the following as of December 31, 2017 and September 30, 2017 . December 31, 2017 Gross Net carrying Accumulated carrying (In millions) amount amortization amount Definite-lived intangible assets Trademarks and trade names $ 67 $ (22 ) $ 45 Intellectual property 758 (340 ) 418 Customer and supplier relationships 780 (246 ) 534 Total definite-lived intangible assets 1,605 (608 ) 997 Indefinite-lived intangible assets Trademarks and trade names 301 — 301 Total intangible assets $ 1,906 $ (608 ) $ 1,298 September 30, 2017 Gross Net carrying Accumulated carrying (In millions) amount amortization amount Definite-lived intangible assets Trademarks and trade names $ 67 $ (22 ) $ 45 Intellectual property 757 (326 ) 431 Customer and supplier relationships 777 (235 ) 542 Total definite-lived intangible assets 1,601 (583 ) 1,018 Indefinite-lived intangible assets Trademarks and trade names 301 — 301 Total intangible assets $ 1,902 $ (583 ) $ 1,319 Amortization expense recognized on intangible assets was $24 million and $19 million for the three months ended December 31, 2017 and 2016 , respectively, and is included in the selling, general and administrative expense caption of the Statements of Consolidated Comprehensive Income (Loss). Estimated amortization expense for future periods is $94 million in 2018 (includes three months actual and nine months estimated), $90 million in 2019 , $89 million in 2020 , $89 million in 2021 and $87 million in 2022 . The amortization expense for future periods is an estimate. Actual amounts may change from such estimated amounts due to fluctuations in foreign currency exchange rates, additional intangible asset acquisitions and divestitures, potential impairment, accelerated amortization, or other events.

DEBT

DEBT	3 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
DEBT	The following table summarizes Ashland’s current and long-term debt as of the dates reported in the Condensed Consolidated Balance Sheets. December 31 September 30 (In millions) 2017 2017 4.750% notes, due 2022 $ 1,082 $ 1,082 Term Loan B, due 2024 597 599 6.875% notes, due 2043 376 376 Revolving Credit Facility 285 173 Term Loan A, due 2022 250 250 Term Loan A, due 2020 250 250 Accounts receivable securitization 64 56 6.50% junior subordinated notes, due 2029 51 51 Medium-term notes, due 2019, interest of 9.4% at December 31, 2017 5 5 Other (a) (21 ) (23 ) Total debt 2,939 2,819 Short-term debt (includes current portion of long-term debt) (355 ) (235 ) Long-term debt (less current portion and debt issuance cost discounts) $ 2,584 $ 2,584 (a) Other includes $24 million and $25 million of debt issuance cost discounts as of December 31, 2017 and September 30, 2017 , respectively. The scheduled aggregate maturities of long-term debt by year (including the current portion and excluding debt issuance costs) are as follows: $5 million remaining in 2018 , $11 million in 2019 , $269 million in 2020 , $56 million in 2021 and $1,279 million in 2022 . Ashland Financing Activities 2017 Credit Agreement On May 17, 2017, in conjunction with the closing of the Pharmachem acquisition, Ashland entered into a secured credit agreement (the 2017 Credit Agreement) with a group of lenders. The 2017 Credit Agreement provided for (i) a $250 million three-year term loan A facility (the Three-Year TLA Facility), (ii) a $250 million five-year term loan A facility (the Five-Year TLA Facility and together with the Three-Year TLA Facility, the TLA Facilities) and (iii) a $680 million five-year revolving credit facility (including a $125 million letter of credit sublimit) (the 2017 Revolving Credit Facility). Proceeds of borrowings under the TLA Facilities were used solely to finance the acquisition of Pharmachem, while the proceeds of the 2017 Revolving Credit Facility were used to finance, in part, the acquisition of Pharmachem, to refinance the 2015 Senior Credit Agreement and for general corporate purposes. On May 19, 2017, Ashland entered into Amendment No. 1 to the 2017 Credit Agreement, which increased the aggregate commitments under the 2017 Revolving Credit Facility from $680 million to $800 million . At Ashland’s option, loans issued under the 2017 Credit Agreement bear interest at either LIBOR or an alternate base rate, in each case plus the applicable interest rate margin. Loans bear interest at LIBOR plus 1.75% per annum, in the case of LIBOR borrowings, or at the alternate base rate plus 0.75% , in the alternative, through and including the date of delivery of a quarterly compliance certificate and thereafter the interest rate will fluctuate between LIBOR plus 1.375% per annum and LIBOR plus 2.500% per annum (or between the alternate base rate plus 0.375% per annum and the alternate base rate plus 1.500% per annum), based upon Ashland’s secured facilities ratings or the consolidated net leverage ratio (as defined in the 2017 Credit Agreement) (whichever yields a lower applicable interest rate margin) at such time. In addition, Ashland was required to pay fees of 0.25% per annum on the daily unused amount of the 2017 Revolving Credit Facility through and including the date of delivery of a compliance certificate, and thereafter the fee rate will fluctuate between 0.175% and 0.40% per annum, based upon Ashland’s secured facilities rating or the consolidated net leverage ratio (whichever yields a lower applicable rate). The TLA Facilities may be prepaid at any time without premium. The Three-Year TLA Facility will not amortize and will be due on May 17, 2020. The Five-Year TLA Facility will not amortize in each of the first, second and third years and will amortize at a rate of 20% per annum in each of the fourth and fifth years (payable in equal quarterly installments), with the outstanding balance of the Five-Year TLA Facility to be paid on May 17, 2022. On June 14, 2017, Ashland entered into Amendment No. 2 to the 2017 Credit Agreement, which provided for a new $600 million seven-year senior secured term loan B facility (the 2017 TLB Facility). At Ashland’s option, loans issued under the 2017 TLB Facility bear interest at either (x) LIBOR plus 2.00% per annum or (y) an alternate base rate plus 1.00% per annum. The 2017 TLB Facility may be prepaid at any time. The 2017 TLB Facility amortizes at a rate of 1.00% per annum (payable in equal quarterly installments) with the outstanding balance to be paid on May 17, 2024. 6.50% junior subordinated notes due 2029 In December 2016, Hercules LLC (Hercules) (formerly Hercules Incorporated), an indirect wholly-owned subsidiary of Ashland, repurchased, through a cash tender offer (the Tender Offer), $182 million of the aggregate principal par value amount of its 6.50% junior subordinated notes due 2029 (2029 notes) for an aggregate purchase price of $177 million . As a result of the Tender Offer, the carrying value of the 2029 notes was reduced by $90 million and Ashland recognized a $92 million charge related to accelerated accretion of the recorded debt discount (compared to the total par value) and $5 million of a net gain related to the repayment of the debt. The charge and net gain are included in the net interest and other financing expense caption of the Statements of Consolidated Comprehensive Income (Loss) for the three months ended December 31, 2016 . Open market repurchases of 4.750% notes due 2022 and 3.875% notes due 2018 During the three months ended December 31, 2016 , Ashland executed open market repurchases of its 4.750% notes due 2022 (2022 notes) and its 3.875% notes due 2018 (2018 notes). As a result of these repurchases, the carrying values of the 2022 notes and 2018 notes were reduced by $36 million and $29 million , respectively. Ashland recognized a $2 million charge related to premiums paid in the open market repurchases and accelerated amortization of previously capitalized debt issuance costs, which is included in the net interest and other financing expense caption of the Statements of Consolidated Comprehensive Income (Loss) for the three months ended December 31, 2016 . Remaining borrowing capacity The borrowing capacity remaining under the 2017 Revolving Credit Facility was $467 million due to an outstanding balance of $285 million , as well as a reduction of $48 million for letters of credit outstanding at December 31, 2017 . Ashland's total borrowing capacity at December 31, 2017 was $498 million , which included $31 million of available capacity from the accounts receivable securitization facility. Covenants related to current Ashland debt agreements Ashland's debt contains usual and customary representations, warranties and affirmative and negative covenants, including financial covenants for leverage and interest coverage ratios, limitations on liens, additional subsidiary indebtedness, restrictions on subsidiary distributions, investments, mergers, sale of assets and restricted payments and other customary limitations. As of December 31, 2017 , Ashland is in compliance with all debt agreement covenant restrictions. The maximum consolidated net leverage ratio permitted under Ashland's most recent credit agreement (the 2017 Credit Agreement) is 4.5 . At December 31, 2017 , Ashland’s calculation of the consolidated net leverage ratio was 3.9 . The minimum required consolidated interest coverage ratio under the 2017 Credit Agreement during its entire duration is 3.0 . At December 31, 2017 , Ashland’s calculation of the interest coverage ratio was 4.6 .

INCOME TAXES

INCOME TAXES	3 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
INCOME TAXES	Tax Law Changes The Tax Cuts and Jobs Act (Tax Act) was enacted on December 22, 2017. The Tax Act reduces the U.S. federal corporate tax rate from 35% to 21% , requires companies to pay a one-time transition tax on earnings of certain foreign subsidiaries that were previously tax deferred and creates new taxes on certain foreign sourced earnings. At December 31, 2017, Ashland has not completed the internal accounting assessment for the tax effects of enactment of the Tax Act; however, Ashland determined a reasonable estimate of the effects on our existing deferred tax balances and the one-time transition tax. Ashland recognized a provisional amount for the three months ended December 31, 2017, which is included as a component of income tax expense from continuing operations. Ashland recorded net unfavorable tax adjustments of $16 million primarily related to deferred tax rate changes and a one-time transition tax assessed on foreign cash and unremitted earnings. Provisional amounts - Deferred and other income tax assets and liabilities Ashland remeasured certain deferred tax assets and liabilities based on the rates at which they are expected to reverse in the future, which is generally 21% . However, Ashland is still analyzing certain aspects of the Tax Act and refining certain calculations, which could potentially affect the measurement of these balances or potentially give rise to new deferred tax amounts. The provisional amount recorded related to the remeasurement of the deferred tax balance was a favorable tax adjustment of $126 million . Provisional amounts - Foreign tax effects The one-time transition tax is based on Ashland's total post-1986 earnings and profits (E&P) of foreign subsidiaries that were previously deferred from U.S. income taxes. Ashland recorded a provisional amount for this one-time transition tax liability of $142 million . Ashland has not yet completed its calculation of the total post-1986 E&P for these foreign subsidiaries. In addition, the transition tax is based in part on the amount of those earnings held in cash and other specified assets. This amount may change when Ashland finalizes the calculation of post-1986 foreign E&P previously deferred from U.S. federal taxation and finalize the amounts held in cash or other specified assets. No additional income taxes have been provided for any remaining undistributed foreign earnings not subject to the transition tax, or any additional outside basis difference inherent in these entities, as these amounts continue to be indefinitely reinvested in foreign operations. Ashland determined that the amount of unrecognized deferred tax liability related to any remaining undistributed foreign earnings not subject to the transition tax and additional outside basis difference in these entities (i.e., basis difference in excess of that subject to the one-time transition tax) is not practicable at this time. Current fiscal year Ashland’s effective tax rate in any interim period is subject to adjustments related to discrete items and the mix of domestic and foreign operating results. The overall effective tax rate was 200% for the three months ended December 31, 2017 and was primarily impacted by income mix and net unfavorable tax discrete adjustments of $16 million related to the Tax Act. Prior fiscal year The overall effective tax benefit rate was 39% for the three months ended December 31, 2016 and was primarily impacted by income mix. Unrecognized tax benefits Changes in unrecognized tax benefits are summarized as follows for the three months ended December 31, 2017 . (In millions) Balance at October 1, 2017 $ 194 Increases related to positions taken on items from prior years 2 Increases related to positions taken in the current year 3 Balance at December 31, 2017 $ 199 From a combination of statute expirations and audit settlements in the next twelve months, Ashland expects a decrease in the amount accrued for uncertain tax positions of between $22 million and $32 million for continuing operations. It is reasonably possible that there could be other material changes to the amount of uncertain tax positions due to activities of the taxing authorities, settlement of audit issues or the reassessment of existing uncertain tax positions; however, Ashland is not able to estimate the impact of these items at this time.

EMPLOYEE BENEFIT PLANS

EMPLOYEE BENEFIT PLANS	3 Months Ended
	Dec. 31, 2017
Compensation and Retirement Disclosure [Abstract]
EMPLOYEE BENEFIT PLANS	For the three months ended December 31, 2017 , Ashland contributed $2 million to its non-U.S. pension plans and zero to its U.S. pension plans. Ashland expects to make additional contributions of approximately $5 million to its non-U.S. plans and $1 million to its U.S. plans during the remainder of 2018 . Plan Remeasurements Effective January 1, 2017, Ashland discontinued certain post-employment health and life insurance benefits. The effect of these plan changes resulted in a remeasurement gain of $2 million recorded within the other net period benefit cost (income) caption on the Statement of Consolidated Comprehensive Income (Loss) for the three months ended December 31, 2016 . Components of net periodic benefit costs (income) The following table details the components of pension and other postretirement benefit costs for continuing operations. Other postretirement Pension benefits benefits (In millions) 2017 2016 2017 2016 Three months ended December 31 Service cost (a) $ 2 $ 2 $ 1 $ — Interest cost (b) 3 2 — 1 Expected return on plan assets (b) (3 ) (3 ) — — Actuarial gain (b) — — — (2 ) Total net periodic benefit costs (income) $ 2 $ 1 $ 1 $ (1 ) (a) Service cost was not impacted by new accounting guidance adopted in the current quarter and is therefore still classified within the selling, general and administrative expense and cost of sales captions on the Statements of Consolidated Comprehensive Income (Loss). See Note A for additional information. (b) These components are now classified within the other net periodic benefit income caption on the Statements of Consolidated Comprehensive Income (Loss) due to the adoption of new accounting guidance in the current quarter. See Note A for additional information. For segment reporting purposes, service cost for continuing operations is proportionately allocated to each segment, excluding the Unallocated and other segment, while all other costs for continuing operations are recorded within the other net periodic benefit income caption on the Statements of Consolidated Comprehensive Income (Loss).

LITIGATION, CLAIMS AND CONTINGE

LITIGATION, CLAIMS AND CONTINGENCIES	3 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
LITIGATION, CLAIMS AND CONTINGENCIES	Asbestos litigation Ashland and Hercules have liabilities from claims alleging personal injury caused by exposure to asbestos. To assist in developing and annually updating independent reserve estimates for future asbestos claims and related costs given various assumptions, Ashland retained Hamilton, Rabinovitz & Associates, Inc. (HR&A). The methodology used by HR&A to project future asbestos costs is based largely on recent experience, including claim-filing and settlement rates, disease mix, enacted legislation, open claims and litigation defense. The claim experience of Ashland and Hercules are separately compared to the results of previously conducted third party epidemiological studies estimating the number of people likely to develop asbestos-related diseases. Those studies were undertaken in connection with national analyses of the population expected to have been exposed to asbestos. Using that information, HR&A estimates a range of the number of future claims that may be filed, as well as the related costs that may be incurred in resolving those claims. Changes in asbestos-related liabilities and receivables are recorded on an after-tax basis within the discontinued operations caption in the Statements of Consolidated Comprehensive Income. Ashland asbestos-related litigation The claims alleging personal injury caused by exposure to asbestos asserted against Ashland result primarily from indemnification obligations undertaken in 1990 in connection with the sale of Riley Stoker Corporation, a former subsidiary. The amount and timing of settlements and number of open claims can fluctuate from period to period. A summary of Ashland asbestos claims activity, excluding Hercules claims, follows. Three months ended December 31 Years ended September 30 (In thousands) 2017 2016 2017 2016 2015 Open claims - beginning of period 54 57 57 60 65 New claims filed 1 — 2 2 2 Claims settled — — (1 ) — — Claims dismissed (1 ) (1 ) (4 ) (5 ) (7 ) Open claims - end of period 54 56 54 57 60 Ashland asbestos-related liability From the range of estimates, Ashland records the amount it believes to be the best estimate of future payments for litigation defense and claim settlement costs, which generally approximates the mid-point of the estimated range of exposure from model results. Ashland reviews this estimate and related assumptions quarterly and annually updates the results of a non-inflated, non-discounted approximate 50-year model developed with the assistance of HR&A. During the most recent annual update of this estimate completed during the June 2017 quarter, it was determined that the liability for Ashland asbestos-related claims should be increased by $36 million . Total reserves for asbestos claims were $409 million at December 31, 2017 compared to $419 million at September 30, 2017 . A progression of activity in the asbestos reserve is presented in the following table. Three months ended December 31 Years ended September 30 (In millions) 2017 2016 2017 2016 2015 Asbestos reserve - beginning of period $ 419 $ 415 $ 415 $ 409 $ 438 Reserve adjustment — — 36 37 — Amounts paid (10 ) (9 ) (32 ) (31 ) (29 ) Asbestos reserve - end of period (a) $ 409 $ 406 $ 419 $ 415 $ 409 (a) Included $34 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of December 31, 2017 and September 30, 2017 . Ashland asbestos-related receivables Ashland has insurance coverage for certain litigation defense and claim settlement costs incurred in connection with its asbestos claims, and coverage-in-place agreements exist with the insurance companies that provide substantially all of the coverage that will be accessed. For the Ashland asbestos-related obligations, Ashland has estimated the value of probable insurance recoveries associated with its asbestos reserve based on management’s interpretations and estimates surrounding the available or applicable insurance coverage, including an assumption that all solvent insurance carriers remain solvent. Substantially all of the estimated receivables from insurance companies are expected to be due from domestic insurers, all of which are solvent. At December 31, 2017 , Ashland’s receivable for recoveries of litigation defense and claim settlement costs from insurers amounted to $151 million (excluding the Hercules receivable for asbestos claims) compared to $155 million at September 30, 2017 . During the June 2017 quarter, the annual update of the model used for purposes of valuing the asbestos reserve and its impact on valuation of future recoveries from insurers was completed. This model update resulted in a $15 million increase in the receivable for probable insurance recoveries. A progression of activity in the Ashland insurance receivable is presented in the following table. Three months ended December 31 Years ended September 30 (In millions) 2017 2016 2017 2016 2015 Insurance receivable - beginning of period $ 155 $ 151 $ 151 $ 150 $ 402 Receivable adjustment — — 15 16 (3 ) Insurance settlement — — (5 ) (4 ) (227 ) Amounts collected (4 ) (2 ) (6 ) (11 ) (22 ) Insurance receivable - end of period (a) $ 151 $ 149 $ 155 $ 151 $ 150 (a) Included $14 million classified in accounts receivable on the Condensed Consolidated Balance Sheets as of December 31, 2017 and September 30, 2017 . Hercules asbestos-related litigation Hercules has liabilities from claims alleging personal injury caused by exposure to asbestos. Such claims typically arise from alleged exposure to asbestos fibers from resin encapsulated pipe and tank products which were sold by one of Hercules’ former subsidiaries to a limited industrial market. The amount and timing of settlements and number of open claims can fluctuate from period to period. A summary of Hercules’ asbestos claims activity follows. Three months ended December 31 Years ended September 30 (In thousands) 2017 2016 2017 2016 2015 Open claims - beginning of period 12 15 15 20 21 New claims filed — — 1 1 1 Claims dismissed — — (4 ) (6 ) (2 ) Open claims - end of period 12 15 12 15 20 Hercules asbestos-related liability From the range of estimates, Ashland records the amount it believes to be the best estimate of future payments for litigation defense and claim settlement costs, which generally approximates the mid-point of the estimated range of exposure from model results. Ashland reviews this estimate and related assumptions quarterly and annually updates the results of a non-inflated, non-discounted approximate 50-year model developed with the assistance of HR&A. As a result of the most recent annual update of this estimate, completed during the June 2017 quarter, it was determined that the liability for Hercules asbestos-related claims should be increased by $16 million . Total reserves for asbestos claims were $315 million at December 31, 2017 compared to $323 million at September 30, 2017 . A progression of activity in the asbestos reserve is presented in the following table. Three months ended December 31 Years ended September 30 (In millions) 2017 2016 2017 2016 2015 Asbestos reserve - beginning of period $ 323 $ 321 $ 321 $ 311 $ 329 Reserve adjustment — — 16 25 4 Amounts paid (8 ) (3 ) (14 ) (15 ) (22 ) Asbestos reserve - end of period (a) $ 315 $ 318 $ 323 $ 321 $ 311 (a) Included $14 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of December 31, 2017 and September 30, 2017 . Hercules asbestos-related receivables For the Hercules asbestos-related obligations, certain reimbursement obligations pursuant to coverage-in-place agreements with insurance carriers exist. As a result, any increases in the asbestos reserve have been partially offset by probable insurance recoveries. Ashland has estimated the value of probable insurance recoveries associated with its asbestos reserve based on management’s interpretations and estimates surrounding the available or applicable insurance coverage, including an assumption that all solvent insurance carriers remain solvent. The estimated receivable consists exclusively of solvent domestic insurers. As of December 31, 2017 and September 30, 2017 , the receivables from insurers amounted to $68 million . During the June 2017 quarter, the annual update of the model used for purposes of valuing the asbestos reserve and its impact on valuation of future recoveries from insurers was completed. This model update resulted in a $5 million increase in the receivable for probable insurance recoveries. A progression of activity in the Hercules insurance receivable is presented in the following table. Three months ended December 31 Years ended September 30 (In millions) 2017 2016 2017 2016 2015 Insurance receivable - beginning of period $ 68 $ 63 $ 63 $ 56 $ 77 Receivable adjustment — — 5 7 1 Insurance settlement — — — — (22 ) Insurance receivable - end of period $ 68 $ 63 $ 68 $ 63 $ 56 Asbestos litigation cost projection Projecting future asbestos costs is subject to numerous variables that are extremely difficult to predict. In addition to the significant uncertainties surrounding the number of claims that might be received, other variables include the type and severity of the disease alleged by each claimant, the long latency period associated with asbestos exposure, mortality rates, dismissal rates, costs of medical treatment, the impact of bankruptcies of other companies that are co-defendants in claims, uncertainties surrounding the litigation process from jurisdiction to jurisdiction and from case to case, and the impact of potential changes in legislative or judicial standards. Furthermore, any predictions with respect to these variables are subject to even greater uncertainty as the projection period lengthens. In light of these inherent uncertainties, Ashland believes that the asbestos reserves for Ashland and Hercules represent the best estimate within a range of possible outcomes. As a part of the process to develop these estimates of future asbestos costs, a range of long-term cost models was developed. These models are based on national studies that predict the number of people likely to develop asbestos-related diseases and are heavily influenced by assumptions regarding long-term inflation rates for indemnity payments and legal defense costs, as well as other variables mentioned previously. Ashland has currently estimated in various models ranging from approximately 40 to 50 year periods that it is reasonably possible that total future litigation defense and claim settlement costs on an inflated and undiscounted basis could range as high as approximately $660 million for the Ashland asbestos-related litigation (current reserve of $409 million ) and approximately $510 million for the Hercules asbestos-related litigation (current reserve of $315 million ), depending on the combination of assumptions selected in the various models. If actual experience is worse than projected, relative to the number of claims filed, the severity of alleged disease associated with those claims or costs incurred to resolve those claims, or actuarial refinement or improvements to the assumptions used within these models are initiated, Ashland may need to further increase the estimates of the costs associated with asbestos claims and these increases could be material over time. Environmental remediation and asset retirement obligations Ashland is subject to various federal, state and local environmental laws and regulations that require environmental assessment or remediation efforts (collectively environmental remediation) at multiple locations. At December 31, 2017 , such locations included 82 waste treatment or disposal sites where Ashland has been identified as a potentially responsible party under Superfund or similar state laws, 118 current and former operating facilities (including certain operating facilities conveyed as part of the MAP Transaction) and about 1,225 service station properties, of which 36 are being actively remediated. Ashland’s reserves for environmental remediation and related environmental litigation amounted to $168 million at December 31, 2017 compared to $163 million at September 30, 2017 , of which $125 million at December 31, 2017 and $121 million at September 30, 2017 were classified in other noncurrent liabilities on the Condensed Consolidated Balance Sheets. The remaining reserves were classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets. The following table provides a reconciliation of the changes in the environmental remediation reserves during the three months ended December 31, 2017 and 2016 . Three months ended December 31 (In millions) 2017 2016 Reserve - beginning of period $ 163 $ 177 Disbursements (8 ) (7 ) Revised obligation estimates and accretion 13 4 Reserve - end of period $ 168 $ 174 The total reserves for environmental remediation reflect Ashland’s estimates of the most likely costs that will be incurred over an extended period to remediate identified conditions for which the costs are reasonably estimable, without regard to any third-party recoveries. Engineering studies, probability techniques, historical experience and other factors are used to identify and evaluate remediation alternatives and their related costs in determining the estimated reserves for environmental remediation. Ashland continues to discount certain environmental sites and regularly adjusts its reserves as environmental remediation continues. Ashland has estimated the value of its probable insurance recoveries associated with its environmental reserve based on management’s interpretations and estimates surrounding the available or applicable insurance coverage. At December 31, 2017 and September 30, 2017 , Ashland’s recorded receivable for these probable insurance recoveries was $14 million and $15 million , respectively, of which $13 million and $14 million at December 31, 2017 and September 30, 2017 , respectively, were classified in other noncurrent assets on the Condensed Consolidated Balance Sheets. Components of environmental remediation expense included within the selling, general and administrative expense caption of the Statements of Consolidated Comprehensive Income are presented in the following table for the three months ended December 31, 2017 and 2016 . Three months ended December 31 (In millions) 2017 2016 Environmental expense $ 12 $ 4 Accretion 1 — Legal expense 1 2 Total expense 14 6 Insurance receivable (a) — — Total expense, net of receivable activity $ 14 $ 6 (a) Activity of $0 denotes value less than $1 million. Environmental remediation reserves are subject to numerous inherent uncertainties that affect Ashland’s ability to estimate its share of the costs. Such uncertainties involve the nature and extent of contamination at each site, the extent of required cleanup efforts under existing environmental regulations, widely varying costs of alternate cleanup methods, changes in environmental regulations, the potential effect of continuing improvements in remediation technology, and the number and financial strength of other potentially responsible parties at multiparty sites. Although it is not possible to predict with certainty the ultimate costs of environmental remediation, Ashland currently estimates that the upper end of the reasonably possible range of future costs for identified sites could be as high as approximately $412 million . The largest reserve for any site is approximately 15% of the remediation reserve. Other legal proceedings and claims In addition to the matters described above, there are other various claims, lawsuits and administrative proceedings pending or threatened against Ashland and its current and former subsidiaries. Such actions are with respect to commercial matters, product liability, toxic tort liability, and other environmental matters, which seek remedies or damages, some of which are for substantial amounts. While Ashland cannot predict with certainty the outcome of such actions, it believes that adequate reserves have been recorded and losses already recognized with respect to such actions were immaterial as of December 31, 2017 and September 30, 2017 . There is a reasonable possibility that a loss exceeding amounts already recognized may be incurred related to these actions; however, Ashland believes that such potential losses were immaterial as of December 31, 2017 .

EARNINGS PER SHARE

EARNINGS PER SHARE	3 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
EARNINGS PER SHARE	The following is the computation of basic and diluted earnings per share (EPS) from continuing operations attributable to Ashland. Stock appreciation rights (SARs), stock options and warrants available to purchase shares outstanding for each reporting period whose grant price was greater than the average market price of Ashland Common Stock for each applicable period were not included in the computation of income from continuing operations per diluted share because the effect of these instruments would be antidilutive. The total number of these shares outstanding was approximately 0.7 million and 0.9 million at December 31, 2017 and 2016 , respectively. Earnings per share is reported under the treasury stock method. Three months ended December 31 (In millions except per share data) 2017 2016 Numerator Numerator for basic and diluted EPS – Loss from continuing operations $ (7 ) $ (65 ) Denominator Denominator for basic EPS – Weighted-average common shares outstanding 62 62 Share-based awards convertible to common shares (a) — — Denominator for diluted EPS – Adjusted weighted- average shares and assumed conversions 62 62 EPS from continuing operations attributable to Ashland Basic $ (0.12 ) $ (1.05 ) Diluted (0.12 ) (1.05 ) (a) As a result of the loss from continuing operations attributable to Ashland during the three months ended December 31, 2017 and 2016, the effect of the share-based awards convertible to common shares would be antidilutive. In accordance with U.S. GAAP, they have been excluded from the diluted EPS calculation.

EQUITY ITEMS

EQUITY ITEMS	3 Months Ended
	Dec. 31, 2017
Equity [Abstract]
EQUITY ITEMS	Stock repurchase programs In April 2015, Ashland's Board of Directors approved a $1 billion share repurchase authorization that was set to expire on December 31, 2017 (the 2015 stock repurchase program). This authorization allows for Ashland’s common shares to be repurchased in open market transactions, privately negotiated transactions or pursuant to one or more accelerated stock repurchase programs or Rule 10b5-1 plans. During 2017, Ashland's Board of Directors extended the 2015 stock repurchase program indefinitely. As of December 31, 2017, $500 million of share repurchase authorization remains under the 2015 stock repurchase program. Stockholder dividends In May 2017, subsequent to the final distribution of Valvoline Inc.'s common stock, the Board of Directors of Ashland announced a quarterly cash dividend of 22.5 cents per share to eligible shareholders at record which was paid for quarterly dividends in the first quarter of fiscal 2018 and the third and fourth quarters of fiscal 2017. This represented a reduction from the previous quarterly dividend of 39 cents per share which was paid for quarterly dividends in the first and second quarters of fiscal 2017. Accumulated other comprehensive income (loss) Components of other comprehensive income (loss) recorded in the Statements of Consolidated Comprehensive Income (Loss) are presented below, before tax and net of tax effects. 2017 2016 Tax Tax Before (expense) Net of Before (expense) Net of (In millions) tax benefit tax tax benefit tax Three months ended December 31 Other comprehensive income (loss) Unrealized translation gain (loss) $ 3 $ — $ 3 $ (150 ) $ 4 $ (146 ) Pension and postretirement obligation adjustment: Amortization of unrecognized prior service credits included in net income (a) — — — (3 ) 2 (1 ) Net change in available-for-sale securities: Unrealized gains during period 11 (2 ) 9 — — — Reclassification adjustment for realized gains included in net income (1 ) — (1 ) — — — Total other comprehensive income (loss) $ 13 $ (2 ) $ 11 $ (153 ) $ 6 $ (147 ) (a) For the three months ended December 31, 2016, the amortization of unrecognized prior service credits was related to pension and other postretirement benefit plans that transferred to Valvoline and was classified in the discontinued operations caption on the Statements of Consolidated Comprehensive Income (Loss).

STOCK INCENTIVE PLANS

STOCK INCENTIVE PLANS	3 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
STOCK INCENTIVE PLANS	Ashland has stock incentive plans under which key employees or directors are granted stock appreciation rights (SARs), performance awards or nonvested stock awards. Each program is typically a long-term incentive plan designed to link employee compensation with increased shareholder value or reward superior performance and encourage continued employment with Ashland. Ashland recognizes compensation expense for the grant date fair value of stock-based awards over the applicable vesting period. The components of Ashland’s pretax stock-based compensation expense included in continuing operations are as follows: Three months ended December 31 (In millions) 2017 (a) 2016 (b) SARs $ 1 $ 1 Nonvested stock awards 6 4 Performance awards 4 2 $ 11 $ 7 (a) The three months ended December 31, 2017 included $2 million of expense related to cash-settled nonvested restricted stock awards and $2 million of expense related to cash-settled performance units. (b) The three months ended December 31, 2016 included $1 million of expense related to cash-settled nonvested restricted stock awards and $1 million of expense related to cash-settled performance units. SARs SARs are granted to employees or directors at a price equal to the fair market value of the stock on the date of grant and typically become exercisable over periods of one to three years. Unexercised SARs lapse ten years and one month after the date of grant. SARs granted for the three months ended December 31, 2017 and 2016 were 470 thousand and 422 thousand , respectively. As of December 31, 2017 , there was $13 million of total unrecognized compensation costs related to SARs. That cost is expected to be recognized over a weighted-average period of 2.4 years. Ashland estimates the fair value of SARs granted using the Black-Scholes option-pricing model . This model requires several assumptions, which Ashland has developed and updates based on historical trends and current market observations. The accuracy of these assumptions is critical to the estimate of fair value for these equity instruments. Nonvested stock awards Nonvested stock awards are granted to employees or directors at a price equal to the fair market value of the stock on the date of grant and generally vest over a one -to- five -year period. However, such shares or units are subject to forfeiture upon termination of service before the vesting period ends. Only nonvested stock awards granted in the form of shares entitle employees or directors to vote the shares. Dividends on nonvested stock awards granted are in the form of additional units or shares of nonvested stock awards, which are subject to vesting and forfeiture provisions. Stock-settled nonvested stock awards Nonvested stock awards granted in the form of shares were 142 thousand and 81 thousand for the three months ended December 31, 2017 and 2016 , respectively. As of December 31, 2017 , there was $12 million of total unrecognized compensation costs related to these nonvested stock awards. That cost is expected to be recognized over a weighted-average period of 2.0 years. Cash-settled nonvested stock awards Certain nonvested stock awards are granted to employees and are settled in cash upon vesting. As of December 31, 2017 , 220 thousand cash-settled nonvested stock awards were outstanding. The value of these cash-settled nonvested stock awards changes in connection with changes in the fair market value of the Ashland Common Stock. These awards generally vest over a period of three years. The expense recognized related to cash-settled nonvested stock awards was $2 million and $1 million during the three months ended December 31, 2017 and 2016 , respectively. Executive performance incentive and retention program During 2016, certain executives were granted performance-based restricted shares of Ashland in order to provide an incentive to remain employed in the period after the full separation. At December 31, 2017 , there were 60 thousand shares outstanding in connection with these awards, which includes forfeitures and the cumulative value of forfeitable dividends. The expense recognition for these awards commenced upon completing the full separation of Valvoline which occurred on May 12, 2017, as discussed further in Note B, and resulted in $2 million of expense for the three months ended December 31, 2017 . As of December 31, 2017 , there was $8 million of total unrecognized compensation costs related to these awards. Performance awards Ashland sponsors a long-term incentive plan that awards performance shares/units to certain key employees that are primarily tied to Ashland’s overall financial performance relative to internal targets. Additionally, certain outstanding performance awards are tied to Ashland's overall financial performance relative to the financial performance of selected industry peer groups. Awards are granted annually, with each award covering a three -year vesting period. For awards granted in fiscal 2016, each performance share/unit is convertible to one share of Ashland Common Stock. These plans are recorded as a component of stockholders’ equity in the Condensed Consolidated Balance Sheets. Performance measures used to determine the actual number of performance shares issuable upon vesting include an equal weighting of Ashland’s total shareholder return (TSR) performance and Ashland’s return on investment (ROI) performance as compared to the internal targets. TSR relative to peers is considered a market condition while ROI is considered a performance condition under applicable U.S. GAAP. For awards granted in fiscal 2017 and 2018, the performance measure used to determine the actual number of performance shares/units issuable upon vesting is the financial performance of Ashland compared to award targets. The financial performance award metric is considered a performance condition under applicable U.S. GAAP. Additionally, the actual number of performance shares/units issuable upon vesting can be potentially increased or decreased based on a TSR performance modifier relative to peers of Ashland. For awards granted in fiscal 2017, each performance unit will be settled in cash based on the fair value of Ashland common stock. For awards granted in fiscal 2018, each performance share/unit is convertible to one share of Ashland Common Stock. Nonvested performance shares/units do not entitle employees to vote the shares or to receive any dividends thereon. Performance shares/units granted for the three months ended December 31, 2017 and 2016 were 101 thousand and 56 thousand , respectively. As of December 31, 2017 , there was $17 million of total unrecognized compensation costs related to performance shares/units. That cost is expected to be recognized over a weighted-average period of 2.2 years.

REPORTABLE SEGMENT INFORMATION

REPORTABLE SEGMENT INFORMATION	3 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
REPORTABLE SEGMENT INFORMATION	Ashland determines its reportable segments based on how operations are managed internally for the products and services sold to customers, including how the results are reviewed by the chief operating decision maker, which includes determining resource allocation methodologies used for reportable segments. Operating income is the primary measure on the Statements of Consolidated Comprehensive Income (Loss) that is reviewed by the chief operating decision maker in assessing each reportable segment's financial performance. Ashland does not aggregate operating segments to arrive at these reportable segments. Change in Reportable Segments Subsequent to completing the separation from Valvoline Inc. on May 12, 2017, Ashland's operations are managed by the chief operating decision maker within the following three reportable segments: Specialty Ingredients, Composites and Intermediates and Solvents. As a result, the financial information for the new reportable segments (Composites and Intermediates and Solvents) has been disclosed for all periods presented. Prior to the separation from Valvoline Inc., Composites and Intermediates and Solvents were reporting units included within the previous Ashland Performance Materials reportable segment. Reportable segment business descriptions Specialty Ingredients is a global leader in cellulose ethers, vinyl pyrrolidones and biofunctionals. It offers industry-leading products, technologies and resources for solving formulation and product-performance challenges. Specialty Ingredients uses natural, synthetic and semisynthetic polymers derived from cellulose ethers, vinyl pyrrolidones, acrylic polymers, polyester and polyurethane-based adhesives, and plant and seed extract. Specialty Ingredients’ end markets offer comprehensive and innovative solutions for today’s demanding consumer and industrial applications. Key customers include: pharmaceutical companies; makers of personal care products, food and beverages; makers of nutraceuticals and supplements; manufacturers of paint, coatings and construction materials; packaging and converting; and oilfield service companies. On May 17, 2017, Ashland completed its acquisition of the stock of Pharmachem, a leading provider of quality ingredients to the global health and wellness industries and high-value differentiated products to fragrance and flavor houses. With 14 manufacturing facilities in the United States and Mexico, New Jersey-based Pharmachem develops, manufactures and supplies custom and branded nutritional and fragrance products. See Note C for more information. Composites is a global leader in unsaturated polyester resins, vinyl ester resins and gelcoats. The Composites business manufactures and sells a broad range of general-purpose and high-performance grades of unsaturated polyester and vinyl ester resins, gelcoats and low-profile additives for the reinforced plastics industry. The products in the Composites business provide an array of functional properties including corrosion resistance, fire retardance, ultraviolet resistance, water and chemical resistance, high mechanical strength, impact and scratch resistance and high strength-to-weight ratios. Key end markets include transportation, construction, marine and infrastructure. In addition, the business manufactures and sells molten maleic anhydride for the manufacture of a variety of products such as unsaturated polyester resins, copolymers, lubricating oil additives, alkenyl succinic anhydrides, malic acid, fumaric acid and numerous derivative chemicals. Key markets include composites, personal care, dispersants and paper sizing. Intermediates and Solvents is a leading producer of 1,4 butanediol (BDO) and related derivatives, including tetrahydrofuran and n-methylpyrrolidone. These products are used as chemical intermediates in the production of engineering polymers and polyurethanes, and as specialty process solvents in a wide array of applications including electronics, pharmaceuticals, water filtration membranes and more. Butanediol is also supplied to Ashland’s Specialty Ingredients business for use as a raw material. Unallocated and Other generally includes items such as certain significant company-wide restructuring activities, including internal separation costs, and legacy costs or adjustments that relate to divested businesses that are no longer operated by Ashland. Reportable segment results Results of Ashland’s reportable segments are presented based on its management and internal accounting structure. The structure is specific to Ashland; therefore, the financial results of Ashland’s reportable segments are not necessarily comparable with similar information for other comparable companies. Ashland allocates all costs to its reportable segments except for certain significant company-wide restructuring activities and other costs or adjustments that relate to former businesses that Ashland no longer operates. The service cost component of pension and other postretirement benefits costs is allocated to each reportable segment on a ratable basis; while the remaining components of pension and other postretirement benefits costs are recorded within the other net periodic benefit income caption on the Statements of Consolidated Comprehensive Income (Loss). Ashland refines its expense allocation methodologies to the reportable segments from time to time as internal accounting practices are improved, more refined information becomes available and the industry or market changes. Significant revisions to Ashland’s methodologies are adjusted for all segments on a retrospective basis. The following table presents various financial information for each reportable segment for the three months ended December 31, 2017 and 2016 . Three months ended December 31 (In millions - unaudited) 2017 2016 SALES Specialty Ingredients $ 550 $ 482 Composites 218 165 Intermediates and Solvents 74 57 $ 842 $ 704 OPERATING INCOME (LOSS) Specialty Ingredients $ 42 $ 40 Composites 18 15 Intermediates and Solvents 8 (7 ) Unallocated and other (29 ) (33 ) $ 39 $ 15

SIGNIFICANT ACCOUNTING POLICI23

SIGNIFICANT ACCOUNTING POLICIES (Policies)	3 Months Ended
	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of presentation The accompanying unaudited Condensed Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial reporting and Securities and Exchange Commission (SEC) regulations. In the opinion of management, all adjustments considered necessary for a fair presentation have been included. Additionally, certain prior period data, primarily related to discontinued operations, have been reclassified in the Consolidated Financial Statements and accompanying notes to conform to the current period presentation, as further described in this section. These statements omit certain information and footnote disclosures required for complete annual financial statements and, therefore, should be read in conjunction with Ashland’s Annual Report on Form 10-K for the fiscal year ended September 30, 2017 . Results of operations for the period ended December 31, 2017 are not necessarily indicative of the expected results for the remaining quarters in the fiscal year. On May 12, 2017, Ashland completed the distribution of its remaining 170 million shares of common stock of Valvoline Inc. which represented approximately 83% of the total outstanding shares of Valvoline Inc.'s common stock. This separation from Valvoline represented a strategic shift in Ashland's business and qualified as a discontinued operation. Accordingly, Valvoline's operating results and cash flows for the three months ended December 31, 2016 have been classified as discontinued operations within the Condensed Consolidated Financial Statements. See Note B for additional information on the separation of Valvoline Inc. Subsequent to completing the separation from Valvoline Inc., Ashland's operations are managed within the following three reportable segments: Specialty Ingredients, Composites and Intermediates and Solvents.
Use of Estimates, Risk and Uncertainties	Use of estimates, risks and uncertainties The preparation of Ashland’s Condensed Consolidated Financial Statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, and the disclosures of contingent assets and liabilities. Significant items that are subject to such estimates and assumptions include, but are not limited to, long-lived assets (including goodwill and other intangible assets), income taxes and liabilities and receivables associated with asbestos litigation and environmental remediation. Although management bases its estimates on historical experience and various other assumptions that are believed to be reasonable under the circumstances, actual results could differ significantly from the estimates under different assumptions or conditions. Ashland’s results are affected by domestic and international economic, political, legislative, regulatory and legal actions. Economic conditions, such as recessionary trends, inflation, interest and monetary exchange rates, government fiscal policies and changes in the prices of certain key raw materials, can have a significant effect on operations. While Ashland maintains reserves for anticipated liabilities and carries various levels of insurance, Ashland could be affected by civil, criminal, regulatory or administrative actions, claims or proceedings relating to asbestos, environmental remediation or other matters.
New Accounting Standards	New accounting standards A description of new U.S. GAAP accounting standards issued or adopted during the current year is required in interim financial reporting. A detailed listing of new accounting standards relevant to Ashland is included in the Annual Report on Form 10-K for the fiscal year ended September 30, 2017 . The following standards relevant to Ashland were either issued or adopted in the current period, or will become effective in a subsequent period. In May 2014, the FASB issued accounting guidance outlining a single comprehensive five step model for entities to use in accounting for revenue arising from contracts with customers (ASC 606 Revenue from Contracts with Customers). The new guidance supersedes most current revenue recognition guidance, in an effort to converge the revenue recognition principles within U.S. GAAP. This new guidance also requires entities to disclose certain quantitative and qualitative information regarding the nature, amount, timing and uncertainty of qualifying revenue and cash flows arising from contracts with customers. Entities have the option of using a full retrospective or a modified retrospective approach to adopt the new guidance. Ashland has identified an implementation team that is currently evaluating the impact of the new standard on the Condensed Consolidated Financial Statements and the adoption method options available as well as the overall impact the new guidance will have on the organization. The assessment process consists of categorizing Ashland’s revenue streams and reviewing the current internal accounting policies and practices to determine potential differences that would result from applying the requirements of the new standard to revenue contracts. Additional discussions and meetings with each revenue stream team have occurred to solicit input, identify potential impacts and appropriate changes to Ashland’s business processes, systems and controls to support the revenue recognition and disclosure requirements under the new standard. Based on various preliminary assessments conducted to date, Ashland has identified agreements with distributors and customers that are subject to rebate and incentive programs that could contain elements of material rights and/or variable consideration. Ashland does not currently believe that these elements would result in a material change to how revenue would be recognized for these agreements. Ashland currently intends to adopt this standard using the modified retrospective approach and does not believe the impact will be material to the Condensed Consolidated Financial Statements but does expect there to be significant additional disclosures within the Notes to Condensed Consolidated Financial Statements. This guidance becomes effective for Ashland on October 1, 2018. In March 2017, the FASB issued accounting guidance that will change how employers who sponsor defined benefit pension and/or postretirement benefit plans present the net periodic benefit cost in the Statement of Consolidated Comprehensive Income (Loss). This guidance requires employers to present the service cost component of net periodic benefit cost in the same caption within the Statement of Consolidated Comprehensive Income (Loss) as other employee compensation costs from services rendered during the period. All other components of the net periodic benefit cost will be presented separately outside of the operating income caption. This guidance must be applied retrospectively. Ashland elected to early adopt this guidance on October 1, 2017, which resulted in a reclassification of $2 million in income from the selling, general and administrative expense and cost of sales captions to the other net periodic benefit income caption in the Statement of Consolidated Comprehensive Income (Loss) for the three months ended December 31, 2016 . The components of net periodic benefits income (costs) reclassified primarily relate to interest cost, expected return on assets, curtailments, settlements and actuarial gains and losses. Ashland did not have to adjust the classification of service cost since it previously was recorded within the caption required by the new guidance. See Note J for additional information on net periodic benefit costs. In March 2016, the FASB issued new accounting guidance for certain aspects of share-based payments to employees. This guidance requires all excess tax benefits and tax deficiencies related to share-based payments to be recognized as income tax expense in the Statements of Consolidated Comprehensive Income (Loss) instead of additional paid-in capital, and changes the classification of excess tax benefits from a financing activity to an operating activity within the Statements of Condensed Consolidated Cash Flows. This guidance also allows entities to make an accounting policy election to either estimate the number of awards that are expected to vest or account for forfeitures when they occur. In addition, this guidance increases the amount an employer can withhold to cover income taxes on awards and still qualify for equity classification and requires that cash paid by an employer when directly withholding shares for tax-withholding purposes be classified as a financing activity within the Statements of Condensed Consolidated Cash Flows. The guidance became effective for Ashland and was adopted on October 1, 2017. The guidance specifically related to the Statements of Consolidated Comprehensive Income (Loss) was adopted prospectively while the guidance related to the Statements of Condensed Consolidated Cash Flows was adopted retrospectively, as required by the guidance. Upon adoption, the overall impact on Ashland's Condensed Consolidated Financial Statements was not significant.

FAIR VALUE MEASUREMENTS (Polici

FAIR VALUE MEASUREMENTS (Policies)	3 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments Policy	As required by U.S. GAAP, Ashland uses applicable guidance for defining fair value, the initial recording and periodic remeasurement of certain assets and liabilities measured at fair value and related disclosures for instruments measured at fair value. Fair value accounting guidance establishes a fair value hierarchy, which prioritizes the inputs to valuation techniques used to measure fair value into three broad levels. The fair value hierarchy gives the highest priority to quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). An instrument’s categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the instrument’s fair value measurement. The three levels within the fair value hierarchy are described as follows. Level 1 – Observable inputs such as unadjusted quoted prices in active markets for identical assets or liabilities. Level 2 – Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly. These include quoted prices for similar assets or liabilities in active markets and quoted prices for identical or similar assets or liabilities in markets that are not active. Level 3 – Unobservable inputs for the asset or liability for which there is little, if any, market activity at the measurement date. Unobservable inputs reflect Ashland’s own assumptions about what market participants would use to price the asset or liability. The inputs are developed based on the best information available in the circumstances, which might include Ashland’s own financial data such as internally developed pricing models, discounted cash flow methodologies, as well as instruments for which the fair value determination requires significant management judgment. For assets that are measured using quoted prices in active markets (Level 1), the total fair value is the published market price per unit multiplied by the number of units held without consideration of transaction costs. Assets and liabilities that are measured using significant other observable inputs (Level 2) are primarily valued by reference to quoted prices of similar assets or liabilities in active markets, adjusted for any terms specific to that asset or liability. For all other assets and liabilities for which unobservable inputs are used (Level 3), fair value is derived through the use of fair value models, such as a discounted cash flow model or other standard pricing models that Ashland deems reasonable.
Marketable Securities, Available-for-sale Securities, Policy	During 2015, Ashland diversified the restricted investments received from the January 2015 asbestos insurance settlement into primarily equity and corporate bond mutual funds that are designated as available-for-sale securities, classified as Level 1 measurements within the fair value hierarchy. Available-for-sale securities are reported at fair value with unrealized gains and losses, net of related deferred income taxes, included in the stockholders' equity section of the Condensed Consolidated Balance Sheets as a component of accumulated other comprehensive income (AOCI). Investment income and realized gains and losses on the available-for-sale securities are reported in the net interest and other financing expense caption in the Statements of Consolidated Comprehensive Income.
Marketable Securities, Trading Securities, Policy	Gains and losses related to deferred compensation investments are immediately recognized within the Statements of Consolidated Comprehensive Income (Loss).
Derivatives, Methods of Accounting, Derivatives Not Designated or Qualifying as Hedges, Policy	Ashland conducts business in a variety of foreign currencies. Accordingly, Ashland regularly uses foreign currency derivative instruments to manage exposure on certain transactions denominated in foreign currencies to curtail potential earnings volatility effects on certain assets and liabilities, including short-term inter-company loans, denominated in currencies other than Ashland’s functional currency of an entity. These derivative contracts generally require exchange of one foreign currency for another at a fixed rate at a future date and generally have maturities of less than twelve months. All contracts are valued at fair value with net changes in fair value recorded within the selling, general and administrative expense caption. The impacts of these contracts were largely offset by gains and losses resulting from the impact of changes in exchange rates on transactions denominated in non-functional currencies.

INVENTORIES (Policies)

INVENTORIES (Policies)	3 Months Ended
	Dec. 31, 2017
Inventory Disclosure [Abstract]
Inventory Policy	Inventories are carried at the lower of cost or market. Inventories are primarily stated at cost using the weighted-average cost method. In addition, certain inventories are valued at cost using the last-in, first-out (LIFO) method.

GOODWILL AND OTHER INTANGIBLES

GOODWILL AND OTHER INTANGIBLES (Policies)	3 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets, Goodwill, Policy	Ashland reviews goodwill and indefinite-lived intangible assets for impairment annually or when events and circumstances indicate an impairment may have occurred. This annual assessment is performed as of July 1 and consists of Ashland determining each reporting unit’s current fair value compared to its current carrying value. For its July 1, 2017 assessment, Ashland determined that its reporting units for the allocation of goodwill are its three reportable segments: Specialty Ingredients, Composites and Intermediates and Solvents. At that time, Ashland determined no additional impairment existed.
Finite-Lived Intangible Asset Policy	Intangible assets principally consist of trademarks and trade names, intellectual property and customer and supplier relationships. Intangible assets classified as finite are amortized on a straight-line basis over their estimated useful lives. The cost of trademarks and trade names is amortized principally over 3 to 25 years, intellectual property over 5 to 25 years, and customer and supplier relationships over 3 to 24 years.
Goodwill and Intangible Assets, Intangible Assets, Indefinite-Lived, Policy	Ashland annually reviews indefinite-lived intangible assets for possible impairment or whenever events or changes in circumstances indicate that carrying amounts may not be recoverable.

LITIGATION, CLAIMS AND CONTIN27

LITIGATION, CLAIMS AND CONTINGENCIES (Policies)	3 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Policy	Ashland and Hercules have liabilities from claims alleging personal injury caused by exposure to asbestos. To assist in developing and annually updating independent reserve estimates for future asbestos claims and related costs given various assumptions, Ashland retained Hamilton, Rabinovitz & Associates, Inc. (HR&A). The methodology used by HR&A to project future asbestos costs is based largely on recent experience, including claim-filing and settlement rates, disease mix, enacted legislation, open claims and litigation defense. The claim experience of Ashland and Hercules are separately compared to the results of previously conducted third party epidemiological studies estimating the number of people likely to develop asbestos-related diseases. Those studies were undertaken in connection with national analyses of the population expected to have been exposed to asbestos. Using that information, HR&A estimates a range of the number of future claims that may be filed, as well as the related costs that may be incurred in resolving those claims. Changes in asbestos-related liabilities and receivables are recorded on an after-tax basis within the discontinued operations caption in the Statements of Consolidated Comprehensive Income.
Environmental Cost Policy	The total reserves for environmental remediation reflect Ashland’s estimates of the most likely costs that will be incurred over an extended period to remediate identified conditions for which the costs are reasonably estimable, without regard to any third-party recoveries. Engineering studies, probability techniques, historical experience and other factors are used to identify and evaluate remediation alternatives and their related costs in determining the estimated reserves for environmental remediation. Ashland continues to discount certain environmental sites and regularly adjusts its reserves as environmental remediation continues. Ashland has estimated the value of its probable insurance recoveries associated with its environmental reserve based on management’s interpretations and estimates surrounding the available or applicable insurance coverage.

EARNINGS PER SHARE (Policies)

EARNINGS PER SHARE (Policies)	3 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Earnings Per Share Policy	The following is the computation of basic and diluted earnings per share (EPS) from continuing operations attributable to Ashland. Stock appreciation rights (SARs), stock options and warrants available to purchase shares outstanding for each reporting period whose grant price was greater than the average market price of Ashland Common Stock for each applicable period were not included in the computation of income from continuing operations per diluted share because the effect of these instruments would be antidilutive. The total number of these shares outstanding was approximately 0.7 million and 0.9 million at December 31, 2017 and 2016 , respectively. Earnings per share is reported under the treasury stock method.

STOCK INCENTIVE PLANS (Policies

STOCK INCENTIVE PLANS (Policies)	3 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Incentive Plan Policy	Ashland has stock incentive plans under which key employees or directors are granted stock appreciation rights (SARs), performance awards or nonvested stock awards. Each program is typically a long-term incentive plan designed to link employee compensation with increased shareholder value or reward superior performance and encourage continued employment with Ashland. Ashland recognizes compensation expense for the grant date fair value of stock-based awards over the applicable vesting period.

REPORTABLE SEGMENT INFORMATION

REPORTABLE SEGMENT INFORMATION (Policies)	3 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Segment Reporting, Policy [Policy Text Block]	Ashland determines its reportable segments based on how operations are managed internally for the products and services sold to customers, including how the results are reviewed by the chief operating decision maker, which includes determining resource allocation methodologies used for reportable segments. Operating income is the primary measure on the Statements of Consolidated Comprehensive Income (Loss) that is reviewed by the chief operating decision maker in assessing each reportable segment's financial performance. Ashland does not aggregate operating segments to arrive at these reportable segments.

VALVOLINE Valvoline (Tables)

VALVOLINE Valvoline (Tables)	7 Months Ended
	May 12, 2017
Valvoline [Abstract]
Condensed Balance Sheet, Valvoline at Date of Distribution	The distribution was recorded at the carrying amount of Valvoline Inc.'s net assets which was a deficit of $187 million as of May 12, 2017, as follows: May 12 (In millions) 2017 ASSETS Current assets Cash 179 Accounts receivable, net 385 Inventories 153 Other current assets 24 Total current assets 741 Noncurrent assets Net property, plant and equipment 357 Goodwill 329 Equity and other unconsolidated investments 31 Deferred income taxes 391 Other noncurrent assets 93 Total noncurrent assets 1,201 Total assets $ 1,942 LIABILITIES AND EQUITY Current liabilities Short-term debt 75 Current portion of long-term debt 16 Trade and other payables 353 Other current liabilities 34 Total current liabilities 478 Noncurrent liabilities Long-term debt 662 Employee benefit obligations 826 Other long-term liabilities 163 Total noncurrent liabilities 1,651 Total liabilities $ 2,129 Net deficit $ (187 )

ACQUISITIONS (Tables)

ACQUISITIONS (Tables)	3 Months Ended
	Dec. 31, 2017
Business Combinations [Abstract]
Business Combination, Separately Recognized Transactions	The following table summarizes the current preliminary values of the assets acquired and liabilities assumed at the date of acquisition. At May 17, 2017 Preliminary purchase price allocation (in millions) As Adjusted Assets: Accounts receivable 52 Inventory 74 Other current assets 4 Intangible assets 330 Goodwill 287 Property, plant and equipment 97 Other noncurrent assets 20 Liabilities: Accounts payable (32 ) Deferred tax - net (138 ) Other noncurrent liabilities (14 ) Total purchase price $ 680
Schedule of Finite-Lived Intangible Assets as Part of Business Combination	The following details the total intangible assets identified as of May 17, 2017. Weighted-average amortization period Intangible asset type (in millions) Value (years) Trademarks and trade names $ 26 15 Intellectual property 68 22 Customer and supplier relationships 236 20 Total $ 330

DISCONTINUED OPERATIONS (Tables

DISCONTINUED OPERATIONS (Tables)	3 Months Ended
	Dec. 31, 2017
Discontinued Operations and Disposal Groups [Abstract]
Schedule of Disposal Groups Including Discontinued Operations, Income Statement and Balance Sheet Additional Disclosures	Components of amounts reflected in the Statements of Consolidated Comprehensive Income (Loss) related to discontinued operations are presented in the following table for the three months ended December 31, 2017 and 2016 . Three months ended December 31 (In millions) 2017 2016 Income from discontinued operations (net of tax) Valvoline $ 3 $ 75 Total income from discontinued operations (net of tax) $ 3 $ 75 The following table presents a reconciliation of the historically reported captions within Ashland's Statements of Consolidated Income (Loss) for the income from discontinued operations attributable to Valvoline for the three months ended December 31, 2016 . Three months ended (In millions) December 31, 2016 Income from discontinued operations attributable to Valvoline Sales $ 489 Cost of sales (293 ) Selling, general and administrative expense (82 ) Research and development expense (3 ) Equity and other income 9 Operating income of discontinued operations 120 Net interest and other financing expense (10 ) Pretax income of discontinued operations 110 Income tax expense (35 ) Income from discontinued operations $ 75

FAIR VALUE MEASUREMENTS (Tables

FAIR VALUE MEASUREMENTS (Tables)	3 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	The following table summarizes financial instruments subject to recurring fair value measurements as of December 31, 2017 . (In millions) Carrying value Total fair value Quoted prices in active markets for identical assets Level 1 Significant other observable inputs Level 2 Significant unobservable inputs Level 3 Assets Cash and cash equivalents $ 601 $ 601 $ 601 $ — $ — Restricted investments (a) 345 345 345 — — Deferred compensation investments (b) 160 160 — 160 — Investments of captive insurance company (b) 3 3 3 — — Foreign currency derivatives 4 4 — 4 — Total assets at fair value $ 1,113 $ 1,113 $ 949 $ 164 $ — Liabilities Foreign currency derivatives $ 13 $ 13 $ — $ 13 $ — (a) Included in restricted investments is $30 million classified in the other current assets caption on the Condensed Consolidated Balance Sheets. (b) Included in other noncurrent assets in the Condensed Consolidated Balance Sheets. The following table summarizes financial asset instruments subject to recurring fair value measurements as of September 30, 2017 . (In millions) Carrying value Total fair value Quoted prices in active markets for identical assets Level 1 Significant other observable inputs Level 2 Significant unobservable inputs Level 3 Assets Cash and cash equivalents $ 566 $ 566 $ 566 $ — $ — Restricted investments (a) 332 332 332 — — Deferred compensation investments (b) 158 158 — 158 — Investments of captive insurance company (b) 3 3 3 — — Foreign currency derivatives 2 2 — 2 — Total assets at fair value $ 1,061 $ 1,061 $ 901 $ 160 $ — Liabilities Foreign currency derivatives $ 36 $ 36 $ — $ 36 $ — (a) Included in restricted investments is $30 million classified in the other current assets caption on the Condensed Consolidated Balance Sheets. (b) Included in other noncurrent assets in the Condensed Consolidated Balance Sheets.
Available-for-sale Securities	The following table provides a summary of the available-for-sale securities portfolio as of December 31, 2017 and September 30, 2017 : December 31 September 30 (In millions) 2017 2017 Original cost $ 335 $ 335 Accumulated adjustments, net (a) (38 ) (24 ) Adjusted cost, beginning of year 297 311 Investment income (b) 2 9 Unrealized gain 45 35 Realized gain 1 2 Settlement funds 5 2 Disbursements (5 ) (27 ) Fair value $ 345 $ 332 (a) The accumulated adjustments include investment income, realized gains, disbursements and settlements recorded in previous periods. (b) Investment income for the demand deposit includes interest income as well as dividend income transferred from the equity and corporate bond mutual funds. The following table presents gross unrealized gains and losses for the restricted investment available-for-sale securities as of December 31, 2017 and September 30, 2017 : Gross Gross (In millions) Adjusted Cost Unrealized Gain Unrealized Loss Fair Value As of December 31, 2017 Demand Deposit $ 17 $ — $ — $ 17 Equity Mutual Fund 163 45 — 208 Corporate bond Mutual Fund 120 — — 120 Fair value $ 300 $ 45 $ — $ 345 As of September 30, 2017 Demand Deposit $ 9 $ — $ — $ 9 Equity Mutual Fund 168 34 — 202 Corporate bond Mutual Fund 120 1 — 121 Fair value $ 297 $ 35 $ — $ 332
Investment Income	The following table presents the investment income and disbursements related to the investments within the portfolio for the three months ended December 31, 2017 and 2016 . Three months ended December 31 (In millions) 2017 2016 Investment income $ 2 $ 3 Realized gains 1 — Disbursements (5 ) —
Summary of gains (losses) on foreign currency derivatives	The following table summarizes the net gains and/or losses recognized during the three months ended December 31, 2017 and 2016 within the Statements of Consolidated Comprehensive Income (Loss). Three months ended December 31 (In millions) 2017 2016 Foreign currency derivative loss $ (11 ) $ (8 )
Summary of fair values on foreign currency derivatives	The following table summarizes the fair values of the outstanding foreign currency derivatives as of December 31, 2017 and September 30, 2017 included in accounts receivable and accrued expenses and other liabilities of the Condensed Consolidated Balance Sheets. December 31 September 30 (In millions) 2017 2017 Foreign currency derivative assets $ 4 $ 2 Notional contract values 425 79 Foreign currency derivative liabilities $ 13 $ 36 Notional contract values 810 1,601

INVENTORIES (Tables)

INVENTORIES (Tables)	3 Months Ended
	Dec. 31, 2017
Inventory Disclosure [Abstract]
Inventories	The following table summarizes Ashland’s inventories as of the reported Condensed Consolidated Balance Sheet dates. December 31 September 30 (In millions) 2017 2017 Finished products $ 421 $ 390 Raw materials, supplies and work in process 256 245 LIFO reserves (3 ) (1 ) $ 674 $ 634

GOODWILL AND OTHER INTANGIBLE36

GOODWILL AND OTHER INTANGIBLES (Tables)	3 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill by Segment	The following is a progression of goodwill by reportable segment for the three months ended December 31, 2017 . Specialty Intermediates (In millions) Ingredients Composites and Solvents (a) Total Balance as of September 30, 2017 $ 2,315 $ 150 $ — $ 2,465 Currency translation adjustment 10 — — 10 Balance as of December 31, 2017 $ 2,325 $ 150 $ — $ 2,475 (a) As of December 31, 2017 , there was accumulated impairment of $171 million related to the Intermediates and Solvents reportable segment.
Intangible Assets	Intangible assets were comprised of the following as of December 31, 2017 and September 30, 2017 . December 31, 2017 Gross Net carrying Accumulated carrying (In millions) amount amortization amount Definite-lived intangible assets Trademarks and trade names $ 67 $ (22 ) $ 45 Intellectual property 758 (340 ) 418 Customer and supplier relationships 780 (246 ) 534 Total definite-lived intangible assets 1,605 (608 ) 997 Indefinite-lived intangible assets Trademarks and trade names 301 — 301 Total intangible assets $ 1,906 $ (608 ) $ 1,298 September 30, 2017 Gross Net carrying Accumulated carrying (In millions) amount amortization amount Definite-lived intangible assets Trademarks and trade names $ 67 $ (22 ) $ 45 Intellectual property 757 (326 ) 431 Customer and supplier relationships 777 (235 ) 542 Total definite-lived intangible assets 1,601 (583 ) 1,018 Indefinite-lived intangible assets Trademarks and trade names 301 — 301 Total intangible assets $ 1,902 $ (583 ) $ 1,319

DEBT (Tables)

DEBT (Tables)	3 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Summary of Debt	The following table summarizes Ashland’s current and long-term debt as of the dates reported in the Condensed Consolidated Balance Sheets. December 31 September 30 (In millions) 2017 2017 4.750% notes, due 2022 $ 1,082 $ 1,082 Term Loan B, due 2024 597 599 6.875% notes, due 2043 376 376 Revolving Credit Facility 285 173 Term Loan A, due 2022 250 250 Term Loan A, due 2020 250 250 Accounts receivable securitization 64 56 6.50% junior subordinated notes, due 2029 51 51 Medium-term notes, due 2019, interest of 9.4% at December 31, 2017 5 5 Other (a) (21 ) (23 ) Total debt 2,939 2,819 Short-term debt (includes current portion of long-term debt) (355 ) (235 ) Long-term debt (less current portion and debt issuance cost discounts) $ 2,584 $ 2,584 (a) Other includes $24 million and $25 million of debt issuance cost discounts as of December 31, 2017 and September 30, 2017 , respectively.

INCOME TAXES (Tables)

INCOME TAXES (Tables)	3 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Summary of Changes in Unrecognized Tax Benefits	Changes in unrecognized tax benefits are summarized as follows for the three months ended December 31, 2017 . (In millions) Balance at October 1, 2017 $ 194 Increases related to positions taken on items from prior years 2 Increases related to positions taken in the current year 3 Balance at December 31, 2017 $ 199

EMPLOYEE BENEFIT PLANS (Tables)

EMPLOYEE BENEFIT PLANS (Tables)	3 Months Ended
	Dec. 31, 2017
Compensation and Retirement Disclosure [Abstract]
Employee Benefit Plans	The following table details the components of pension and other postretirement benefit costs for continuing operations. Other postretirement Pension benefits benefits (In millions) 2017 2016 2017 2016 Three months ended December 31 Service cost (a) $ 2 $ 2 $ 1 $ — Interest cost (b) 3 2 — 1 Expected return on plan assets (b) (3 ) (3 ) — — Actuarial gain (b) — — — (2 ) Total net periodic benefit costs (income) $ 2 $ 1 $ 1 $ (1 ) (a) Service cost was not impacted by new accounting guidance adopted in the current quarter and is therefore still classified within the selling, general and administrative expense and cost of sales captions on the Statements of Consolidated Comprehensive Income (Loss). See Note A for additional information. (b) These components are now classified within the other net periodic benefit income caption on the Statements of Consolidated Comprehensive Income (Loss) due to the adoption of new accounting guidance in the current quarter. See Note A for additional information.

LITIGATION, CLAIMS AND CONTIN40

LITIGATION, CLAIMS AND CONTINGENCIES (Tables)	3 Months Ended
	Dec. 31, 2017
Loss Contingencies [Line Items]
Reconciliation of Changes in the Environmental Contingencies and Asset Retirement Obligations Reserve	The following table provides a reconciliation of the changes in the environmental remediation reserves during the three months ended December 31, 2017 and 2016 . Three months ended December 31 (In millions) 2017 2016 Reserve - beginning of period $ 163 $ 177 Disbursements (8 ) (7 ) Revised obligation estimates and accretion 13 4 Reserve - end of period $ 168 $ 174
Components of Environmental Remediation Expense	Components of environmental remediation expense included within the selling, general and administrative expense caption of the Statements of Consolidated Comprehensive Income are presented in the following table for the three months ended December 31, 2017 and 2016 . Three months ended December 31 (In millions) 2017 2016 Environmental expense $ 12 $ 4 Accretion 1 — Legal expense 1 2 Total expense 14 6 Insurance receivable (a) — — Total expense, net of receivable activity $ 14 $ 6 (a) Activity of $0 denotes value less than $1 million.
Ashland [Member]
Loss Contingencies [Line Items]
Summary of Asbestos Claims Activity	A summary of Ashland asbestos claims activity, excluding Hercules claims, follows. Three months ended December 31 Years ended September 30 (In thousands) 2017 2016 2017 2016 2015 Open claims - beginning of period 54 57 57 60 65 New claims filed 1 — 2 2 2 Claims settled — — (1 ) — — Claims dismissed (1 ) (1 ) (4 ) (5 ) (7 ) Open claims - end of period 54 56 54 57 60
Progression of Activity in the Asbestos Reserve Accounts	A progression of activity in the asbestos reserve is presented in the following table. Three months ended December 31 Years ended September 30 (In millions) 2017 2016 2017 2016 2015 Asbestos reserve - beginning of period $ 419 $ 415 $ 415 $ 409 $ 438 Reserve adjustment — — 36 37 — Amounts paid (10 ) (9 ) (32 ) (31 ) (29 ) Asbestos reserve - end of period (a) $ 409 $ 406 $ 419 $ 415 $ 409 (a) Included $34 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of December 31, 2017 and September 30, 2017 .
Progression of Insurance Receivable	A progression of activity in the Ashland insurance receivable is presented in the following table. Three months ended December 31 Years ended September 30 (In millions) 2017 2016 2017 2016 2015 Insurance receivable - beginning of period $ 155 $ 151 $ 151 $ 150 $ 402 Receivable adjustment — — 15 16 (3 ) Insurance settlement — — (5 ) (4 ) (227 ) Amounts collected (4 ) (2 ) (6 ) (11 ) (22 ) Insurance receivable - end of period (a) $ 151 $ 149 $ 155 $ 151 $ 150 (a) Included $14 million classified in accounts receivable on the Condensed Consolidated Balance Sheets as of December 31, 2017 and September 30, 2017 .
Hercules [Member]
Loss Contingencies [Line Items]
Summary of Asbestos Claims Activity	A summary of Hercules’ asbestos claims activity follows. Three months ended December 31 Years ended September 30 (In thousands) 2017 2016 2017 2016 2015 Open claims - beginning of period 12 15 15 20 21 New claims filed — — 1 1 1 Claims dismissed — — (4 ) (6 ) (2 ) Open claims - end of period 12 15 12 15 20
Progression of Activity in the Asbestos Reserve Accounts	A progression of activity in the asbestos reserve is presented in the following table. Three months ended December 31 Years ended September 30 (In millions) 2017 2016 2017 2016 2015 Asbestos reserve - beginning of period $ 323 $ 321 $ 321 $ 311 $ 329 Reserve adjustment — — 16 25 4 Amounts paid (8 ) (3 ) (14 ) (15 ) (22 ) Asbestos reserve - end of period (a) $ 315 $ 318 $ 323 $ 321 $ 311 (a) Included $14 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of December 31, 2017 and September 30, 2017 .
Progression of Insurance Receivable	A progression of activity in the Hercules insurance receivable is presented in the following table. Three months ended December 31 Years ended September 30 (In millions) 2017 2016 2017 2016 2015 Insurance receivable - beginning of period $ 68 $ 63 $ 63 $ 56 $ 77 Receivable adjustment — — 5 7 1 Insurance settlement — — — — (22 ) Insurance receivable - end of period $ 68 $ 63 $ 68 $ 63 $ 56

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	3 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Computation of Basic and Diluted Earnings per Share	The following is the computation of basic and diluted earnings per share (EPS) from continuing operations attributable to Ashland. Stock appreciation rights (SARs), stock options and warrants available to purchase shares outstanding for each reporting period whose grant price was greater than the average market price of Ashland Common Stock for each applicable period were not included in the computation of income from continuing operations per diluted share because the effect of these instruments would be antidilutive. The total number of these shares outstanding was approximately 0.7 million and 0.9 million at December 31, 2017 and 2016 , respectively. Earnings per share is reported under the treasury stock method. Three months ended December 31 (In millions except per share data) 2017 2016 Numerator Numerator for basic and diluted EPS – Loss from continuing operations $ (7 ) $ (65 ) Denominator Denominator for basic EPS – Weighted-average common shares outstanding 62 62 Share-based awards convertible to common shares (a) — — Denominator for diluted EPS – Adjusted weighted- average shares and assumed conversions 62 62 EPS from continuing operations attributable to Ashland Basic $ (0.12 ) $ (1.05 ) Diluted (0.12 ) (1.05 ) (a) As a result of the loss from continuing operations attributable to Ashland during the three months ended December 31, 2017 and 2016, the effect of the share-based awards convertible to common shares would be antidilutive. In accordance with U.S. GAAP, they have been excluded from the diluted EPS calculation.

EQUITY ITEMS (Tables)

EQUITY ITEMS (Tables)	3 Months Ended
	Dec. 31, 2017
Equity [Abstract]
Schedule of Comprehensive Income (Loss) [Table Text Block]	Components of other comprehensive income (loss) recorded in the Statements of Consolidated Comprehensive Income (Loss) are presented below, before tax and net of tax effects. 2017 2016 Tax Tax Before (expense) Net of Before (expense) Net of (In millions) tax benefit tax tax benefit tax Three months ended December 31 Other comprehensive income (loss) Unrealized translation gain (loss) $ 3 $ — $ 3 $ (150 ) $ 4 $ (146 ) Pension and postretirement obligation adjustment: Amortization of unrecognized prior service credits included in net income (a) — — — (3 ) 2 (1 ) Net change in available-for-sale securities: Unrealized gains during period 11 (2 ) 9 — — — Reclassification adjustment for realized gains included in net income (1 ) — (1 ) — — — Total other comprehensive income (loss) $ 13 $ (2 ) $ 11 $ (153 ) $ 6 $ (147 ) (a) For the three months ended December 31, 2016, the amortization of unrecognized prior service credits was related to pension and other postretirement benefit plans that transferred to Valvoline and was classified in the discontinued operations caption on the Statements of Consolidated Comprehensive Income (Loss).

STOCK INCENTIVE PLANS Stock Inc

STOCK INCENTIVE PLANS Stock Incentive Plans (Tables)	3 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]	The components of Ashland’s pretax stock-based compensation expense included in continuing operations are as follows: Three months ended December 31 (In millions) 2017 (a) 2016 (b) SARs $ 1 $ 1 Nonvested stock awards 6 4 Performance awards 4 2 $ 11 $ 7 (a) The three months ended December 31, 2017 included $2 million of expense related to cash-settled nonvested restricted stock awards and $2 million of expense related to cash-settled performance units. (b) The three months ended December 31, 2016 included $1 million of expense related to cash-settled nonvested restricted stock awards and $1 million of expense related to cash-settled performance units.

REPORTABLE SEGMENT INFORMATIO44

REPORTABLE SEGMENT INFORMATION (Tables)	3 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Reportable Segment Information	The following table presents various financial information for each reportable segment for the three months ended December 31, 2017 and 2016 . Three months ended December 31 (In millions - unaudited) 2017 2016 SALES Specialty Ingredients $ 550 $ 482 Composites 218 165 Intermediates and Solvents 74 57 $ 842 $ 704 OPERATING INCOME (LOSS) Specialty Ingredients $ 42 $ 40 Composites 18 15 Intermediates and Solvents 8 (7 ) Unallocated and other (29 ) (33 ) $ 39 $ 15

SIGNIFICANT ACCOUNTING POLICI45

SIGNIFICANT ACCOUNTING POLICIES (Details) shares in Millions, $ in Millions	3 Months Ended		7 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	May 12, 2017shares
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Valvoline Shares Owned by Ashland | shares			170
Sale of Stock, Percentage of Ownership after Transaction			83.00%
Number of reportable segments	3
Other net periodic benefit income | $	$ 0	$ 2

VALVOLINE (Details)

VALVOLINE (Details) - USD ($) shares in Millions, $ in Millions		3 Months Ended		7 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	May 12, 2017	Sep. 30, 2017	May 17, 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%
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners							17.00%
Stockholders' Equity Note, Stock Split, Conversion Ratio				2.745338
Accounts receivable, net	[1]	$ 597			$ 612
Inventories		674			634
Other current assets		92			91
Total current assets		1,964			1,903
Net property, plant and equipment		1,945			1,970
Goodwill		2,475			2,465	$ 287
Deferred income taxes		28			28
Other noncurrent assets		425			422
Total noncurrent assets		6,691			6,715
Total assets		8,655			8,618
Short-term debt		355			235
Trade and other payables		382			409
Other current liabilities		266			324
Total current liabilities		1,003			968
Long-term debt		2,584			2,584
Employee benefit obligations		194			191
Other long-term liabilities		409			400
Total noncurrent liabilities		4,253			$ 4,244
Selling, General and Administrative Expenses [Member]
Distribution of Valvoline [Line Items]
Separation costs		$ 6	$ 28
Discontinued Operations [Member]
Distribution of Valvoline [Line Items]
Separation costs			$ 6
Valvoline [Member]
Distribution of Valvoline [Line Items]
Cash Equivalents, at Carrying Value				$ 179
Accounts receivable, net				385
Inventories				153
Other current assets				24
Total current assets				741
Net property, plant and equipment				357
Goodwill				329
Equity and other unconsolidated investments				31
Deferred income taxes				391
Other noncurrent assets				93
Total noncurrent assets				1,201
Total assets				1,942
Short-term debt				75
Current portion of long-term debt				16
Trade and other payables				353
Other current liabilities				34
Total current liabilities				478
Long-term debt				662
Employee benefit obligations				826
Other long-term liabilities				163
Total noncurrent liabilities				1,651
Total liabilities				2,129
Net deficit				$ (187)
[1]	Accounts receivable includes an allowance for doubtful accounts of $9 million at December 31, 2017 and September 30, 2017

ACQUISITIONS (Details)

ACQUISITIONS (Details) $ in Millions	May 17, 2017USD ($)	Sep. 30, 2016USD ($)	Dec. 31, 2017USD ($)	Sep. 30, 2017USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period		$ 300
Number of manufacturing facilities	14
Business acquisiton, purchase price	$ 680
Working capital adjustments	20
Accounts receivable	52
Inventory	74
Other current assets	4
Intangible assets	330
Goodwill	287		$ 2,475	$ 2,465
Property, plant and equipment	97
Other noncurrent assets	20
Accounts payable	(32)
Deferred tax - net	(138)
Other noncurrent liabilities	(14)
Trademarks and Trade Names [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Finite-lived Intangible Assets Acquired	$ 26
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	15 years
Intellectual Property [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Finite-lived Intangible Assets Acquired	$ 68
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	22 years
Customer and supplier relationships [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Finite-lived Intangible Assets Acquired	$ 236
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	20 years

DISCONTINUED OPERATIONS (Detail

DISCONTINUED OPERATIONS (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		7 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	May 12, 2017
Discontinued Operations [Line Items]
Valvoline Shares Owned by Ashland			170
Income from discontinued operations (net of tax)	$ 3	$ 75
Research and development expense	21	20
Income tax expense	14	(41)
Valvoline [Member]
Discontinued Operations [Line Items]
Income from discontinued operations (net of tax)	$ 3	75
Sales		489
Cost of sales		(293)
Selling, general and administrative expense		(82)
Research and development expense		(3)
Equity and other income		9
Operating income of discontinued operations		120
Net interest and other financing expense		(10)
Pretax income of discontinued operations		110
Income tax expense		$ (35)

FAIR VALUE MEASUREMENTS (Recurr

FAIR VALUE MEASUREMENTS (Recurring Basis) (Details) - USD ($) $ in Millions		Dec. 31, 2017	Sep. 30, 2017
ASSETS
Restricted Investments, Current		$ 30	$ 30
Fair Value, Measurements, Recurring [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
ASSETS
Cash and cash equivalents		601	566
Restricted investments	[1]	345	332
Deferred compensation investments	[2]	160	158
Investments of captive insurance company	[2]	3	3
Foreign currency derivatives		4	2
Total assets at fair value		1,113	1,061
LIABILITIES
Foreign currency derivatives		13	36
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
ASSETS
Cash and cash equivalents		601	566
Restricted investments	[1]	345	332
Deferred compensation investments	[2]	160	158
Investments of captive insurance company	[2]	3	3
Foreign currency derivatives		4	2
Total assets at fair value		1,113	1,061
LIABILITIES
Foreign currency derivatives		13	36
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
ASSETS
Cash and cash equivalents		601	566
Restricted investments	[1]	345	332
Deferred compensation investments	[2]	0	0
Investments of captive insurance company	[2]	3	3
Foreign currency derivatives		0	0
Total assets at fair value		949	901
LIABILITIES
Foreign currency derivatives		0	0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
ASSETS
Cash and cash equivalents		0	0
Restricted investments	[1]	0	0
Deferred compensation investments	[2]	160	158
Investments of captive insurance company	[2]	0	0
Foreign currency derivatives		4	2
Total assets at fair value		164	160
LIABILITIES
Foreign currency derivatives		13	36
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
ASSETS
Cash and cash equivalents		0	0
Restricted investments	[1]	0	0
Deferred compensation investments	[2]	0	0
Investments of captive insurance company	[2]	0	0
Foreign currency derivatives		0	0
Total assets at fair value		0	0
LIABILITIES
Foreign currency derivatives		$ 0	$ 0
[1]	Included in restricted investments is $30 million classified in the other current assets caption on the Condensed Consolidated Balance Sheets.
[2]	Included in other noncurrent assets in the Condensed Consolidated Balance Sheets.

FAIR VALUE MEASUREMENTS (Availa

FAIR VALUE MEASUREMENTS (Available-for-sale Securities) (Details) - USD ($) $ in Millions		3 Months Ended				12 Months Ended
		Dec. 31, 2017		Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2017		Sep. 30, 2015
Schedule of Available-for-sale Securities [Line Items]
Litigation Settlement, Amount								$ 398
Increase (Decrease) in Restricted Cash								$ 335
Restricted Investments, Current		$ 30		$ 30		$ 30
Original cost		335		335		335
Accumulated investment income, settlement funds and disbursements, net		(38)		(24)		(24)
Adjusted cost	[1]	297		311		311
Investment income		2	[2]		$ 3	9	[2]
Unrealized gain		45		35		35
Realized gains		1			0	2
Settlement funds		5				2
Disbursements		(5)			$ 0	(27)
Total, fair value		345		332		332
Equity mutual fund, unrealized loss		0		0		0
Corporate bond mutual fund, unrealized loss				0		0
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities		0		0
Demand Deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Demand Deposit		17		9		9
Equity mutual fund [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted cost		163		168		168
Equity mutual fund, unrealized gain		45		34		34
Equity mutual fund, Fair value		208		202		202
Corporate bond mutual fund [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted cost		120		120		120
Corporate bond mutual fund, unrealized gain		0		1		1
Corporate bond mutual fund, unrealized loss		0
Corporate bond mutual fund, Fair value		120		121		121
Available-for-sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted cost		300		297		297
Unrealized gain		45		35		35
Unrealized loss		0		0		0
Total, fair value		$ 345		$ 332		$ 332
[1]	The accumulated adjustments include investment income, realized gains, disbursements and settlements recorded in previous periods.
[2]	Investment income for the demand deposit includes interest income as well as dividend income transferred from the equity and corporate bond mutual funds.

FAIR VALUE MEASUREMENTS (Curren

FAIR VALUE MEASUREMENTS (Currency Hedges) (Details) - Foreign Exchange Contract [Member] - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2017
Accounts Receivable [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency derivative assets	$ 4		$ 2
Notional amounts, foreign currency derivatives	425		79
Accrued Expenses and Other Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency derivative liabilities	13		36
Notional amounts, foreign currency derivatives	810		$ 1,601
Not Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency derivative gain (loss)	$ (11)	$ (8)

FAIR VALUE MEASUREMENTS (Other

FAIR VALUE MEASUREMENTS (Other Financial Instruments) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Sep. 30, 2017
Other financial instruments [Abstract]
Long-term Debt, Carrying Value	$ 2,614	$ 2,615
Long-term Debt, Fair Value	$ 2,755	$ 2,768

INVENTORIES (Details)

INVENTORIES (Details) - USD ($) $ in Millions	Dec. 31, 2017	Sep. 30, 2017
Inventory Disclosure [Abstract]
Finished products	$ 421	$ 390
Raw materials, supplies and work in process	256	245
LIFO reserve	(3)	(1)
Inventory, Net	$ 674	$ 634

GOODWILL AND OTHER INTANGIBLE54

GOODWILL AND OTHER INTANGIBLES (Goodwill) (Details) $ in Millions	3 Months Ended
	Dec. 31, 2017USD ($)
Goodwill [Roll Forward]
Balance at beginning of period	$ 2,465
Currency translation adjustment	10
Balance at end of period	2,475
Specialty Ingredients [Member]
Goodwill [Roll Forward]
Balance at beginning of period	2,315
Currency translation adjustment	10
Balance at end of period	2,325
Composites [Member]
Goodwill [Roll Forward]
Balance at beginning of period	150
Currency translation adjustment	0
Balance at end of period	150
Intermediates and Solvents [Member]
Goodwill [Roll Forward]
Balance at beginning of period	0
Currency translation adjustment	0
Balance at end of period	0	[1]
Goodwill, Impaired, Accumulated Impairment Loss	$ 171
[1]	As of December 31, 2017, there was accumulated impairment of $171 million related to the Intermediates and Solvents reportable segment.

GOODWILL AND OTHER INTANGIBLE55

GOODWILL AND OTHER INTANGIBLES (Other Intangible Assets) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2017
Intangible Assets, Net [Abstract]
Intangible Assets, Gross (Excluding Goodwill)	$ 1,906		$ 1,902
Intangibles	1,298		1,319
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	1,605		1,601
Accumulated amortization	(608)		(583)
Net carrying amount	997		1,018
Amortization expense recognized on intangible assets	24	$ 19
Expected future amortization expense [Abstract]
2018 (includes three months actual and nine months estimated)	94
2,019	90
2,020	89
2,021	89
2,022	87
Trademarks and Trade Names [Member]
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
Indefinite-lived intangible assets (excluding goodwill)	301		301
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	67		67
Accumulated amortization	(22)		(22)
Net carrying amount	45		45
Intellectual Property [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	758		757
Accumulated amortization	(340)		(326)
Net carrying amount	418		431
Customer and supplier relationships [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	780		777
Accumulated amortization	(246)		(235)
Net carrying amount	$ 534		$ 542
Minimum [Member] | Trademarks and Trade Names [Member]
Intangible Assets, Net [Abstract]
Useful life (in years)	3 years
Minimum [Member] | Intellectual Property [Member]
Intangible Assets, Net [Abstract]
Useful life (in years)	5 years
Minimum [Member] | Customer and supplier relationships [Member]
Intangible Assets, Net [Abstract]
Useful life (in years)	3 years
Maximum [Member] | Trademarks and Trade Names [Member]
Intangible Assets, Net [Abstract]
Useful life (in years)	25 years
Maximum [Member] | Intellectual Property [Member]
Intangible Assets, Net [Abstract]
Useful life (in years)	25 years
Maximum [Member] | Customer and supplier relationships [Member]
Intangible Assets, Net [Abstract]
Useful life (in years)	24 years

DEBT (Schedule of Long-term Deb

DEBT (Schedule of Long-term Debt) (Details) - USD ($) $ in Millions		3 Months Ended
		Dec. 31, 2017	Sep. 30, 2017
Debt Instrument [Line Items]
Total debt		$ 2,939	$ 2,819
Short-term debt		(355)	(235)
Long-term debt		2,584	2,584
Unamortized Debt Issuance Expense, Long-Term Debt		24	25
Scheduled aggregate debt maturities by fiscal year [Abstract]
2,018		5
2,019		11
2,020		269
2,021		56
2,022		1,279
Notes due 2022 [Member]
Debt Instrument [Line Items]
Total debt		$ 1,082	1,082
Debt Instrument, Interest Rate, Stated Percentage		4.75%
Debt Instrument, Maturity Date		Aug. 15, 2022
Term Loan B due 2024 [Member]
Debt Instrument [Line Items]
Total debt		$ 597	599
Notes due 2043 [Member]
Debt Instrument [Line Items]
Total debt		$ 376	376
Debt Instrument, Interest Rate, Stated Percentage		6.875%
Debt Instrument, Maturity Date		May 15, 2043
2017 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total debt		$ 285	173
Term Loan A due 2022 [Member]
Debt Instrument [Line Items]
Total debt		250	250
Term Loan A due 2020 [Member]
Debt Instrument [Line Items]
Total debt		250	250
Accounts Receivable Securitization [Member]
Debt Instrument [Line Items]
Total debt		64	56
Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Total debt		$ 51	51
Debt Instrument, Interest Rate, Stated Percentage		6.50%
Debt Instrument, Maturity Date		Dec. 31, 2029
Medium-term Notes [Member]
Debt Instrument [Line Items]
Total debt		$ 5	5
Debt Instrument, Interest Rate, Stated Percentage		9.40%
Debt Instrument, Maturity Date		Dec. 31, 2019
Other Notes [Member]
Debt Instrument [Line Items]
Total debt	[1]	$ (21)	$ (23)
[1]	Other includes $24 million and $25 million of debt issuance cost discounts as of December 31, 2017 and September 30, 2017, respectively.

DEBT (Financing Activity and Co

DEBT (Financing Activity and Covenants) (Details) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2016USD ($)	Sep. 30, 2017USD ($)	Dec. 31, 2017USD ($)	May 17, 2017USD ($)
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity			$ 498
Debt instrument, outstanding amount		$ 2,819	$ 2,939
Covenant restrictions [Abstract]
Maximum consolidated leverage ratio			4.50
Calculated leverage ratio			3.9
Minimum required consolidated interest coverage ratio			3
Calculated consolidated interest coverage ratio			4.6
Term Loan A due 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 250
Debt instrument, outstanding amount		250	250
Term Loan A due 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			250
Debt instrument, outstanding amount		$ 250	250
2017 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			800	$ 680
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.25%
Line of credit facility, letter of credit sublimit			125
Line of Credit Facility, Remaining Borrowing Capacity			467
Letters of Credit Outstanding, Amount			48
Debt instrument, outstanding amount		$ 173	285
Term Loan B due 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			600
Debt instrument, outstanding amount		599	$ 597
Notes due 2022 [Member]
Debt Instrument [Line Items]
Repayments of Debt	$ 36
Debt Instrument, Interest Rate, Stated Percentage			4.75%
Debt instrument, outstanding amount		1,082	$ 1,082
Notes due 2018 [Member]
Debt Instrument [Line Items]
Repayments of Debt	29
Debt Instrument, Interest Rate, Stated Percentage			3.875%
Notes due 2018 and 2022 [Member]
Debt Instrument [Line Items]
Gain (Loss) on Repurchase of Debt Instrument	(2)
Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Aggregate purchase price of debt	177
Repayment of debt, accelerated accretion	92
Par value of debt repurchases	182
Reduction in carrying value of debt	90
Gain (Loss) on Repurchase of Debt Instrument	$ 5
Debt Instrument, Interest Rate, Stated Percentage			6.50%
Debt instrument, outstanding amount		51	$ 51
Accounts Receivable Securitization [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity			31
Debt instrument, outstanding amount		$ 56	$ 64
London Interbank Offered Rate (LIBOR) [Member] | 2017 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instruments, percentage points added to variable rate			1.75%
Alternate base rate [Member] | 2017 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instruments, percentage points added to variable rate		0.75%
Minimum [Member] | 2017 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.175%
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | 2017 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instruments, percentage points added to variable rate		1.375%
Minimum [Member] | Alternate base rate [Member] | 2017 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instruments, percentage points added to variable rate		0.375%
Maximum [Member] | 2017 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.40%
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | 2017 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instruments, percentage points added to variable rate		2.50%
Maximum [Member] | Alternate base rate [Member] | 2017 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instruments, percentage points added to variable rate		1.50%

INCOME TAXES (Effective Tax Rat

INCOME TAXES (Effective Tax Rate) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	35.00%
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount	$ 16
Increase (Decrease) in Deferred Income Taxes	126
Increase (Decrease) in Deferred Liabilities	$ 142
Effective tax rate (in hundredths)	200.00%	39.00%

INCOME TAXES (Unrecognized Tax

INCOME TAXES (Unrecognized Tax Benefits) (Details) $ in Millions	3 Months Ended
	Dec. 31, 2017USD ($)
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance	$ 194
Increases related to positions taken on items from prior years	2
Increases related to positions taken in the current year	3
Balance	199
Minimum [Member]
Income Tax Contingency [Line Items]
Decrease in Unrecognized Tax Benefits is Reasonably Possible	22
Maximum [Member]
Income Tax Contingency [Line Items]
Decrease in Unrecognized Tax Benefits is Reasonably Possible	$ 32

EMPLOYEE BENEFIT PLANS (Details

EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Millions		3 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Actuarial gain		$ 0	$ 2
Total net periodic benefit cost		0	(2)
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual contributions to benefit plans in period		0
Estimated future contributions in current fiscal year		1
Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual contributions to benefit plans in period		2
Estimated future contributions in current fiscal year		5
Pension Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	[1]	2	2
Interest cost	[2]	3	2
Expected return on plan assets	[2]	(3)	(3)
Actuarial gain	[2]	0	0
Total net periodic benefit cost		2	1
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	[1]	1	0
Interest cost	[2]	0	1
Expected return on plan assets	[2]	0	0
Actuarial gain	[2]	0	(2)
Total net periodic benefit cost		$ 1	$ (1)
[1]	Service cost was not impacted by new accounting guidance adopted in the current quarter and is therefore still classified within the selling, general and administrative expense and cost of sales captions on the Statements of Consolidated Comprehensive Income (Loss). See Note A for additional information.
[2]	These components are now classified within the other net periodic benefit income caption on the Statements of Consolidated Comprehensive Income (Loss) due to the adoption of new accounting guidance in the current quarter. See Note A for additional information.

LITIGATION, CLAIMS AND CONTIN61

LITIGATION, CLAIMS AND CONTINGENCIES (Asbestos Litigation) (Details) claim in Thousands, $ in Millions	3 Months Ended			12 Months Ended
	Dec. 31, 2017USD ($)claim		Dec. 31, 2016USD ($)claim	Sep. 30, 2017USD ($)claim		Sep. 30, 2016USD ($)claim	Sep. 30, 2015USD ($)claim
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]
Insurance settlement	$ 0		$ 0
Minimum [Member]
Asbestos litigation cost projection [Abstract]
Number of Years Included in Asbestos Assumption	40 years
Maximum [Member]
Asbestos litigation cost projection [Abstract]
Number of Years Included in Asbestos Assumption	50 years
Ashland [Member]
Asbestos claims [Roll Forward]
Open claims - beginning of period | claim	54		57	57		60	65
New claims filed | claim	1		0	2		2	2
Claims settled | claim	0		0	(1)		0	0
Claims dismissed | claim	(1)		(1)	(4)		(5)	(7)
Open claims - end of period | claim	54		56	54		57	60
Asbestos reserve [Roll Forward]
Asbestos reserve - beginning of period	$ 419	[1]	$ 415	$ 415		$ 409	$ 438
Reserve adjustment	0		0	36		37	0
Amounts paid	(10)		(9)	(32)		(31)	(29)
Asbestos reserve - end of period	409	[1]	406	419	[1]	415	409
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]
Insurance receivable - beginning of period	155	[2]	151	151		150	402
Receivable adjustment	0		0	15		16	(3)
Insurance settlement	0		0	(5)		(4)	(227)
Amounts collected	(4)		(2)	(6)		(11)	(22)
Insurance receivable - end of period	151	[2]	$ 149	$ 155	[2]	$ 151	$ 150
Asbestos litigation cost projection [Abstract]
Possible total future litigation defense and claim settlement costs	$ 660
Hercules [Member]
Asbestos claims [Roll Forward]
Open claims - beginning of period | claim	12		15	15		20	21
New claims filed | claim	0		0	1		1	1
Claims dismissed | claim	0		0	(4)		(6)	(2)
Open claims - end of period | claim	12		15	12		15	20
Asbestos reserve [Roll Forward]
Asbestos reserve - beginning of period	$ 323	[3]	$ 321	$ 321		$ 311	$ 329
Reserve adjustment	0		0	16		25	4
Amounts paid	(8)		(3)	(14)		(15)	(22)
Asbestos reserve - end of period	315	[3]	318	323	[3]	321	311
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]
Insurance receivable - beginning of period	68		63	63		56	77
Receivable adjustment	0		0	5		7	1
Insurance settlement	0		0	0		0	(22)
Insurance receivable - end of period	68		$ 63	68		$ 63	$ 56
Asbestos litigation cost projection [Abstract]
Possible total future litigation defense and claim settlement costs	510
Other Current Liabilities [Member] | Ashland [Member]
Asbestos reserve [Roll Forward]
Asbestos reserve - beginning of period	34
Asbestos reserve - end of period	34			34
Other Current Liabilities [Member] | Hercules [Member]
Asbestos reserve [Roll Forward]
Asbestos reserve - beginning of period	14
Asbestos reserve - end of period	14			14
Accounts Receivable [Member] | Ashland [Member]
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]
Insurance receivable - beginning of period	14
Insurance receivable - end of period	$ 14			$ 14
[1]	Included $34 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of December 31, 2017 and September 30, 2017.
[2]	Included $14 million classified in accounts receivable on the Condensed Consolidated Balance Sheets as of December 31, 2017 and September 30, 2017.
[3]	Included $14 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of December 31, 2017 and September 30, 2017.

LITIGATION, CLAIMS AND CONTIN62

LITIGATION, CLAIMS AND CONTINGENCIES (Environmental Remediation and Asset Retirement Obligations) (Details) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2017USD ($)service_station_propertydisposal_sitewaste_treatment_or_disposal_sites	Dec. 31, 2016USD ($)	Sep. 30, 2017USD ($)
Environmental contingencies and asset retirement obligation [Roll Forward]
Environmental remediation reserve - beginning of period	$ 163	$ 177	$ 177
Disbursements	(8)	(7)
Revised obligation estimates and accretion	13	4
Environmental remediation reserve - end of period	168	174	163
Accrued Environmental Loss Contingencies, Noncurrent	125		121
Recorded Third-Party Environmental Recoveries Receivables	14		15
Recorded Third-Party Environmental Recoveries, Noncurrent	$ 13		$ 14
Environmental Remediation Costs Recognized [Abstract]
Number of waste treatment or disposal sites were company is identified as a potentially responsible party under the superfund or similar state laws | waste_treatment_or_disposal_sites	82
Number of current and former operating facilities subject to various environmental laws. | disposal_site	118
Total number of service station properties subject to various environmental laws | service_station_property	1,225
Number of service stations being actively remediated | service_station_property	36
Environmental expense	$ 14	6
Accretion Expense	1	0
Legal Fees	1	2
Insurance receivable	0	0
Total environmental remediation expense, net of receivable activity	14	6
Site Contingency [Line Items]
Environmental Expense	$ 12	$ 4
Maximum reserve for remediation reserve related to any one site (in hundredths)	15.00%
Maximum [Member]
Site Contingency [Line Items]
Environmental Exit Costs, Reasonably Possible Additional Loss	$ 412

EARNINGS PER SHARE (Details)

EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Antidilutive securities excluded from calculation of earnings per share		0.7	0.9
Numerator [Abstract]
Numerator for basic and diluted EPS - Loss from continuing operations		$ (7)	$ (65)
Denominator [Abstract]
Denominator for basic EPS - Weighted-average common shares outstanding		62	62
Share based awards convertible to common shares	[1]	0	0
Denominator for diluted EPS - Adjusted weighted-average shares and assumed conversions		62	62
EPS from continuing operations [Abstract]
Basic (in usd per share)		$ (0.12)	$ (1.05)
Diluted (in usd per share)		$ (0.12)	$ (1.05)
[1]	As a result of the loss from continuing operations attributable to Ashland during the three months ended December 31, 2017 and 2016, the effect of the share-based awards convertible to common shares would be antidilutive. In accordance with U.S. GAAP, they have been excluded from the diluted EPS calculation.

EQUITY ITEMS Stock Repurchase P

EQUITY ITEMS Stock Repurchase Programs and Stockholder Dividends (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2015
Accelerated Share Repurchases [Line Items]
Stock Repurchase Program, Authorized Amount						$ 1,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 500
Common Stock, Dividends, Per Share, Declared	$ 0.225	$ 0.225	$ 0.225	$ 0.390	$ 0.39

EQUITY ITEMS Accumulated Other

EQUITY ITEMS Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Equity [Abstract]
Unrealized translation gain (loss), before tax	$ 3	$ (150)
Unrealized translation gain (loss), tax	0	4
Unrealized translation gain (loss), net of tax	3	(146)
Amortization of unrecognized prior service credits included in net income, before tax	0	(3)	[1]
Amortization of unrecognized prior service credits included in net income, tax	0	2
Amortization of unrecognized prior service credits included in net income, net of tax	0	(1)
Unrealized gain on available-for-sale securities, before taxes	11	0
Unrealized gain on available-for-sale securities, tax	(2)	0
Unrealized gain on available-for-sale securities, net of tax	9	0
Reclassification adjustment for gains on available-for-sale securities included in net income, before tax	(1)	0
Reclassification adjustment for gains on available-for-sale securities included in net income, tax	0	0
Reclassification adjustment for gains on available-for-sale securities included in net income, net of tax	(1)	0
Other comprehensive income (loss), before tax	13	(153)
Other comprehensive income (loss), tax	(2)	6
Other comprehensive income (loss)	$ 11	$ (147)
[1]	For the three months ended December 31, 2016, the amortization of unrecognized prior service credits was related to pension and other postretirement benefit plans that transferred to Valvoline and was classified in the discontinued operations caption on the Statements of Consolidated Comprehensive Income (Loss).

STOCK INCENTIVE PLANS (Details)

STOCK INCENTIVE PLANS (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2017		Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 11	[1]	$ 7	[2]
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 1		$ 1
Unexercised SARs lapse expiration period	10 years 1 month
Grants of share-based payment awards in period	470,000		422,000
Total unrecognized compensation costs	$ 13
Model to fair value share-based payment awards	Black-Scholes option-pricing model
Unrecognized cost expected to be recognized over a weighted-average period (in years)	2 years 4 months 24 days
Stock Appreciation Rights (SARs) [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of share-based payment award	1 year
Stock Appreciation Rights (SARs) [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of share-based payment award	3 years
Nonvested Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 6		$ 4
Grants of share-based payment awards in period	142,000		81,000
Total unrecognized compensation costs	$ 12
Unrecognized cost expected to be recognized over a weighted-average period (in years)	2 years
Nonvested Stock Awards [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of share-based payment award	1 year
Nonvested Stock Awards [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of share-based payment award	5 years
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 4		$ 2
Vesting period of share-based payment award	3 years
Grants of share-based payment awards in period	101,000		56,000
Total unrecognized compensation costs	$ 17
Unrecognized cost expected to be recognized over a weighted-average period (in years)	2 years 2 months 12 days
Number of common shares for each converted performance share	1
Cash-settled Nonvested Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 2		$ 1
Vesting period of share-based payment award	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	220,000
Cash-settled Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 2		$ 1
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	2
Total unrecognized compensation costs	$ 8
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	60,000
[1]	The three months ended December 31, 2017 included $2 million of expense related to cash-settled nonvested restricted stock awards and $2 million of expense related to cash-settled performance units.
[2]	The three months ended December 31, 2016 included $1 million of expense related to cash-settled nonvested restricted stock awards and $1 million of expense related to cash-settled performance units.

REPORTABLE SEGMENT INFORMATIO67

REPORTABLE SEGMENT INFORMATION (Details) $ in Millions	3 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	May 17, 2017
Segment Reporting Information [Line Items]
Number of reportable segments	3
Number of manufacturing facilities			14
Sales	$ 842	$ 704
Operating income (loss)	39	15
Specialty Ingredients [Member]
Segment Reporting Information [Line Items]
Sales	550	482
Operating income (loss)	42	40
Composites [Member]
Segment Reporting Information [Line Items]
Sales	218	165
Operating income (loss)	18	15
Intermediates and Solvents [Member]
Segment Reporting Information [Line Items]
Sales	74	57
Operating income (loss)	8	(7)
Unallocated and other [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	$ (29)	$ (33)