Ashland 10-Q 28 Jan 15 2015 Q1 Quarterly report Financial data

Document_And_Entity_Informatio

Document And Entity Information (USD $)	3 Months Ended
	Dec. 31, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	ASHLAND INC.
Entity Central Index Key	1305014
Current Fiscal Year End Date	-21
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float	$8,295,134,005
Entity Common Stock, Shares Outstanding	69,264,646
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Document Type	10-Q
Amendment Flag	FALSE
Document Period End Date	31-Dec-14

STATEMENTS_OF_CONSOLIDATED_COM

STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME (unaudited) (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Sales	$1,391	$1,432
Cost of sales	982	1,048
Gross profit	409	384
Selling, general and administrative expense	226	235
Research and development expense	25	27
Equity and other income	11	21
Operating income	169	143
Net interest and other financing expense	41	42
Net gain (loss) on divestitures	-85	5
Income from continuing operations before income taxes	43	106
Income tax expense - Note I	3	18
Income from continuing operations	40	88
Income (loss) from discontinued operations (net of tax) - Note C	-8	22
Net income	32	110
BASIC EARNINGS PER SHARE - Note L
Income from continuing operations (in usd per share)	$0.58	$1.14
Income (loss) from discontinued operations (in usd per share)	($0.11)	$0.28
Net income (in usd per share)	$0.47	$1.42
DILUTED EARNINGS PER SHARE - Note L
Income from continuing operations (in usd per share)	$0.57	$1.12
Income (loss) from discontinued operations (in usd per share)	($0.11)	$0.28
Net income (in usd per share)	$0.46	$1.40
DIVIDENDS PAID PER COMMON SHARE (in usd per share)	$0.34	$0.34
COMPREHENSIVE INCOME (LOSS)
Net income	32	110
Other comprehensive income (loss), net of tax - Note M
Unrealized translation gain (loss)	-127	39
Pension and postretirement obligation adjustment	-5	-4
Other comprehensive income (loss)	-132	35
Comprehensive income (loss)	($100)	$145

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (USD $)	Dec. 31, 2014		Sep. 30, 2014
In Millions, unless otherwise specified
CURRENT ASSETS
Cash and cash equivalents	$1,256		$1,393
Accounts receivable	1,032	[1]	1,202	[1]
Inventories - Note F	746		765
Deferred income taxes	118		118
Other assets	89		83
Total current assets	3,241		3,561
PROPERTY, PLANT AND EQUIPMENT
Cost	4,118		4,275
Accumulated depreciation	1,865		1,861
Net property, plant and equipment	2,253		2,414
Goodwill - Note G	2,586		2,643
Intangibles - Note G	1,254		1,309
Asbestos insurance receivable - Note K	423		433
Equity and other unconsolidated investments	81		81
Other assets	511		510
Total noncurrent assets	7,108		7,390
Total assets	10,349		10,951
CURRENT LIABILITIES
Short-term debt - Note H	323		329
Current portion of long-term debt - Note H	9		9
Trade and other payables	529		674
Accrued expenses and other liabilities	513		675
Total current liabilities	1,374		1,687
NONCURRENT LIABILITIES
Long-term debt - Note H	2,943		2,942
Employee benefit obligations - Note J	1,449		1,468
Asbestos litigation reserve - Note K	690		701
Deferred income taxes	95		110
Other liabilities	473		460
Total noncurrent liabilities	5,650		5,681
Commitments and contingencies - Note K
Stockholders' equity	3,325		3,583
Total liabilities and stockholders' equity	$10,349		$10,951
[1]	Accounts receivable includes an allowance for doubtful accounts of $12 million and $13 million at December 31, 2014 and September 30, 2014, respectively.

CONDENSED_CONSOLIDATED_BALANCE1

CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) (USD $)	Dec. 31, 2014	Sep. 30, 2014
In Millions, unless otherwise specified
CURRENT ASSETS
Allowance for doubtful accounts	$12	$13

STATEMENT_OF_CONSOLIDATED_STOC

STATEMENT OF CONSOLIDATED STOCKHOLDERS' EQUITY (unaudited) (USD $)		Total	Common stock [Member]	Paid-in capital [Member]	Retained earnings [Member]	Accumulated other comprehensive income (loss) [Member]
In Millions
Beginning Balance at Sep. 30, 2014		$3,583	$1	$0	$3,475	$107	[1]
Total comprehensive income (loss)		-100			32	-132	[1]
Regular dividends, $.34 per common share		-24			-24
Common shares issued under stock incentive and other plans	[2]	-7			-7
Repurchase of common shares	[3]	-127			-127
Ending Balance at Dec. 31, 2014		$3,325	$1	$0	$3,349	($25)	[1]
[1]	At December 31, 2014 and September 30, 2014, the after-tax accumulated other comprehensive loss of $25 million and gain of $107 million, respectively, was comprised of unrecognized prior service credits as a result of certain employee benefit plan amendments of $54 million and $59 million, respectively, and net unrealized translation loss of $79 million and gain of $48 million, respectively.
[2]	Common shares issued were 196,739 for the three months ended December 31, 2014
[3]	Common shares repurchased were 1,227,440 for the three months ended December 31, 2014. See Note M of the Notes to Condensed Consolidated Financial Statements.

STATEMENT_OF_CONSOLIDATED_STOC1

STATEMENT OF CONSOLIDATED STOCKHOLDERS' EQUITY (unaudited) (Parenthetical) (USD $)	3 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014
Statement of Stockholders' Equity [Abstract]
After-tax accumulated other comprehensive income (loss)	($25)	$107
Dividends on common stock	$0.34
Unrecognized prior service credits	54	59
Net unrealized translation gains (losses)	($79)	$48
Common shares issued (in shares)	196,739
Stock Repurchased During Period, Shares	1,227,440

STATEMENTS_OF_CONDENSED_CONSOL

STATEMENTS OF CONDENSED CONSOLIDATED CASH FLOWS (unaudited) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
CASH FLOWS PROVIDED (USED) BY OPERATING ACTIVITIES FROM CONTINUING OPERATIONS
Net income	$32		$110
Loss (income) from discontinued operations (net of tax)	8		-22
Adjustments to reconcile income from continuing operations to cash flows from operating activities
Depreciation and amortization	85		88
Debt issuance cost amortization	4		3
Deferred income taxes	-10		-3
Equity income from affiliates	-4		-6
Distributions from equity affiliates	3		6
Stock based compensation expense	7		8
Net loss (gain) on divestitures	85		-5
Change in operating assets and liabilities	-160	[1]	-161	[1]
TOTAL CASH FLOWS PROVIDED BY OPERATING ACTIVITIES FROM CONTINUING OPERATIONS	50		18
CASH FLOWS PROVIDED (USED) BY INVESTING ACTIVITIES FROM CONTINUING OPERATIONS
Additions to property, plant and equipment	-43		-45
Proceeds from disposal of property, plant and equipment	1		1
Proceeds from sale of operations or equity investments	106		4
TOTAL CASH FLOWS PROVIDED (USED) BY INVESTING ACTIVITIES FROM CONTINUING OPERATIONS	64		-40
CASH FLOWS PROVIDED (USED) BY FINANCING ACTIVITIES FROM CONTINUING OPERATIONS
Repayment of long-term debt	0		-12
Proceeds (repayment) from short-term debt	-6		6
Repurchase of common stock	-127		0
Cash dividends paid	-24		-26
Excess tax benefits related to share-based payments	2		3
TOTAL CASH FLOWS USED BY FINANCING ACTIVITIES FROM CONTINUING OPERATIONS	-155		-29
CASH USED BY CONTINUING OPERATIONS	-41		-51
Cash provided (used) by discontinued operations
Operating cash flows	-84		7
Investing cash flows	-2		-6
Total cash provided (used) by discontinued operations	-86		1
Effect of currency exchange rate changes on cash and cash equivalents	-10		-1
DECREASE IN CASH AND CASH EQUIVALENTS	-137		-51
CASH AND CASH EQUIVALENTS - BEGINNING OF PERIOD	1,393		346
CASH AND CASH EQUIVALENTS - END OF PERIOD	$1,256		$295
[1]	Excludes changes resulting from operations acquired or sold.

SIGNIFICANT_ACCOUNTING_POLICIE

SIGNIFICANT ACCOUNTING POLICIES	3 Months Ended
	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
SIGNIFICANT ACCOUNTING POLICIES	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 regulations.  In the opinion of management, all adjustments considered necessary for a fair presentation have been included.  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, 2014.  Results of operations for the period ended December 31, 2014 are not necessarily indicative of results to be expected for the year ending September 30, 2015.
	Ashland is composed of three reportable segments:  Ashland Specialty Ingredients (Specialty Ingredients), Ashland Performance Materials (Performance Materials) and Valvoline. On July 31, 2014, Ashland completed the sale of the assets and liabilities of Ashland Water Technologies (Water Technologies). As a result of this sale, all prior period operating results and cash flows related to Water Technologies have been reflected as discontinued operations in the Statements of Consolidated Comprehensive Income and Statements of Condensed Consolidated Cash Flows. In addition to the sale of Water Technologies, Ashland realigned certain components remaining in its portfolio of businesses, which includes divesting its Casting Solutions joint venture on June 30, 2014 and the Elastomers division within the Performance Materials reportable segment on December 1, 2014. See Notes B, C, D and O for additional information on this activity and related results as well as Ashland’s current reportable segment results.
	Use of estimates, risks and uncertainties
	The preparation of Ashland’s Condensed Consolidated Financial Statements requires management to make estimates and assumptions that affect the reported amounts of certain assets, liabilities, revenues, expenses and related disclosures of contingent assets and liabilities as well as qualifying subsequent events.  Significant items that are subject to such estimates and assumptions include, but are not limited to, long-lived assets (including goodwill and intangible assets), employee benefit obligations, 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 and adopted during the current year is required in interim financial reporting.  A detailed listing of all new accounting standards relevant to Ashland is included in the Annual Report on Form 10-K for the fiscal year ended September 30, 2014. The following standards were either 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. This guidance will become effective for Ashland on October 1, 2017. Ashland is currently evaluating the new accounting standard and the available implementation options the standard allows as well as the impact this new guidance will have on Ashland's Condensed Consolidated Financial Statements.
	In April 2014, the FASB issued accounting guidance amending the requirements for reporting discontinued operations (ASC 205 Presentation of Financial Statements and ASC 360 Property, Plant and Equipment). This guidance limits the requirement for discontinued operations treatment to the disposal of a component of an entity, or a group of components of an entity, that represents a strategic shift that has (or will have) a major effect on an entity’s operations and financial results. Additionally, this new guidance no longer precludes discontinued operations presentation based on continuing involvement or cash flows following the disposal. Ashland adopted this guidance on October 1, 2014, which is applicable only to divestitures subsequent to the adoption date, and evaluated the Elastomers divestiture under this new guidance. Ashland determined the Elastomers divestiture did not represent a strategic shift that had or will have a major effect on Ashland's operations. As such, the loss on the sale of Elastomers is included in the net gain (loss) on divestitures caption within the Statements of Consolidated Comprehensive Income and Statements of Condensed Consolidated Cash Flows. No reclassification to discontinued operations has been made for the disposition of Elastomers.

DIVESTITURES_Notes

DIVESTITURES (Notes)	3 Months Ended
	Dec. 31, 2014
DIVESTITURES [Abstract]
DIVESTITURES [Text Block]	DIVESTITURES
	Elastomers
	On October 9, 2014, Ashland entered into a definitive agreement to sell the Elastomers division of the Performance Materials reportable segment, which operates a 250-person manufacturing facility in Port Neches, Texas, to Lion Copolymer Holdings, LLC. The Elastomers division, which primarily serves the North American replacement tire market, accounted for approximately 5% of Ashland's 2014 sales of $6.1 billion and 18% of Ashland Performance Materials' $1.6 billion in sales in 2014. The sale was completed on December 1, 2014 in a transaction valued at approximately $120 million which was subject to working capital adjustments. The total post-closing adjusted cash proceeds received before taxes by Ashland during the current quarter was $106 million, which includes estimates for working capital adjustments and transaction costs, as defined in the definitive agreement. Ashland expects an estimated $3 million in proceeds to be received during 2015.
	Elastomers' net assets as of November 30, 2014 were $191 million which primarily included accounts receivable, inventory, property, plant and equipment, non-deductible goodwill and other intangibles and payables. Since the net proceeds received were less than book value, Ashland recorded a loss of $85 million pre-tax within the net gain (loss) on divestiture caption within the Statements of Consolidated Comprehensive Income. The related tax effect was a benefit of $28 million included in the income tax expense caption within the Statements of Consolidated Comprehensive Income.
	As part of this definitive agreement, Ashland will provide certain transition services to Lion Copolymer Holdings, LLC for a fee. While the transition services vary in duration depending upon the type of service provided, Ashland expects to reduce any legacy costs as the transition services are completed.
	As a result of the adoption of the new discontinued operations accounting guidance discussed in Note A, Ashland determined that the sale of Elastomers did not represent a strategic shift that had or will have a major effect on Ashland's operations and financial results. As such, Elastomers' results were included in the Performance Materials reportable segment results of operations and financial position within the Statements of Consolidated Comprehensive Income and Condensed Consolidated Balance Sheet, respectively, until its December 1, 2014 sale.
	Water Technologies
	The sale of the Water Technologies business to a fund managed by Clayton, Dubilier & Rice (CD&R) was completed on July 31, 2014 in a transaction valued at approximately $1.8 billion. The total post-closing adjusted cash proceeds received by Ashland during 2014, before taxes, was $1.6 billion, which includes estimates for certain working capital and other post-closing adjustments, as defined in the definitive agreement. Ashland expects to receive an additional $48 million once a foreign entity completes certain regulatory closing requirements. Receipt of the additional cash proceeds and final settlement of working capital and other post-closing adjustments are expected to occur in fiscal 2015.
	Since this transaction signified Ashland’s exit from the Water Technologies business, Ashland has classified Water Technologies’ results of operations and cash flows within the Statements of Consolidated Comprehensive Income and Statements of Condensed Consolidated Cash Flows as discontinued operations for all periods presented. Certain indirect corporate costs included within the selling, general and administrative expense caption of the Statements of Consolidated Comprehensive Income that were previously allocated to the Water Technologies reportable segment do not qualify for classification within discontinued operations and are now reported as selling, general and administrative expense within continuing operations on a consolidated basis and within the Unallocated and other segment. These costs were $9 million during the three months ended December 31, 2013.
	Ashland retained and agreed to indemnify CD&R for certain liabilities of the Water Technologies business arising prior to the closing of the sale, including certain pension and postretirement liabilities, environmental remediation liabilities and certain legacy liabilities relating to businesses disposed or discontinued by the Water Technologies business. Costs directly related to these retained liabilities have been included within the discontinued operations caption of the Statements of Consolidated Comprehensive Income during the three months ended December 31, 2013. The ongoing effects of the pension and postretirement plans for former Water Technologies employees are reported within the Unallocated and other segment.
	Ashland provides certain transition services to CD&R for a fee. During the three months ended December 31, 2014, Ashland recognized transition service fees of $9 million, which offset costs within the selling, general and administrative expense caption of the Statements of Consolidated Comprehensive Income. While the transition services vary in duration depending upon the type of service provided, Ashland will continue to reduce costs as the transition services are completed. See Note C for further information on the results of operations of Water Technologies for all periods presented.
	Casting Solutions joint venture
	On June 30, 2014, Ashland, in conjunction with its partner, sold the ASK joint venture to investment funds affiliated with Rhône Capital, LLC (Rhône), a London and New York-based private equity investment firm. Total pre-tax proceeds to the sellers, which were split evenly between Ashland and its partner under the terms of the 50/50 joint venture, were $205 million, which included $176 million in cash and a $29 million note from Rhône due in calendar year 2022.

DISCONTINUED_OPERATIONS

DISCONTINUED OPERATIONS	3 Months Ended
	Dec. 31, 2014
Discontinued Operations and Disposal Groups [Abstract]
DISCONTINUED OPERATIONS	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.
	Ashland is subject to liabilities from claims alleging personal injury caused by exposure to asbestos.  Such claims result primarily from indemnification obligations undertaken in 1990 in connection with the sale of Riley Stoker Corporation (Riley), a former subsidiary of Ashland, which qualified as a discontinued operation, and from the 2009 acquisition of Hercules, a wholly-owned subsidiary of Ashland.  Adjustments to the recorded litigation reserves and related insurance receivables are recorded within discontinued operations.  See Note K for more information related to the adjustments on asbestos liabilities and receivables.
	As previously described in Note B, on July 31, 2014, Ashland completed the sale of the Water Technologies business to CD&R. Sales for the three months ended December 31, 2013 were $436 million. The results of operations for the three months ended December 31, 2013 are included in the table below. Ashland has made post-closing adjustments as defined by the definitive agreement during the three months ended December 31, 2014.
	Components of amounts reflected in the Statements of Consolidated Comprehensive Income related to discontinued operations are presented in the following table for the three months ended December 31, 2014 and 2013.
		Three months ended
		31-Dec
	(In millions)	2014			2013
	Income (loss) from discontinued operations (net of tax)
	Asbestos-related litigation	$	(1	)	$	(1	)
	Water Technologies (a)	(3		)	23
	Loss on disposal of discontinued operations (net of tax)
	Water Technologies	(4		)	—
	Total income (loss) from discontinued operations (net of tax)	$	(8	)	$	22
	(a)	For the three months ended December 31, 2013, pretax operating income recorded for Water Technologies was $36 million.

RESTRUCTURING_ACTIVITIES

RESTRUCTURING ACTIVITIES	3 Months Ended
	Dec. 31, 2014
Restructuring and Related Activities [Abstract]
RESTRUCTURING ACTIVITIES	RESTRUCTURING ACTIVITIES
	Ashland periodically implements corporate restructuring programs related to acquisitions, divestitures or other cost reduction programs in order to enhance profitability through streamlined operations and an improved overall cost structure for each business.
	During 2014, Ashland announced a global restructuring program to streamline the resources used across the organization. As part of this global restructuring program, Ashland announced a voluntary severance offer (VSO) to certain U.S. employees. Approximately 400 employees were formally approved for the VSO. Additionally, during 2014, an involuntary program for employees was also initiated as part of the global restructuring program. Substantially all payments related to the VSO and involuntary programs are expected to be paid by March 31, 2015. As of December 31, 2014 and September 30, 2014, the remaining restructuring reserve for this global restructuring program was $38 million and $53 million, respectively.
	As of December 31, 2014 and September 30, 2014, the remaining $3 million, respectively, in restructuring reserves for other previously announced programs principally consisted of expected future severance payments for programs implemented during 2011. In addition, as of December 31, 2014 and September 30, 2014, the remaining restructuring reserve for all qualifying facility costs totaled $8 million and $9 million, respectively.
	The following table summarizes the related activity in these reserves for the three months ended December 31, 2014 and 2013.  The severance reserves are included in accrued expenses and other liabilities while facility costs reserves are primarily within other noncurrent liabilities in the Condensed Consolidated Balance Sheets.
					Facility
	(In millions)	Severance			costs			Total
	Balance as of September 30, 2014	$	56		$	9		$	65
	Utilization (cash paid or otherwise settled)	(15		)	(1		)	(16		)
	Balance at December 31, 2014	$	41		$	8		$	49
	Balance as of September 30, 2013	$	17		$	8		$	25
	Reserve adjustments	1			—			1
	Utilization (cash paid or otherwise settled)	(4		)	(1		)	(5		)
	Balance at December 31, 2013	$	14		$	7		$	21

FAIR_VALUE_MEASUREMENTS

FAIR VALUE MEASUREMENTS	3 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	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.
	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 (market approach), 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, 2014.
	(In millions)	Carrying				Total			Quoted prices		Significant		Significant
		value				fair			in active		other		unobservable
						value			markets for		observable		inputs
									identical		inputs		Level 3
									assets		Level 2
									Level 1
	Assets
	Cash and cash equivalents	$	1,256			$	1,256		$	1,256	$	—	$	—
	Deferred compensation investments (a)	186				186			44		142		—
	Investments of captive insurance company (a)	3				3			3		—		—
	Foreign currency derivatives	3				3			—		3		—
	Total assets at fair value	$	1,448			$	1,448		$	1,303	$	145	$	—
	Liabilities
	Foreign currency derivatives	$	6			$	6		$	—	$	6	$	—
	(a)	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, 2014.
	(In millions)	Carrying				Total			Quoted prices		Significant		Significant
		value				fair			in active		other		unobservable
						value			markets for		observable		inputs
									identical		inputs		Level 3
									assets		Level 2
									Level 1
	Assets
	Cash and cash equivalents	$	1,393			$	1,393		$	1,393	$	—	$	—
	Deferred compensation investments (a)	184				184			45		139		—
	Investments of captive insurance company (a)	3				3			3		—		—
	Foreign currency derivatives	11				11			—		11		—
	Total assets at fair value	$	1,591			$	1,591		$	1,441	$	150	$	—
	Liabilities
	Foreign currency derivatives	$	9			$	9		$	—	$	9	$	—
	(a)	Included in other noncurrent assets in the Condensed Consolidated Balance Sheets.
	Derivative and hedging activities
	Currency hedges
	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 of 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 marked-to-market 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 gains and losses recognized during the three months ended December 31, 2014 and 2013 within the Statements of Consolidated Comprehensive Income.
		Three months ended
		December 31
	(In millions)	2014				2013
	Foreign currency derivative gain (loss)	$	(4	)		$	3
	The following table summarizes the fair values of the outstanding foreign currency derivatives as of December 31, 2014 and September 30, 2014 included in accounts receivable and accrued expenses and other liabilities of the Condensed Consolidated Balance Sheets.
		December 31				September 30
	(In millions)	2014				2014
	Foreign currency derivative assets	$	1			$	2
	Notional contract values	59				88
	Foreign currency derivative liabilities	$	4			$	4
	Notional contract values	335				281
	Net investment hedges
	During 2014, Ashland entered into foreign currency contracts in order to manage the foreign currency exposure of the net investment in certain foreign operations, as a result of certain proceeds from the sale of Water Technologies being received in non-U.S. denominated currencies. During the three months ended December 31, 2014, these foreign currency contracts were settled and Ashland entered into new foreign currency contracts. Ashland designated the foreign currency contracts as hedges of net investment in its foreign subsidiaries. As a result, Ashland records these hedges at fair value using forward rates, with the effective portion of the gain or loss reported as a component of the cumulative translation adjustment within accumulated other comprehensive income (AOCI) and subsequently recognized in the Statements of Consolidated Comprehensive Income when the hedged item affects net income. There was no hedge ineffectiveness with these instruments during the three months ended December 31, 2014.
	As of December 31, 2014 and September 30, 2014, the total notional value of foreign currency contracts equaled $197 million and $206 million, respectively. The fair value of Ashland's net investment hedge assets and liabilities are calculated using forward rates. Accordingly, these instruments are deemed to be Level 2 measurements within the fair value hierarchy. Counterparties to these net investment hedges are highly rated financial institutions which Ashland believes carry only a nominal risk of nonperformance. The following table summarizes the fair value of the outstanding net investment hedge instruments as of December 31, 2014 and September 30, 2014.
			December 31				September 30
	(In millions)	Consolidated balance sheet caption	2014				2014
	Net investment hedge assets	Accounts receivable	$	2			$	9
	Net investment hedge liabilities	Accrued expenses and other liabilities	2				5
	The following table summarizes the unrealized gain on the net investment hedge instruments recognized within the cumulative translation adjustment within AOCI during the three months ended December 31, 2014. No portion of the loss was reclassified to income during the quarter.
	Three months ended
		December 31
	(In millions)	2014
	Change in unrealized gain in AOCI	$	—		(a)
	Tax impact of change in unrealized gain in AOCI	(1		)
	(a)	Denotes a value that nets to less than $1 million.
	Other financial instruments
At December 31, 2014 and September 30, 2014, Ashland’s long-term debt had a carrying value of $2,952 million and $2,951 million, respectively, compared to a fair value of $3,132 million and $3,102 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, 2014
Inventory Disclosure [Abstract]
INVENTORIES	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 chemicals, plastics and lubricants 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)	2014			2014
	Finished products	$	539		$	557
	Raw materials, supplies and work in process	259			239
	LIFO reserve	(52		)	(31		)
		$	746		$	765

GOODWILL_AND_OTHER_INTANGIBLES

GOODWILL AND OTHER INTANGIBLES	3 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND OTHER INTANGIBLES	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, 2014 assessment, Ashland determined that its reporting units for allocation of goodwill included the Specialty Ingredients and Valvoline reportable segments, and the Composites, Intermediates/Solvents, and Elastomers reporting units within the Performance Materials reportable segment, and determined at that time that no impairment existed. As discussed in Note B, Ashland sold the Elastomers division on December 1, 2014 and as a result, Elastomers is no longer a reporting unit as of December 31, 2014.
	The following is a progression of goodwill by reportable segment for the three months ended December 31, 2014.
		Specialty			Performance
	(In millions)	Ingredients			Materials			(a)	Valvoline		Total
	Balance at September 30, 2014	$	2,129		$	346			$	168	$	2,643
	Divestiture	—			(10		)		—		(10		)
	Currency translation adjustment	(41		)	(6		)		—		(47		)
	Balance at December 31, 2014	$	2,088		$	330			$	168	$	2,586
	(a)	As of December 31, 2014, goodwill consisted of $172 million for the Intermediates/Solvents reporting unit and $158 million for the Composites reporting unit.
	Other intangible assets
	Intangible assets principally consist of trademarks and trade names, intellectual property, customer relationships, and in-process research and development (IPR&D). 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 4 to 25 years, intellectual property over 5 to 20 years, and customer relationships over 3 to 24 years.
	IPR&D and certain intangible assets within trademarks and trade names have been classified as indefinite-lived and had a balance of $322 million as of December 31, 2014 and September 30, 2014, respectively. 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, 2014 and September 30, 2014.
		December 31, 2014
		Gross							Net
		carrying			Accumulated				carrying
	(In millions)	amount			amortization				amount
	Definite-lived intangible assets
	Trademarks and trade names (a)	$	66		$	(45	)		$	21
	Intellectual property (a)	809			(233		)		576
	Customer relationships	461			(126		)		335
	Total definite-lived intangible assets	1,336			(404		)		932
	Indefinite-lived intangible assets
	IPR&D	19			—				19
	Trademarks and trade names	303			—				303
	Total intangible assets	$	1,658		$	(404	)		$	1,254
	(a)	Elastomers had a gross carrying amount for trademarks/trade names and intellectual property of $6 million and $18 million, respectively, with $5 million of accumulated amortization for each caption.
		September 30, 2014
		Gross							Net
		carrying			Accumulated				carrying
	(In millions)	amount			amortization				amount
	Definite-lived intangible assets
	Trademarks and trade names	$	72		$	(49	)		$	23
	Intellectual property	827			(226		)		601
	Customer relationships	481			(118		)		363
	Total definite-lived intangible assets	1,380			(393		)		987
	Indefinite-lived intangible assets
	IPR&D	19			—				19
	Trademarks and trade names	303			—				303
	Total intangible assets	$	1,702		$	(393	)		$	1,309
	Amortization expense recognized on intangible assets was $21 million and $22 million for the three months ended December 31, 2014 and 2013, respectively, and is included in the selling, general and administrative expense caption of the Statements of Consolidated Comprehensive Income. Estimated amortization expense for future periods is $82 million in 2015 (includes three months actual and nine months estimated), $80 million in 2016, $80 million in 2017, $79 million in 2018 and $75 million in 2019.

DEBT

DEBT	3 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
DEBT	DEBT
	The following table summarizes Ashland’s current and long-term debt as of the reported Condensed Consolidated Balance Sheet dates.
		December 31			September 30
	(In millions)	2014			2014
	4.750% notes, due 2022	$	1,120		$	1,120
	3.875% notes, due 2018	700			700
	3.000% notes, due 2016	600			600
	6.875% notes, due 2043	376			376
	Accounts receivable securitization (a)	220			255
	6.50% junior subordinated notes, due 2029	134			134
	Revolving credit facility	80			45
	Other international loans, interest at a weighted-
	average rate of 7.0% at December 31, 2014 (6.0% to 10.2%)	23			29
	Medium-term notes, due 2015-2019, interest at a weighted-
	average rate of 8.7% at December 31, 2014 (8.4% to 9.4%)	14			14
	Other	8			7
	Total debt	3,275			3,280
	Short-term debt	(323		)	(329		)
	Current portion of long-term debt	(9		)	(9		)
	Long-term debt (less current portion)	$	2,943		$	2,942
	(a)	During the three months ended December 31, 2014, the potential funding for qualified receivables was reduced from $275 million to $250 million.
	The scheduled aggregate maturities of debt by year are as follows: $251 million remaining in 2015, $600 million in 2016, none in 2017, $780 million in 2018 and $5 million in 2019.  The borrowing capacity remaining under the $1.2 billion senior unsecured revolving credit facility (the 2013 Senior Credit Facility) was $1,047 million, due to an outstanding balance of $80 million, as well as a reduction of $73 million for letters of credit outstanding at December 31, 2014. No capacity remained under the accounts receivable securitization facility as the amount borrowed equaled the value of qualifying receivables at December 31, 2014.
	Covenant restrictions
	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 indebtedness, further negative pledges, investments, mergers, sale of assets and restricted payments and other customary limitations.  As of December 31, 2014, Ashland is in compliance with all debt agreement covenant restrictions.
	Financial covenants
	The maximum consolidated leverage ratio permitted under the 2013 Senior Credit Facility during its entire duration is 3.25.  At December 31, 2014, Ashland’s calculation of the consolidated leverage ratio was 2.0, which is below the maximum consolidated leverage ratio of 3.25.
	The minimum required consolidated interest coverage ratio under the 2013 Senior Credit Facility during its entire duration is 3.0.  At December 31, 2014, Ashland’s calculation of the interest coverage ratio was 6.5, which exceeds the minimum required consolidated ratio of 3.0.

INCOME_TAXES

INCOME TAXES	3 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES
	Current fiscal year
	Ashland’s estimated annual effective income tax rate used to determine income tax expense in interim financial reporting for the year ending September 30, 2015 is 24.6%. Ashland’s effective tax rate in any interim period is subject to adjustments related to discrete items and changes within foreign effective tax rates resulting from income or loss fluctuations.  The overall effective tax rate was 7.0% for the three months ended December 31, 2014 and includes $31 million of discrete tax benefits on pretax charges of $93 million, primarily related to the sale of the Elastomers division.
	Prior fiscal year
	Ashland’s estimated annual effective income tax rate used to determine income tax expense in interim financial reporting for the year ending September 30, 2014 was 21.1%. The overall effective tax rate was 17.0% for the three months ended December 31, 2013 and was impacted by favorable discrete items of $5 million, primarily related to the release of a foreign valuation allowance and certain non-taxable pretax income amounts.
	Unrecognized tax benefits
	Changes in unrecognized tax benefits are summarized as follows for the three months ended December 31, 2014.
	(In millions)
	Balance at October 1, 2014	$	155
	Increases related to positions taken on items from prior years	1
	Decreases related to positions taken on items from prior years	(1		)
	Increases related to positions taken in the current year	7
	Balance at December 31, 2014	$	162
	In the next twelve months, Ashland expects a decrease in the amount accrued for uncertain tax positions of up to $17 million for continuing operations and $13 million for discontinued operations related primarily to audit settlements and statute of limitations expirations in various tax jurisdictions. 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.
	As of December 31, 2014, Ashland has recorded valuation allowances related to state net operating loss carry forwards and other state deferred tax asset balances. Ashland will continue to assess, based upon all available evidence both positive and negative, whether the valuation allowances are supportable and it is possible that an amount equal to $20 million to $30 million could be reversed in fiscal year 2015.

EMPLOYEE_BENEFIT_PLANS

EMPLOYEE BENEFIT PLANS	3 Months Ended
	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
EMPLOYEE BENEFIT PLANS	EMPLOYEE BENEFIT PLANS
	For the three months ended December 31, 2014, Ashland contributed $4 million to its U.S. pension plans and $2 million to its non-U.S. pension plans.  Ashland expects to make additional contributions to the U.S. plans of approximately $76 million and to the non-U.S. plans of approximately $13 million during the remainder of 2015.
	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 Unallocated and other segment. In accordance with U.S. GAAP, a portion of the other components of pension and other postretirement benefit costs (i.e. interest cost, expected return on assets, and amortization of prior service credit) related to Water Technologies has been reclassified from the Unallocated and other segment to the discontinued operations caption of the Statements of Consolidated Comprehensive Income. For the three months ended December 31, 2013, income of $2 million was classified within discontinued operations.
	The following table details the components of pension and other postretirement benefit costs for both continuing and discontinued operations.
								Other postretirement
		Pension benefits						benefits
	(In millions)	2014			2013			2014			2013
	Three months ended December 31
	Service cost (a)	$	7		$	11		$	—		$	—
	Interest cost	44			49			2			2
	Expected return on plan assets	(54		)	(59		)	—			—
	Amortization of prior service credit	(1		)	(1		)	(4		)	(5		)
		$	(4	)	$	—		$	(2	)	$	(3	)
	(a)	Service cost and net pension benefit costs of $0 denote values less than $1 million.

LITIGATION_CLAIMS_AND_CONTINGE

LITIGATION, CLAIMS AND CONTINGENCIES	3 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
LITIGATION, CLAIMS AND CONTINGENCIES	LITIGATION, CLAIMS AND CONTINGENCIES
	Asbestos litigation
	Ashland and Hercules, a wholly-owned subsidiary of Ashland that was acquired in 2009, 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, 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)	2014			2013			2014			2013		2012
	Open claims - beginning of period	65			65			65			66		72
	New claims filed	1			1			2			2		2
	Claims settled	—			—			(1	)		(1	)	(1	)
	Claims dismissed	—			—			(1	)		(2	)	(7	)
	Open claims - end of period	66			66			65			65		66
	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.  As a result of the most recent annual update of this estimate, completed during the June 2014 quarter, it was determined that the liability for asbestos claims should be increased by $4 million.  Total reserves for asbestos claims were $431 million at December 31, 2014 compared to $438 million at September 30, 2014.
	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)	2014				2013				2014			2013			2012
	Asbestos reserve - beginning of period	$	438			$	463			$	463		$	522		$	543
	Reserve adjustment	—				—				4			(28		)	11
	Amounts paid	(7		)		(8		)		(29		)	(31		)	(32		)
	Asbestos reserve - end of period	$	431			$	455			$	438		$	463		$	522
	Ashland asbestos-related receivables
	Ashland has insurance coverage for most of the 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 most of the coverage currently being accessed.  As a result, any increases in the asbestos reserve have been largely offset by probable insurance recoveries.  The amounts not recoverable generally are due from insurers that are insolvent, rather than as a result of uninsured claims or the exhaustion of Ashland’s insurance coverage.
	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.  Approximately 70% of the estimated receivables from insurance companies are expected to be due from domestic insurers. Of the insurance companies rated by A. M. Best, all have a credit rating of B+ or higher as of December 31, 2014.  The remainder of the insurance receivable is due from London insurance companies, which generally have lower credit quality ratings, and from Underwriters at Lloyd’s, whose insurance policy obligations have been transferred to a Berkshire Hathaway entity.  Ashland discounts this portion of the receivable based upon the projected timing of the receipt of cash from those insurers unless likely settlement amounts can be determined.
	In October 2012, Ashland and Hercules initiated various arbitration proceedings against Underwriters at Lloyd’s, certain London companies and/or Chartis (AIG) member companies seeking to enforce these insurers’ contractual obligations to provide indemnity for asbestos liabilities and defense costs under existing coverage-in-place agreements. In addition, Ashland and Hercules initiated a lawsuit in Kentucky state court against certain Berkshire Hathaway entities (National Indemnity Company and Resolute Management, Inc.) on grounds that these Berkshire entities wrongfully interfered with Underwriters' and Chartis' performance of their respective contractual obligations to provide asbestos coverage by directing the insurers to reduce and delay certain claim payments.
	On January 13, 2015, Ashland and Hercules entered into a comprehensive settlement with Underwriters at Lloyd’s, certain London Companies and Chartis (AIG) member companies, along with National Indemnity and Resolute Management, Inc., under which Ashland and Hercules received a total of $398 million and, in exchange, released all claims against these entities for past, present and future coverage obligations arising out of the asbestos coverage-in-place agreements that were the subject of the pending arbitration proceedings. In addition, as part of this settlement, Ashland and Hercules released all claims against National Indemnity and Resolute Management, Inc. in the Kentucky state court action. As a result, the arbitration proceedings and the Kentucky state court action have been terminated. Ashland intends to segregate a significant portion of the funds received in the settlement to pay for ongoing and future litigation defense and claim settlement costs incurred in connection with asbestos claims.
	As a result of this settlement, during the quarter ending March 31, 2015, Ashland expects to record an after-tax gain of approximately $110 million to $130 million, within the discontinued operations caption of the Statement of Consolidated Comprehensive Income and an approximately $250 million reduction in the receivable balance within the Condensed Consolidated Balance Sheet. The ranges reflect certain current estimates and assumptions with respect to tax consequences of the transaction that may change as certain tax attributes are finalized.
	At December 31, 2014, Ashland’s receivable for recoveries of litigation defense and claim settlement costs from insurers amounted to $392 million, of which $80 million relates to costs previously paid.  Receivables from insurers amounted to $402 million at September 30, 2014.  During the June 2014 quarter, the annual update of the model used for purposes of valuing the asbestos reserve described above, and its impact on valuation of future recoveries from insurers, was updated.  This model update resulted in a $7 million increase in the receivable for probable insurance recoveries. In 2014, subsequent to the model update, a $15 million increase to the receivable was recorded to reflect a change to certain model assumptions related to the timing of receipts.
	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)	2014				2013				2014			2013			2012
	Insurance receivable - beginning of period	$	402			$	408			$	408		$	423		$	431
	Receivable adjustment	—				—				22			(3		)	19
	Amounts collected	(10		)		(3		)		(28		)	(12		)	(27		)
	Insurance receivable - end of period	$	392			$	405			$	402		$	408		$	423
	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)	2014			2013			2014			2013		2012
	Open claims - beginning of period	21			21			21			21		21
	New claims filed	—			—			1			1		1
	Claims dismissed	—			—			(1	)		(1	)	(1	)
	Open claims - end of period	21			21			21			21		21
	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 2014 quarter, it was determined that the liability for Hercules asbestos-related claims should be increased by $10 million.  Total reserves for asbestos claims were $324 million at December 31, 2014 compared to $329 million at September 30, 2014.
	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)	2014				2013				2014			2013			2012
	Asbestos reserve - beginning of period	$	329			$	342			$	342		$	320		$	311
	Reserve adjustment	—				—				10			46			30
	Amounts paid	(5		)		(5		)		(23		)	(24		)	(21		)
	Asbestos reserve - end of period	$	324			$	337			$	329		$	342		$	320
	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 domestic insurers. Of the insurance companies rated by A. M. Best, all have a credit rating of B+ or higher as of December 31, 2014.
	As of December 31, 2014 and September 30, 2014, the receivables from insurers amounted to $77 million, respectively. During the June 2014 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 caused a $3 million increase in the receivable for probable insurance recoveries. As a result of the January 13, 2015, settlement reported above, Hercules has resolved all disputes with Chartis (AIG) member companies under their existing coverage-in-place agreement for past, present and future Hercules asbestos claims, and an adjustment in the insurance receivable will be made in the next quarterly report.
	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)	2014				2013				2014			2013			2012
Insurance receivable - beginning of period	$	77			$	75			$	75		$	56		$	48
Receivable adjustment	—				—				3			19			9
Amounts collected	—				—				(1		)	—			(1		)
Insurance receivable - end of period	$	77			$	75			$	77		$	75		$	56
Asbestos liability 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, 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 $870 million for the Ashland asbestos-related litigation and approximately $670 million for the Hercules asbestos-related litigation (or approximately $1.5 billion in the aggregate), 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, 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, 2014, such locations included 81 waste treatment or disposal sites where Ashland has been identified as a potentially responsible party under Superfund or similar state laws, 139 current and former operating facilities (including certain operating facilities conveyed to Marathon Ashland Petroleum LLC (MAP) in 2005) and about 1,225 service station properties, of which 82 are being actively remediated.
Ashland’s reserves for environmental remediation amounted to $195 million at December 31, 2014 compared to $197 million at September 30, 2014, of which $156 million at December 31, 2014 and $158 million at September 30, 2014 were classified in other noncurrent liabilities on the Condensed Consolidated Balance Sheets.
The following table provides a reconciliation of the changes in the environmental contingencies and asset retirement obligations during the three months ended December 31, 2014 and 2013.
	Three months ended
	31-Dec
(In millions)	2014				2013
Reserve - beginning of period	$	197			$	211
Disbursements, net of cost recoveries	(8		)		(8		)
Revised obligation estimates and accretion	6				5
Reserve - end of period	$	195			$	208
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, 2014 and September 30, 2014, Ashland’s recorded receivable for these probable insurance recoveries was $23 million and $24 million, respectively, which 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, 2014 and 2013.
	Three months ended
	31-Dec
(In millions)	2014				2013
Environmental expense	$	5			$	4
Accretion	1				1
Legal expense	1				—
Total expense	7				5
Insurance receivable	—				(1		)
Total expense, net of receivable activity (a)	$	7			$	4
(a)	Net expense of $1 million for the three months ended December 31, 2013 relates to divested businesses which qualified for treatment as discontinued operations and for which certain environmental liabilities were retained by Ashland.  These amounts are classified within the income from discontinued operations caption of the Statements of Consolidated Comprehensive Income.
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 $430 million.  No individual remediation location is significant, as the largest reserve for any site is 13% or less 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, 2014 and September 30, 2014.  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, 2014.

EARNINGS_PER_SHARE

EARNINGS PER SHARE	3 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
EARNINGS PER SHARE	EARNINGS PER SHARE
	The following is the computation of basic and diluted earnings per share (EPS) from continuing operations.  Stock appreciation rights (SARs) 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 1.2 million and 0.6 million at December 31, 2014 and 2013, respectively.  Earnings per share is reported under the treasury stock method.
		Three months ended
		31-Dec
	(In millions except per share data)	2014		2013
	Numerator
	Numerator for basic and diluted EPS – Income
	from continuing operations	$	40	$	88
	Denominator
	Denominator for basic EPS – Weighted-average
	common shares outstanding	69		77
	Share-based awards convertible to common shares	1		1
	Denominator for diluted EPS – Adjusted weighted-
	average shares and assumed conversions	70		78
	EPS from continuing operations
	Basic	$	0.58	$	1.14
	Diluted	0.57		1.12

STOCKHOLDERS_EQUITY_ITEMS

STOCKHOLDERS' EQUITY ITEMS	3 Months Ended
	Dec. 31, 2014
Equity [Abstract]
STOCKHOLDERS' EQUITY ITEMS	STOCKHOLDERS’ EQUITY ITEMS
	Stock repurchase programs
	During the March 2014 quarter, the Board of Directors of Ashland authorized a $1.35 billion common stock repurchase program, of which $270 million is still available as of December 31, 2014. This new authorization replaced Ashland’s previous $600 million share repurchase authorization, approved in May 2013, which had $450 million remaining. Under the new program, Ashland’s common shares may be repurchased in open market transactions, privately negotiated transactions or pursuant to one or more accelerated stock repurchase programs or Rule 10b5-1 plans. This new repurchase program will expire on December 31, 2015.
	As part of the $1.35 billion common stock repurchase program, Ashland announced in the September 30, 2014 quarter that it had entered into an agreement with each of Deutsche Bank Securities and JPMorgan to repurchase an aggregate of $250 million of Ashland's common stock. Under the terms of the agreement, the financial institutions purchased a pre-determined number of shares on various trading days dependent upon Ashland's prevailing stock price on that date. The term of the agreements is through June 30, 2015. During the December 31, 2014 quarter, Ashland completed these agreements, receiving 1.2 million shares of common stock for a total cost of $127 million. The settlement price, which represents the average amount spent after commissions over the common shares repurchased throughout the program, was $104.51 per share. In total, Ashland paid $250 million and received 2.4 million shares of common stock under the agreements.
	In addition, Ashland also announced in the September 30, 2014 quarter that it has entered into accelerated share repurchase agreements (2014 ASR Agreements) with each of Deutsche Bank AG, London Branch (Deutsche Bank), and JPMorgan Chase Bank, N.A. (JPMorgan), to repurchase an aggregate of $750 million of Ashland's common stock. Under the 2014 ASR Agreements, Ashland paid an initial purchase price of $750 million, split evenly between the financial institutions. As of September 30, 2014, Ashland received an initial delivery of approximately 5.9 million shares of common stock under the 2014 ASR Agreements. The 2014 ASR Agreements have a variable maturity, at the financial institutions option, with a scheduled termination date of no later than June 30, 2015. No shares were received in the December 31, 2014 quarter under the 2014 ASR Agreements.
	Stockholder dividends
	During the December 2014 quarter, the Board of Directors of Ashland announced and paid a quarterly cash dividend of 34 cents per share to eligible shareholders of record. The same amount was paid for quarterly dividends in each quarter of fiscal 2014.
	Accumulated other comprehensive income
	Components of other comprehensive income recorded in the Statements of Consolidated Comprehensive Income are presented below, before tax and net of tax effects.
		2014									2013
					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)	$	(126	)	$	(1	)	$	(127	)	$	39		$	—	$	39
	Pension and postretirement obligation adjustment:
	Amortization of unrecognized prior service
	credits included in net income (a)	(5		)	—			(5		)	(6		)	2		(4		)
	Total other comprehensive income (loss)	$	(131	)	$	(1	)	$	(132	)	$	33		$	2	$	35
	(a)	Amortization of unrecognized prior service credits are included in the calculation of net periodic benefit costs (income) for pension and other postretirement plans. For specific financial statement captions impacted by the amortization see the table below.
	In accordance with U.S. GAAP, as discussed in the table above, certain pension and postretirement costs (income) are amortized from accumulated other comprehensive income and recognized in net income. The captions on the Statements of Consolidated Comprehensive Income impacted by the amortization of unrecognized prior service credits for pension and other postretirement plans are disclosed below. See Note J for more information.
		Three months ended
		31-Dec
	(In millions)	2014			2013
	Cost of sales	$	(2	)	$	(2	)
	Selling, general and administrative expense	(3		)	(3		)
	Discontinued operations	—			(1		)
	Total amortization of unrecognized prior service credits	$	(5	)	$	(6	)

STOCK_INCENTIVE_PLANS

STOCK INCENTIVE PLANS	3 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
STOCK INCENTIVE PLANS	STOCK INCENTIVE PLANS
	Ashland has stock incentive plans under which key employees or directors are granted stock-settled stock appreciation rights (SARs), performance share 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.  Stock-based compensation expense was $14 million and $8 million for the three months ended December 31, 2014 and 2013, respectively, and is included in the selling, general and administrative expense caption of the Statements of Consolidated Comprehensive Income. The current quarter included a $7 million award modification within performance shares that was designated as a cash item.
	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, 2014 and 2013 were 0.2 million and 0.4 million, respectively. As of December 31, 2014, there was $15 million of total unrecognized compensation costs related to SARs.  That cost is expected to be recognized over a weighted-average period of 2.0 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 are subject to forfeiture upon termination of service before the vesting period ends.  Nonvested stock awards entitle employees or directors to vote the shares.  Cash dividends are paid on nonvested stock awards granted prior to January 2010, while dividends on subsequent nonvested stock awards granted are in the form of additional shares of nonvested stock awards, which are subject to vesting and forfeiture provisions.  Since January 2010, these instruments have been designated as non-participating securities under U.S. GAAP.  Nonvested stock awards granted were 104,750 and 133,300 for the three months ended December 31, 2014 and 2013, respectively. As of December 31, 2014, there was $20 million of total unrecognized compensation costs related to nonvested stock awards.  That cost is expected to be recognized over a weighted-average period of 2.1 years.
	Performance shares
	Ashland sponsors a long-term incentive plan that awards performance shares/units to certain key employees that are tied to Ashland’s overall financial performance relative to the financial performance of selected industry peer groups and/or internal targets.  Awards are granted annually, with each award covering a three-year performance cycle.  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 over the three-year performance cycle.  TSR relative to peers is considered a market condition while ROI is considered a performance condition under applicable U.S. GAAP.  Nonvested performance shares/units do not entitle employees to vote the shares or to receive any dividends thereon.  Performance shares granted for the three months ended December 31, 2014 and 2013 were 0.1 million. As of December 31, 2014, there was $10 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.
	During the three months ended December 31, 2014, Ashland modified certain awards of its performance shares. The awards were modified to provide that the instruments be paid in cash instead of stock. This change in payment designation caused Ashland to recognize $7 million in incremental stock-based compensation expense related to this award modification during the three months ended December 31, 2014.

REPORTABLE_SEGMENT_INFORMATION

REPORTABLE SEGMENT INFORMATION	3 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
REPORTABLE SEGMENT INFORMATION	REPORTABLE SEGMENT INFORMATION
	Ashland determines its reportable segments based on how operations are managed internally for the products and services sold to customers and does not aggregate operating segments to arrive at these reportable segments. Subsequent to the sale of Water Technologies and a business realignment during 2014, Ashland’s businesses are managed within three reportable segments:  Specialty Ingredients, Performance Materials and Valvoline.
	Reportable segment business descriptions
	Specialty Ingredients is a global leader of cellulose ethers and vinyl pyrrolidones. 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 plant and seed extract, cellulose ethers and vinyl pyrrolidones, as well as acrylic and polyurethane-based adhesives. Specialty Ingredients includes two divisions; Consumer Specialties and Industrial Specialties that 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; manufacturers of paint, coatings and construction materials; packaging and converting; and oilfield service companies.
	Subsequent to the sale of Elastomers on December 1, 2014, Performance Materials is comprised of two divisions: Composites and Intermediates/Solvents. Elastomers results were included in Performance Materials' results of operations within the Statements of Consolidated Comprehensive Income until its December 1, 2014 sale. Performance Materials is the global leader in unsaturated polyester resins and vinyl ester resins. The commercial unit has leading positions in gelcoats, maleic anhydride, butanediol, tetrahydrofuran, N-Methylpyrolidone, and other intermediates and solvents. Key customers include: manufacturers of residential and commercial building products; infrastructure engineers; wind blade and pipe manufacturers; automotive and truck OEM suppliers; boatbuilders; adhesives, engineered plastics and electronic producers; and specialty chemical manufacturers.
	The Performance Materials commercial unit also provided metal casting consumables and design services for effective foundry management through its 50% ownership in the ASK Chemicals GmbH joint venture, which was sold on June 30, 2014. See Note B for information on the divestiture of this investment and the Elastomers division.
	Valvoline is a leading, worldwide producer and distributor of premium-branded automotive, commercial and industrial lubricants, automotive chemicals and car-care products. It ranks as the #2 quick-lube chain and #3 passenger car motor oil brand in the United States. The brand operates and franchises approximately 930 Valvoline Instant Oil ChangeSM centers in the United States. It also markets Valvoline™ lubricants and automotive chemicals; MaxLife™ lubricants created for higher-mileage engines; NextGen™ motor oil, created with recycled, re-refined base oil; SynPower™ synthetic motor oil; Car Brite™ automotive appearance products; and Zerex™ antifreeze. Key customers include: retail auto parts stores and mass merchandisers who sell to consumers; installers, such as car dealers, repair shops and quick lubes; commercial fleets; and distributors.
	Unallocated and Other generally includes items such as components of pension and other postretirement benefit plan expenses (excluding service costs, which are allocated to the reportable segments), certain significant company-wide restructuring activities and legacy costs or adjustments that relate to divested businesses that are no longer operated by Ashland, including the Water Technologies business.
	Reportable segment results
	Results of Ashland’s reportable segments are presented based on its management structure and internal accounting practices.  The structure and practices are 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, such as the restructuring plans described in Note D, and other costs or adjustments that generally 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 to Unallocated and other.  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 businesses change.  Revisions to Ashland’s methodologies that are deemed insignificant are applied on a prospective basis.
	The following table presents various financial information for each reportable segment, reflective of the 2014 business realignment, for the three months ended December 31, 2014 and 2013.  As part of this realignment, historical financial results for both the Specialty Ingredients and Performance Materials reportable segments have been revised to account for this new alignment.
		Three months ended
		31-Dec
	(In millions - unaudited)	2014		2013
	SALES
	Specialty Ingredients	$	561	$	581
	Performance Materials	338		365
	Valvoline	492		486
		$	1,391	$	1,432
	OPERATING INCOME
	Specialty Ingredients	$	60	$	51
	Performance Materials	25		14
	Valvoline	83		75
	Unallocated and other (a)	1		3
		$	169	$	143
	(a)	As a result of the sale of Water Technologies, Unallocated and other is impacted by certain items related to discontinued operations accounting. For the three months ended December 31, 2013, Unallocated and other includes $9 million of costs previously charged to the Water Technologies business for primarily indirect corporate cost allocations that U.S. GAAP provisions require to be included within continuing operations. Additionally, a portion of the components of pension and other postretirement benefit costs other than service costs (i.e. interest cost, expected return on assets, and amortization of prior service credit) related to Water Technologies has been reclassified from the Unallocated and other segment to the discontinued operations caption of the Statements of Consolidated Comprehensive Income. Pension and other postretirement benefit income for the three months ended December 31, 2013 of $2 million was classified within discontinued operations.

SIGNIFICANT_ACCOUNTING_POLICIE1

SIGNIFICANT ACCOUNTING POLICIES (Policies)	3 Months Ended
	Dec. 31, 2014
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 regulations.  In the opinion of management, all adjustments considered necessary for a fair presentation have been included.  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, 2014.  Results of operations for the period ended December 31, 2014 are not necessarily indicative of results to be expected for the year ending September 30, 2015.
	Ashland is composed of three reportable segments:  Ashland Specialty Ingredients (Specialty Ingredients), Ashland Performance Materials (Performance Materials) and Valvoline. On July 31, 2014, Ashland completed the sale of the assets and liabilities of Ashland Water Technologies (Water Technologies). As a result of this sale, all prior period operating results and cash flows related to Water Technologies have been reflected as discontinued operations in the Statements of Consolidated Comprehensive Income and Statements of Condensed Consolidated Cash Flows. In addition to the sale of Water Technologies, Ashland realigned certain components remaining in its portfolio of businesses, which includes divesting its Casting Solutions joint venture on June 30, 2014 and the Elastomers division within the Performance Materials reportable segment on December 1, 2014. See Notes B, C, D and O for additional information on this activity and related results as well as Ashland’s current reportable segment results.
Use of Estimates, Risk and Uncertainties	Use of estimates, risks and uncertainties
	The preparation of Ashland’s Condensed Consolidated Financial Statements requires management to make estimates and assumptions that affect the reported amounts of certain assets, liabilities, revenues, expenses and related disclosures of contingent assets and liabilities as well as qualifying subsequent events.  Significant items that are subject to such estimates and assumptions include, but are not limited to, long-lived assets (including goodwill and intangible assets), employee benefit obligations, 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 and adopted during the current year is required in interim financial reporting.  A detailed listing of all new accounting standards relevant to Ashland is included in the Annual Report on Form 10-K for the fiscal year ended September 30, 2014. The following standards were either 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. This guidance will become effective for Ashland on October 1, 2017. Ashland is currently evaluating the new accounting standard and the available implementation options the standard allows as well as the impact this new guidance will have on Ashland's Condensed Consolidated Financial Statements.
	In April 2014, the FASB issued accounting guidance amending the requirements for reporting discontinued operations (ASC 205 Presentation of Financial Statements and ASC 360 Property, Plant and Equipment). This guidance limits the requirement for discontinued operations treatment to the disposal of a component of an entity, or a group of components of an entity, that represents a strategic shift that has (or will have) a major effect on an entity’s operations and financial results. Additionally, this new guidance no longer precludes discontinued operations presentation based on continuing involvement or cash flows following the disposal. Ashland adopted this guidance on October 1, 2014, which is applicable only to divestitures subsequent to the adoption date, and evaluated the Elastomers divestiture under this new guidance. Ashland determined the Elastomers divestiture did not represent a strategic shift that had or will have a major effect on Ashland's operations. As such, the loss on the sale of Elastomers is included in the net gain (loss) on divestitures caption within the Statements of Consolidated Comprehensive Income and Statements of Condensed Consolidated Cash Flows. No reclassification to discontinued operations has been made for the disposition of Elastomers.

FAIR_VALUE_MEASUREMENTS_Polici

FAIR VALUE MEASUREMENTS (Policies)	3 Months Ended
	Dec. 31, 2014
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.
	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 (market approach), 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.
Derivatives, Methods of Accounting, Derivatives Not Designated or Qualifying as Hedges	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 of 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 marked-to-market 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.
Derivatives, Methods of Accounting, Hedging Derivatives	During 2014, Ashland entered into foreign currency contracts in order to manage the foreign currency exposure of the net investment in certain foreign operations, as a result of certain proceeds from the sale of Water Technologies being received in non-U.S. denominated currencies. During the three months ended December 31, 2014, these foreign currency contracts were settled and Ashland entered into new foreign currency contracts. Ashland designated the foreign currency contracts as hedges of net investment in its foreign subsidiaries. As a result, Ashland records these hedges at fair value using forward rates, with the effective portion of the gain or loss reported as a component of the cumulative translation adjustment within accumulated other comprehensive income (AOCI) and subsequently recognized in the Statements of Consolidated Comprehensive Income when the hedged item affects net income. There was no hedge ineffectiveness with these instruments during the three months ended December 31, 2014.
	As of December 31, 2014 and September 30, 2014, the total notional value of foreign currency contracts equaled $197 million and $206 million, respectively. The fair value of Ashland's net investment hedge assets and liabilities are calculated using forward rates. Accordingly, these instruments are deemed to be Level 2 measurements within the fair value hierarchy. Counterparties to these net investment hedges are highly rated financial institutions which Ashland believes carry only a nominal risk of nonperformance. The following table summarizes the fair value of the outstanding net investment hedge instruments as of December 31, 2014 and September 30, 2014.

INVENTORIES_Policies

INVENTORIES (Policies)	3 Months Ended
	Dec. 31, 2014
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 chemicals, plastics and lubricants are valued at cost using the last-in, first-out (LIFO) method.

GOODWILL_AND_OTHER_INTANGIBLES1

GOODWILL AND OTHER INTANGIBLES (Policies)	3 Months Ended
	Dec. 31, 2014
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, 2014 assessment, Ashland determined that its reporting units for allocation of goodwill included the Specialty Ingredients and Valvoline reportable segments, and the Composites, Intermediates/Solvents, and Elastomers reporting units within the Performance Materials reportable segment, and determined at that time that no impairment existed. As discussed in Note B, Ashland sold the Elastomers division on December 1, 2014 and as a result, Elastomers is no longer a reporting unit as of December 31, 2014.
Finite-Lived Intangible Asset Policy	Intangible assets principally consist of trademarks and trade names, intellectual property, customer relationships, and in-process research and development (IPR&D). 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 4 to 25 years, intellectual property over 5 to 20 years, and customer relationships over 3 to 24 years.
Goodwill and Intangible Assets, Intangible Assets, Indefinite-Lived, Policy	IPR&D and certain intangible assets within trademarks and trade names have been classified as indefinite-lived and had a balance of $322 million as of December 31, 2014 and September 30, 2014, respectively. 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_CONTINGE1

LITIGATION, CLAIMS AND CONTINGENCIES (Policies)	3 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Policy	Ashland and Hercules, a wholly-owned subsidiary of Ashland that was acquired in 2009, 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, 2014
Earnings Per Share [Abstract]
Earnings Per Share Policy	The following is the computation of basic and diluted earnings per share (EPS) from continuing operations.  Stock appreciation rights (SARs) 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 1.2 million and 0.6 million at December 31, 2014 and 2013, respectively.  Earnings per share is reported under the treasury stock method.

STOCK_INCENTIVE_PLANS_Policies

STOCK INCENTIVE PLANS (Policies)	3 Months Ended
	Dec. 31, 2014
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-settled stock appreciation rights (SARs), performance share 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_INFORMATION1

REPORTABLE SEGMENT INFORMATION (Policies)	3 Months Ended
	Dec. 31, 2014
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 and does not aggregate operating segments to arrive at these reportable segments. Subsequent to the sale of Water Technologies and a business realignment during 2014, Ashland’s businesses are managed within three reportable segments:  Specialty Ingredients, Performance Materials and Valvoline.

DISCONTINUED_OPERATIONS_Tables

DISCONTINUED OPERATIONS (Tables)	3 Months Ended
	Dec. 31, 2014
Discontinued Operations and Disposal Groups [Abstract]
Components of Amounts in the Statements of Consolidated Income Related To Discontinued Operations	Components of amounts reflected in the Statements of Consolidated Comprehensive Income related to discontinued operations are presented in the following table for the three months ended December 31, 2014 and 2013.
		Three months ended
		31-Dec
	(In millions)	2014			2013
	Income (loss) from discontinued operations (net of tax)
	Asbestos-related litigation	$	(1	)	$	(1	)
	Water Technologies (a)	(3		)	23
	Loss on disposal of discontinued operations (net of tax)
	Water Technologies	(4		)	—
	Total income (loss) from discontinued operations (net of tax)	$	(8	)	$	22
	(a)	For the three months ended December 31, 2013, pretax operating income recorded for Water Technologies was $36 million.

RESTRUCTURING_ACTIVITIES_Table

RESTRUCTURING ACTIVITIES (Tables)	3 Months Ended
	Dec. 31, 2014
Restructuring and Related Activities [Abstract]
Restructuring Cost and Reserve	The following table summarizes the related activity in these reserves for the three months ended December 31, 2014 and 2013.  The severance reserves are included in accrued expenses and other liabilities while facility costs reserves are primarily within other noncurrent liabilities in the Condensed Consolidated Balance Sheets.
					Facility
	(In millions)	Severance			costs			Total
	Balance as of September 30, 2014	$	56		$	9		$	65
	Utilization (cash paid or otherwise settled)	(15		)	(1		)	(16		)
	Balance at December 31, 2014	$	41		$	8		$	49
	Balance as of September 30, 2013	$	17		$	8		$	25
	Reserve adjustments	1			—			1
	Utilization (cash paid or otherwise settled)	(4		)	(1		)	(5		)
	Balance at December 31, 2013	$	14		$	7		$	21

FAIR_VALUE_MEASUREMENTS_Tables

FAIR VALUE MEASUREMENTS (Tables)	3 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value of Asset Instruments	The following table summarizes financial instruments subject to recurring fair value measurements as of December 31, 2014.
	(In millions)	Carrying				Total			Quoted prices		Significant		Significant
		value				fair			in active		other		unobservable
						value			markets for		observable		inputs
									identical		inputs		Level 3
									assets		Level 2
									Level 1
	Assets
	Cash and cash equivalents	$	1,256			$	1,256		$	1,256	$	—	$	—
	Deferred compensation investments (a)	186				186			44		142		—
	Investments of captive insurance company (a)	3				3			3		—		—
	Foreign currency derivatives	3				3			—		3		—
	Total assets at fair value	$	1,448			$	1,448		$	1,303	$	145	$	—
	Liabilities
	Foreign currency derivatives	$	6			$	6		$	—	$	6	$	—
	(a)	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, 2014.
	(In millions)	Carrying				Total			Quoted prices		Significant		Significant
		value				fair			in active		other		unobservable
						value			markets for		observable		inputs
									identical		inputs		Level 3
									assets		Level 2
									Level 1
	Assets
	Cash and cash equivalents	$	1,393			$	1,393		$	1,393	$	—	$	—
	Deferred compensation investments (a)	184				184			45		139		—
	Investments of captive insurance company (a)	3				3			3		—		—
	Foreign currency derivatives	11				11			—		11		—
	Total assets at fair value	$	1,591			$	1,591		$	1,441	$	150	$	—
	Liabilities
	Foreign currency derivatives	$	9			$	9		$	—	$	9	$	—
	(a)	Included in other noncurrent assets in the Condensed Consolidated Balance Sheets.
Summary of gains (losses) on foreign currency derivatives	The following table summarizes the gains and losses recognized during the three months ended December 31, 2014 and 2013 within the Statements of Consolidated Comprehensive Income.
		Three months ended
		December 31
	(In millions)	2014				2013
	Foreign currency derivative gain (loss)	$	(4	)		$	3
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, 2014 and September 30, 2014 included in accounts receivable and accrued expenses and other liabilities of the Condensed Consolidated Balance Sheets.
		December 31				September 30
	(In millions)	2014				2014
	Foreign currency derivative assets	$	1			$	2
	Notional contract values	59				88
	Foreign currency derivative liabilities	$	4			$	4
	Notional contract values	335				281
Fair value of the outstanding net investment hedges	The following table summarizes the fair value of the outstanding net investment hedge instruments as of December 31, 2014 and September 30, 2014.
			December 31				September 30
	(In millions)	Consolidated balance sheet caption	2014				2014
	Net investment hedge assets	Accounts receivable	$	2			$	9
	Net investment hedge liabilities	Accrued expenses and other liabilities	2				5
Summary of unrealized gain on net investment hedges	The following table summarizes the unrealized gain on the net investment hedge instruments recognized within the cumulative translation adjustment within AOCI during the three months ended December 31, 2014. No portion of the loss was reclassified to income during the quarter.
	Three months ended
		December 31
	(In millions)	2014
	Change in unrealized gain in AOCI	$	—		(a)
	Tax impact of change in unrealized gain in AOCI	(1		)

INVENTORIES_Tables

INVENTORIES (Tables)	3 Months Ended
	Dec. 31, 2014
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)	2014			2014
	Finished products	$	539		$	557
	Raw materials, supplies and work in process	259			239
	LIFO reserve	(52		)	(31		)
		$	746		$	765

GOODWILL_AND_OTHER_INTANGIBLES2

GOODWILL AND OTHER INTANGIBLES (Tables)	3 Months Ended
	Dec. 31, 2014
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, 2014.
		Specialty			Performance
	(In millions)	Ingredients			Materials			(a)	Valvoline		Total
	Balance at September 30, 2014	$	2,129		$	346			$	168	$	2,643
	Divestiture	—			(10		)		—		(10		)
	Currency translation adjustment	(41		)	(6		)		—		(47		)
	Balance at December 31, 2014	$	2,088		$	330			$	168	$	2,586
	(a)	As of December 31, 2014, goodwill consisted of $172 million for the Intermediates/Solvents reporting unit and $158 million for the Composites reporting unit.
Intangible Assets	Intangible assets were comprised of the following as of December 31, 2014 and September 30, 2014.
		December 31, 2014
		Gross							Net
		carrying			Accumulated				carrying
	(In millions)	amount			amortization				amount
	Definite-lived intangible assets
	Trademarks and trade names (a)	$	66		$	(45	)		$	21
	Intellectual property (a)	809			(233		)		576
	Customer relationships	461			(126		)		335
	Total definite-lived intangible assets	1,336			(404		)		932
	Indefinite-lived intangible assets
	IPR&D	19			—				19
	Trademarks and trade names	303			—				303
	Total intangible assets	$	1,658		$	(404	)		$	1,254
	(a)	Elastomers had a gross carrying amount for trademarks/trade names and intellectual property of $6 million and $18 million, respectively, with $5 million of accumulated amortization for each caption.
		September 30, 2014
		Gross							Net
		carrying			Accumulated				carrying
	(In millions)	amount			amortization				amount
	Definite-lived intangible assets
	Trademarks and trade names	$	72		$	(49	)		$	23
	Intellectual property	827			(226		)		601
	Customer relationships	481			(118		)		363
	Total definite-lived intangible assets	1,380			(393		)		987
	Indefinite-lived intangible assets
	IPR&D	19			—				19
	Trademarks and trade names	303			—				303
	Total intangible assets	$	1,702		$	(393	)		$	1,309

DEBT_Tables

DEBT (Tables)	3 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Summary of Debt	The following table summarizes Ashland’s current and long-term debt as of the reported Condensed Consolidated Balance Sheet dates.
		December 31			September 30
	(In millions)	2014			2014
	4.750% notes, due 2022	$	1,120		$	1,120
	3.875% notes, due 2018	700			700
	3.000% notes, due 2016	600			600
	6.875% notes, due 2043	376			376
	Accounts receivable securitization (a)	220			255
	6.50% junior subordinated notes, due 2029	134			134
	Revolving credit facility	80			45
	Other international loans, interest at a weighted-
	average rate of 7.0% at December 31, 2014 (6.0% to 10.2%)	23			29
	Medium-term notes, due 2015-2019, interest at a weighted-
	average rate of 8.7% at December 31, 2014 (8.4% to 9.4%)	14			14
	Other	8			7
	Total debt	3,275			3,280
	Short-term debt	(323		)	(329		)
	Current portion of long-term debt	(9		)	(9		)
	Long-term debt (less current portion)	$	2,943		$	2,942
	(a)	During the three months ended December 31, 2014, the potential funding for qualified receivables was reduced from $275 million to $250 million.

INCOME_TAXES_Tables

INCOME TAXES (Tables)	3 Months Ended
	Dec. 31, 2014
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, 2014.
	(In millions)
	Balance at October 1, 2014	$	155
	Increases related to positions taken on items from prior years	1
	Decreases related to positions taken on items from prior years	(1		)
	Increases related to positions taken in the current year	7
	Balance at December 31, 2014	$	162

EMPLOYEE_BENEFIT_PLANS_Tables

EMPLOYEE BENEFIT PLANS (Tables)	3 Months Ended
	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Employee Benefit Plans	The following table details the components of pension and other postretirement benefit costs for both continuing and discontinued operations.
								Other postretirement
		Pension benefits						benefits
	(In millions)	2014			2013			2014			2013
	Three months ended December 31
	Service cost (a)	$	7		$	11		$	—		$	—
	Interest cost	44			49			2			2
	Expected return on plan assets	(54		)	(59		)	—			—
	Amortization of prior service credit	(1		)	(1		)	(4		)	(5		)
		$	(4	)	$	—		$	(2	)	$	(3	)
	(a)	Service cost and net pension benefit costs of $0 denote values less than $1 million.

LITIGATION_CLAIMS_AND_CONTINGE2

LITIGATION, CLAIMS AND CONTINGENCIES (Tables)	3 Months Ended
	Dec. 31, 2014
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 contingencies and asset retirement obligations during the three months ended December 31, 2014 and 2013.
		Three months ended
		31-Dec
	(In millions)	2014				2013
	Reserve - beginning of period	$	197			$	211
	Disbursements, net of cost recoveries	(8		)		(8		)
	Revised obligation estimates and accretion	6				5
	Reserve - end of period	$	195			$	208
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, 2014 and 2013.
		Three months ended
		31-Dec
	(In millions)	2014				2013
	Environmental expense	$	5			$	4
	Accretion	1				1
	Legal expense	1				—
	Total expense	7				5
	Insurance receivable	—				(1		)
	Total expense, net of receivable activity (a)	$	7			$	4
	(a)	Net expense of $1 million for the three months ended December 31, 2013 relates to divested businesses which qualified for treatment as discontinued operations and for which certain environmental liabilities were retained by Ashland.  These amounts are classified within the income from discontinued operations caption of the Statements of Consolidated Comprehensive Income.
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)	2014			2013			2014			2013		2012
	Open claims - beginning of period	65			65			65			66		72
	New claims filed	1			1			2			2		2
	Claims settled	—			—			(1	)		(1	)	(1	)
	Claims dismissed	—			—			(1	)		(2	)	(7	)
	Open claims - end of period	66			66			65			65		66
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)	2014				2013				2014			2013			2012
	Asbestos reserve - beginning of period	$	438			$	463			$	463		$	522		$	543
	Reserve adjustment	—				—				4			(28		)	11
	Amounts paid	(7		)		(8		)		(29		)	(31		)	(32		)
	Asbestos reserve - end of period	$	431			$	455			$	438		$	463		$	522
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)	2014				2013				2014			2013			2012
	Insurance receivable - beginning of period	$	402			$	408			$	408		$	423		$	431
	Receivable adjustment	—				—				22			(3		)	19
	Amounts collected	(10		)		(3		)		(28		)	(12		)	(27		)
	Insurance receivable - end of period	$	392			$	405			$	402		$	408		$	423
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)	2014			2013			2014			2013		2012
	Open claims - beginning of period	21			21			21			21		21
	New claims filed	—			—			1			1		1
	Claims dismissed	—			—			(1	)		(1	)	(1	)
	Open claims - end of period	21			21			21			21		21
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)	2014				2013				2014			2013			2012
	Asbestos reserve - beginning of period	$	329			$	342			$	342		$	320		$	311
	Reserve adjustment	—				—				10			46			30
	Amounts paid	(5		)		(5		)		(23		)	(24		)	(21		)
	Asbestos reserve - end of period	$	324			$	337			$	329		$	342		$	320
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)	2014				2013				2014			2013			2012
	Insurance receivable - beginning of period	$	77			$	75			$	75		$	56		$	48
	Receivable adjustment	—				—				3			19			9
	Amounts collected	—				—				(1		)	—			(1		)
	Insurance receivable - end of period	$	77			$	75			$	77		$	75		$	56

EARNINGS_PER_SHARE_Tables

EARNINGS PER SHARE (Tables)	3 Months Ended
	Dec. 31, 2014
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.  Stock appreciation rights (SARs) 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 1.2 million and 0.6 million at December 31, 2014 and 2013, respectively.  Earnings per share is reported under the treasury stock method.
		Three months ended
		31-Dec
	(In millions except per share data)	2014		2013
	Numerator
	Numerator for basic and diluted EPS – Income
	from continuing operations	$	40	$	88
	Denominator
	Denominator for basic EPS – Weighted-average
	common shares outstanding	69		77
	Share-based awards convertible to common shares	1		1
	Denominator for diluted EPS – Adjusted weighted-
	average shares and assumed conversions	70		78
	EPS from continuing operations
	Basic	$	0.58	$	1.14
	Diluted	0.57		1.12

STOCKHOLDERS_EQUITY_ITEMS_Tabl

STOCKHOLDERS' EQUITY ITEMS (Tables)	3 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Schedule of Comprehensive Income (Loss) [Table Text Block]	Components of other comprehensive income recorded in the Statements of Consolidated Comprehensive Income are presented below, before tax and net of tax effects.
		2014									2013
					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)	$	(126	)	$	(1	)	$	(127	)	$	39		$	—	$	39
	Pension and postretirement obligation adjustment:
	Amortization of unrecognized prior service
	credits included in net income (a)	(5		)	—			(5		)	(6		)	2		(4		)
	Total other comprehensive income (loss)	$	(131	)	$	(1	)	$	(132	)	$	33		$	2	$	35
	(a)	Amortization of unrecognized prior service credits are included in the calculation of net periodic benefit costs (income) for pension and other postretirement plans. For specific financial statement captions impacted by the amortization see the table below.
Income Statement Location of Prior Service Credits Recognized in Accumulated Other Comprehensive Income [Table Text Block]	The captions on the Statements of Consolidated Comprehensive Income impacted by the amortization of unrecognized prior service credits for pension and other postretirement plans are disclosed below. See Note J for more information.
		Three months ended
		31-Dec
	(In millions)	2014			2013
	Cost of sales	$	(2	)	$	(2	)
	Selling, general and administrative expense	(3		)	(3		)
	Discontinued operations	—			(1		)
	Total amortization of unrecognized prior service credits	$	(5	)	$	(6	)

REPORTABLE_SEGMENT_INFORMATION2

REPORTABLE SEGMENT INFORMATION (Tables)	3 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Reportable Segment Information	The following table presents various financial information for each reportable segment, reflective of the 2014 business realignment, for the three months ended December 31, 2014 and 2013.  As part of this realignment, historical financial results for both the Specialty Ingredients and Performance Materials reportable segments have been revised to account for this new alignment.
		Three months ended
		31-Dec
	(In millions - unaudited)	2014		2013
	SALES
	Specialty Ingredients	$	561	$	581
	Performance Materials	338		365
	Valvoline	492		486
		$	1,391	$	1,432
	OPERATING INCOME
	Specialty Ingredients	$	60	$	51
	Performance Materials	25		14
	Valvoline	83		75
	Unallocated and other (a)	1		3
		$	169	$	143
	(a)	As a result of the sale of Water Technologies, Unallocated and other is impacted by certain items related to discontinued operations accounting. For the three months ended December 31, 2013, Unallocated and other includes $9 million of costs previously charged to the Water Technologies business for primarily indirect corporate cost allocations that U.S. GAAP provisions require to be included within continuing operations. Additionally, a portion of the components of pension and other postretirement benefit costs other than service costs (i.e. interest cost, expected return on assets, and amortization of prior service credit) related to Water Technologies has been reclassified from the Unallocated and other segment to the discontinued operations caption of the Statements of Consolidated Comprehensive Income. Pension and other postretirement benefit income for the three months ended December 31, 2013 of $2 million was classified within discontinued operations.

SIGNIFICANT_ACCOUNTING_POLICIE2

SIGNIFICANT ACCOUNTING POLICIES (Details)	3 Months Ended
	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of reportable segments	3

DIVESTITURES_Details

DIVESTITURES (Details) (USD $)	3 Months Ended		12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2014	Nov. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue, Net	$1,391	$1,432	$6,100
Elastomers [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Entity Number of Employees	250
Percentage of Revenue by Product Category			5.00%
Sale of Business, Transaction Value	120
Proceeds from Divestiture of Businesses	106
Expected proceeds from divestiture	3
Assets, Net				191
Loss on sale of divested division, pre-tax	-85
Loss on sale of divested division, tax effect	28
Water Technologies [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale of Business, Transaction Value			1,800
Proceeds from Divestiture of Businesses			1,600
Expected proceeds from divestiture	48
Recognized transition service fees	9
Water Technologies [Member] | Selling, General and Administrative Expenses [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Indirect corporate costs previously allocated to divestiture		-9
Castings Solutions Joint Venture [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Sale of Equity Method Investments, Pre-tax			205
Proceeds from Sale of Equity Method Investments, Cash			176
Proceeds from Sale of Equity Method Investments, Note			29
Equity Method Investment, Ownership Percentage			50.00%
Performance Materials [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue, Net	$338	$365	$1,600
Performance Materials [Member] | Elastomers [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of Revenue by Product Category			18.00%

DISCONTINUED_OPERATIONS_Detail

DISCONTINUED OPERATIONS (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Discontinued Operations [Line Items]
Income (loss) from discontinued operations (net of tax)	($8)	$22
Water Technologies [Member]
Discontinued Operations [Line Items]
Sales of divested business		436
Income (loss) from discontinued operations (net of tax)	-3	23	[1]
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	-4	0
Pretax income from divested business		36
Asbestos [Member]
Discontinued Operations [Line Items]
Income (loss) from discontinued operations (net of tax)	($1)	($1)
[1]	For the three months ended December 31, 2013, pretax operating income recorded for Water Technologies was $36 million.

RESTRUCTURING_ACTIVITIES_Detai

RESTRUCTURING ACTIVITIES (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2014
Restructuring reserve [Roll Forward]
Restructuring reserve balance, beginning of period	$65	$25
Reserve adjustments		1
Utilization (cash paid or otherwise settled)	-16	-5
Restructuring reserve balance, end of period	49	21
Severance [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve balance, beginning of period	56	17
Reserve adjustments		1
Utilization (cash paid or otherwise settled)	-15	-4
Restructuring reserve balance, end of period	41	14
Facility Costs [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve balance, beginning of period	9	8
Reserve adjustments		0
Utilization (cash paid or otherwise settled)	-1	-1
Restructuring reserve balance, end of period	8	7
2014 Voluntary Severance Offer [Member] | Severance [Member]
Restructuring Cost and Reserve [Line Items]
Number of employees approved for VSO		400
2014 Combined Voluntary and Involuntary Severance Offers [Member] | Severance [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve balance, beginning of period			53
Restructuring reserve balance, end of period	38		53
Other Restructuring [Member] | Severance [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve balance, beginning of period			3
Restructuring reserve balance, end of period	$3		$3

FAIR_VALUE_MEASUREMENTS_Recurr

FAIR VALUE MEASUREMENTS (Recurring Basis) (Details) (Fair Value, Measurements, Recurring [Member], USD $)	Dec. 31, 2014		Sep. 30, 2014
In Millions, unless otherwise specified
Carrying (Reported) Amount, Fair Value Disclosure [Member]
ASSETS
Cash and cash equivalents	$1,256		$1,393
Deferred compensation investments	186	[1]	184	[1]
Investments of captive insurance company	3	[1]	3	[1]
Foreign currency derivatives	3		11
Total assets at fair value	1,448		1,591
LIABILITIES
Foreign currency derivatives	6		9
Estimate of Fair Value, Fair Value Disclosure [Member]
ASSETS
Cash and cash equivalents	1,256		1,393
Deferred compensation investments	186	[1]	184	[1]
Investments of captive insurance company	3	[1]	3	[1]
Foreign currency derivatives	3		11
Total assets at fair value	1,448		1,591
LIABILITIES
Foreign currency derivatives	6		9
Fair Value, Inputs, Level 1 [Member]
ASSETS
Cash and cash equivalents	1,256		1,393
Deferred compensation investments	44	[1]	45	[1]
Investments of captive insurance company	3	[1]	3	[1]
Foreign currency derivatives	0		0
Total assets at fair value	1,303		1,441
LIABILITIES
Foreign currency derivatives	0		0
Fair Value, Inputs, Level 2 [Member]
ASSETS
Cash and cash equivalents	0		0
Deferred compensation investments	142	[1]	139	[1]
Investments of captive insurance company	0	[1]	0	[1]
Foreign currency derivatives	3		11
Total assets at fair value	145		150
LIABILITIES
Foreign currency derivatives	6		9
Fair Value, Inputs, Level 3 [Member]
ASSETS
Cash and cash equivalents	0		0
Deferred compensation investments	0	[1]	0	[1]
Investments of captive insurance company	0	[1]	0	[1]
Foreign currency derivatives	0		0
Total assets at fair value	0		0
LIABILITIES
Foreign currency derivatives	$0		$0
[1]	Included in other noncurrent assets in the Condensed Consolidated Balance Sheets.

FAIR_VALUE_MEASUREMENTS_Curren

FAIR VALUE MEASUREMENTS (Currency Hedges) (Details) (Foreign Exchange Contract [Member], USD $)	3 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013	Sep. 30, 2014
Not Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency derivative gain (loss)	($4)		$3
Not Designated as Hedging Instrument [Member] | Accounts Receivable [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency derivative assets	1			2
Notional amounts, foreign currency derivatives	59			88
Not Designated as Hedging Instrument [Member] | Accrued Expenses and Other Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency derivative liabilities	4			4
Notional amounts, foreign currency derivatives	335			281
Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional amounts, foreign currency derivatives	197			206
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	0	[1]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	-1
Loss on Fair Value Hedge Ineffectiveness	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	0
Designated as Hedging Instrument [Member] | Accounts Receivable [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency derivative assets	2			9
Designated as Hedging Instrument [Member] | Accrued Expenses and Other Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency derivative liabilities	$2			$5
[1]	Denotes a value that nets to less than $1 million.

FAIR_VALUE_MEASUREMENTS_Other_

FAIR VALUE MEASUREMENTS (Other Financial Instruments) (Details) (USD $)	Dec. 31, 2014	Sep. 30, 2014
In Millions, unless otherwise specified
Other financial instruments [Abstract]
Long-term Debt, Carrying Value	$2,952	$2,951
Long-term Debt, Fair Value	$3,132	$3,102

INVENTORIES_Details

INVENTORIES (Details) (USD $)	Dec. 31, 2014	Sep. 30, 2014
In Millions, unless otherwise specified
Inventory Disclosure [Abstract]
Finished products	$539	$557
Raw materials, supplies and work in process	259	239
LIFO reserve	-52	-31
Inventory, Net	$746	$765

GOODWILL_AND_OTHER_INTANGIBLES3

GOODWILL AND OTHER INTANGIBLES (Goodwill) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Goodwill [Line Items]
Goodwill impairment	$0
Goodwill [Roll Forward]
Balance at beginning of period	2,643
Divestiture	-10
Currency translation adjustment	-47
Balance at end of period	2,586
Specialty Ingredients [Member]
Goodwill [Roll Forward]
Balance at beginning of period	2,129
Divestiture	0
Currency translation adjustment	-41
Balance at end of period	2,088
Performance Materials [Member]
Goodwill [Roll Forward]
Balance at beginning of period	346
Divestiture	-10
Currency translation adjustment	-6
Balance at end of period	330	[1]
Valvoline [Member]
Goodwill [Roll Forward]
Balance at beginning of period	168
Divestiture	0
Currency translation adjustment	0
Balance at end of period	168
Performance Materials Intermediates and Solvents Reporting Unit [Member]
Goodwill [Roll Forward]
Balance at end of period	172
Performance Materials Composite Polymers Reporting Unit [Member]
Goodwill [Roll Forward]
Balance at end of period	$158
[1]	As of December 31, 2014, goodwill consisted of $172 million for the Intermediates/Solvents reporting unit and $158 million for the Composites reporting unit.

GOODWILL_AND_OTHER_INTANGIBLES4

GOODWILL AND OTHER INTANGIBLES (Other Intangible Assets) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013	Sep. 30, 2014
Intangible Assets, Net [Abstract]
Intangible Assets, Gross (Excluding Goodwill)	$1,658			$1,702
Intangible Assets, Net (Excluding Goodwill)	1,254			1,309
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	1,336			1,380
Accumulated amortization	-404			-393
Net carrying amount	932			987
Amortization expense recognized on intangible assets	21		22
Expected future amortization expense [Abstract]
2015 (includes three months actual and nine months estimated)	82
2016	80
2017	80
2018	79
2019	75
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
Indefinite-lived intangible assets (excluding goodwill)	322			322
In Process Research and Development [Member]
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
Indefinite-lived intangible assets (excluding goodwill)	19			19
Trademarks and Trade Names [Member]
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
Indefinite-lived intangible assets (excluding goodwill)	303			303
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	66	[1]		72
Accumulated amortization	-45	[1]		-49
Net carrying amount	21	[1]		23
Trademarks and Trade Names [Member] | Elastomers [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	6
Accumulated amortization	-5
Intellectual Property [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	809	[1]		827
Accumulated amortization	-233	[1]		-226
Net carrying amount	576	[1]		601
Intellectual Property [Member] | Elastomers [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	18
Accumulated amortization	-5
Customer Relationships [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	461			481
Accumulated amortization	-126			-118
Net carrying amount	$335			$363
Minimum [Member] | Trademarks and Trade Names [Member]
Intangible Assets, Net [Abstract]
Useful life (in years)	4 years
Minimum [Member] | Intellectual Property [Member]
Intangible Assets, Net [Abstract]
Useful life (in years)	5 years
Minimum [Member] | Customer 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)	20 years
Maximum [Member] | Customer Relationships [Member]
Intangible Assets, Net [Abstract]
Useful life (in years)	24 years
[1]	Elastomers had a gross carrying amount for trademarks/trade names and intellectual property of $6 million and $18 million, respectively, with $5 million of accumulated amortization for each caption.

DEBT_Details

DEBT (Details) (USD $)	3 Months Ended		12 Months Ended
	Dec. 31, 2014		Sep. 30, 2014
Debt Instrument [Line Items]
Total debt	$3,275,000,000		$3,280,000,000
Short-term debt	-323,000,000		-329,000,000
Current portion of long-term debt	-9,000,000		-9,000,000
Long-term debt (less current portion)	2,943,000,000		2,942,000,000
Scheduled aggregate debt maturities by fiscal year [Abstract]
2015	251,000,000
2016	600,000,000
2017	0
2018	780,000,000
2019	5,000,000
Notes due 2022 [Member]
Debt Instrument [Line Items]
Total debt	1,120,000,000		1,120,000,000
Interest rate	4.75%		4.75%
Debt instrument maturity	15-Aug-22		15-Aug-22
Notes due 2018 [Member]
Debt Instrument [Line Items]
Total debt	700,000,000		700,000,000
Interest rate	3.88%		3.88%
Debt instrument maturity	15-Apr-18		15-Apr-18
Notes due 2016 [Member]
Debt Instrument [Line Items]
Total debt	600,000,000		600,000,000
Interest rate	3.00%		3.00%
Debt instrument maturity	15-Mar-16		15-Mar-16
Notes due 2043 [Member]
Debt Instrument [Line Items]
Total debt	376,000,000		376,000,000
Interest rate	6.88%		6.88%
Debt instrument maturity	15-May-43		15-May-43
Accounts Receivable Securitization [Member]
Debt Instrument [Line Items]
Total debt	220,000,000	[1]	255,000,000	[1]
Debt Instrument, Face Amount	250,000,000		275,000,000
Borrowing capacity	0
Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Total debt	134,000,000		134,000,000
Interest rate	6.50%		6.50%
Debt instrument maturity	31-Dec-29		31-Dec-29
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total debt	80,000,000		45,000,000
Revolving credit facility	1,200,000,000
Borrowing capacity	1,047,000,000
Letters of credit outstanding	73,000,000
Covenant restrictions [Abstract]
Maximum consolidated leverage ratio	3.25
Calculated leverage ratio	2
Minimum required consolidated interest coverage ratio	3
Calculated consolidated interest coverage ratio	6.5
Other International Loans [Member]
Debt Instrument [Line Items]
Total debt	23,000,000		29,000,000
Debt, Weighted Average Interest Rate	6.99%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum	6.00%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum	10.15%
Medium-term Notes [Member]
Debt Instrument [Line Items]
Total debt	14,000,000		14,000,000
Debt, Weighted Average Interest Rate	8.74%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum	8.38%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum	9.35%
Debt instrument maturity range, start	31-Dec-15		31-Dec-15
Debt instrument maturity range, end	31-Dec-19		31-Dec-19
Other Notes [Member]
Debt Instrument [Line Items]
Total debt	$8,000,000		$7,000,000
[1]	During the three months ended December 31, 2014, the potential funding for qualified receivables was reduced from $275 million to $250 million

INCOME_TAXES_Details

INCOME TAXES (Details) (USD $)	3 Months Ended		12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2014
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount [Abstract]
Estimated Annual Effective Interest Rate	24.60%		21.10%
Effective tax rate (in hundredths)	7.00%	17.00%
Effective Income Tax Rate Reconciliation, Tax Benefit, Key Item Charges	$31
Other Key Item Charges	93
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Key Items Amount		5
Change in Unrecognized Tax Benefits [Roll Forward]
Balance	155
Increases related to positions taken on items from prior years	1
Decreases related to positions taken on items from prior years	-1
Increases related to positions taken in the current year	7
Balance	162		155
Segment, Continuing Operations [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Expected decrease in the amount accrued for uncertain tax positions	17
Discontinued Operations [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Expected decrease in the amount accrued for uncertain tax positions	13
Minimum [Member]
Valuation Allowance [Line Items]
Operating Loss Carryforwards, Valuation Allowance	20
Maximum [Member]
Valuation Allowance [Line Items]
Operating Loss Carryforwards, Valuation Allowance	$30

EMPLOYEE_BENEFIT_PLANS_Details

EMPLOYEE BENEFIT PLANS (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual contributions to benefit plans in period	$4
Estimated future contributions in current fiscal year	76
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	13
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	7		11
Interest cost	44		49
Expected return on plan assets	-54		-59
Amortization of prior service credit	-1		-1
Total net periodic benefit cost	-4		0
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	0	[1]	0	[1]
Interest cost	2		2
Expected return on plan assets	0		0
Amortization of prior service credit	-4		-5
Total net periodic benefit cost	-2		-3
Unallocated and other [Member] | Income (Loss) From Discontinued Operations [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Total net periodic benefit cost			($2)
[1]	Service cost and net pension benefit costs of $0 denote values less than $1 million.

LITIGATION_CLAIMS_AND_CONTINGE3

LITIGATION, CLAIMS AND CONTINGENCIES (Asbestos Litigation) (Details) (USD $)	3 Months Ended			9 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013	Jun. 30, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
	claim	claim	claim	claim	claim	claim	claim
Asbestos reserve [Roll Forward]
Litigation Settlement, Expected Amount	$398
Increase (decrease) in receivable due to litigation settlement, Estimated	-250
Asbestos litigation cost projection [Abstract]
Possible total future litigation defense and claim settlement costs	1,500
Minimum [Member]
Asbestos reserve [Roll Forward]
Gain (Loss) Related to Litigation Settlement, Expected Amount	110
Asbestos litigation cost projection [Abstract]
Number of Years Included in Asbestos Assumption	40 years
Maximum [Member]
Asbestos reserve [Roll Forward]
Gain (Loss) Related to Litigation Settlement, Expected Amount	130
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	65,000		65,000	65,000	65,000	66,000	72,000
New claims filed	1,000		1,000		2,000	2,000	2,000
Claims settled	0		0		-1,000	-1,000	-1,000
Claims dismissed	0		0		-1,000	-2,000	-7,000
Open claims - end of period	66,000	65,000	66,000		65,000	65,000	66,000
Asbestos reserve [Roll Forward]
Asbestos reserve - beginning of period	438		463	463	463	522	543
Reserve adjustment	0		0		4	-28	11
Amounts paid	-7		-8		-29	-31	-32
Asbestos reserve - end of period	431	438	455		438	463	522
Estimated percentage of insurance receivables that are domestic insurers (in hundredths)	70.00%
Percentage Of Domestic Insurers With A B Plus Credit Rating Or Higher	100.00%
Insurance receivables relating to costs previously paid	80
Insurance receivable [Roll Forward]
Insurance receivable - beginning of period	402		408	408	408	423	431
Receivable adjustment	0	15	0	7	22	-3	19
Amounts collected	-10		-3		-28	-12	-27
Insurance receivable - end of period	392	402	405		402	408	423
Asbestos litigation cost projection [Abstract]
Possible total future litigation defense and claim settlement costs	870
Hercules [Member]
Asbestos claims [Roll Forward]
Open claims - beginning of period	21,000		21,000	21,000	21,000	21,000	21,000
New claims filed	0		0		1,000	1,000	1,000
Claims dismissed	0		0		-1,000	-1,000	-1,000
Open claims - end of period	21,000	21,000	21,000		21,000	21,000	21,000
Asbestos reserve [Roll Forward]
Asbestos reserve - beginning of period	329		342	342	342	320	311
Reserve adjustment	0		0		10	46	30
Amounts paid	-5		-5		-23	-24	-21
Asbestos reserve - end of period	324	329	337		329	342	320
Percentage Of Domestic Insurers With A B Plus Credit Rating Or Higher	100.00%
Insurance receivable [Roll Forward]
Insurance receivable - beginning of period	77		75	75	75	56	48
Receivable adjustment	0		0		3	19	9
Amounts collected	0		0		-1	0	-1
Insurance receivable - end of period	77	77	75		77	75	56
Asbestos litigation cost projection [Abstract]
Possible total future litigation defense and claim settlement costs	$670

LITIGATION_CLAIMS_AND_CONTINGE4

LITIGATION, CLAIMS AND CONTINGENCIES (Environmental Remediation and Asset Retirement Obligations) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Sep. 30, 2014
	waste_treatment_or_disposal_sites
	disposal_site
	service_station_property
Environmental remediation and asset retirement obligations [Abstract]
Number of waste treatment or disposal sites were company is identified as a potentially responsible party under the superfund or similar state laws	81
Number of current and former operating facilities subject to various environmental laws.	139
Total number of service station properties subject to various environmental laws	1,225
Number of service stations being actively remediated	82
Noncurrent environmental reserves	$156				$158
Environmental receivables from insurers	23				24
Environmental contingencies and asset retirement obligation [Roll Forward]
Reserve - beginning of period	197		211
Disbursements, net of cost recoveries	-8		-8
Revised obligation estimates and accretion	6		5
Reserve - end of period	195		208
Environmental Remediation Costs Recognized [Abstract]
Environmental expense	5		4
Accretion	1		1
Legal Fees	1		0
Total expense	7		5
Insurance receivable	0		-1
Total expense, net of receivable activity	7	[1]	4	[1]
Net expense related to divested businesses			1
Maximum future environmental remediation costs for identified sites	$430
Maximum reserve for remediation reserve related to any one site (in hundredths)	13.00%
[1]	Net expense of $1 million for the three months ended December 31, 2013 relates to divested businesses which qualified for treatment as discontinued operations and for which certain environmental liabilities were retained by Ashland. These amounts are classified within the income from discontinued operations caption of the Statements of Consolidated Comprehensive Income.

EARNINGS_PER_SHARE_Details

EARNINGS PER SHARE (Details) (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Abstract]
Antidilutive securities excluded from calculation of earnings per share	1.2	0.6
Numerator [Abstract]
Numerator for basic and diluted EPS - Income from continuing operations	$40	$88
Denominator [Abstract]
Denominator for basic EPS - Weighted-average common shares outstanding	69	77
Share based awards convertible to common shares	1	1
Denominator for diluted EPS - Adjusted weighted-average shares and assumed conversions	70	78
EPS from continuing operations [Abstract]
Basic (in usd per share)	$0.58	$1.14
Diluted (in usd per share)	$0.57	$1.12

STOCKHOLDERS_EQUITY_ITEMS_Deta

STOCKHOLDERS' EQUITY ITEMS (Details) (USD $)	3 Months Ended							12 Months Ended		6 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014		Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013		Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2014
Other Comprehensive Income (Loss) [Line Items]
Unrealized translation gain (loss), before tax	($126)					$39
Unrealized translation gain (loss), tax	-1					0
Unrealized translation gain (loss), net of tax	-127					39
Amortization of unrecognized prior service credits included in net income (loss), before tax	-5	[1]				-6	[1]
Amortization of unrecognized prior service credits included in net income (loss), tax	0					2
Amortization of unrecognized prior service credits included in net income (loss), net of tax	-5					-4
Other comprehensive income (loss), before tax	-131					33
Other comprehensive income (loss), tax	-1					2
Other comprehensive income (loss)	-132					35
Share Repurchase Program [Table] [Line Items]
Stock repurchase program, authorized amount								1,350	600
Stock repurchase program, remaining authorized repurchase amount	270								450
Payments for Repurchase of Common Stock	127					0
Dividends [Abstract]
Quarterly dividend (per share)	$0.34		$0.34	$0.34	$0.34	$0.34
10b5-1 Share Repurchase Program [Member]
Share Repurchase Program [Table] [Line Items]
Stock repurchase program, authorized amount								250
Payments for Repurchase of Common Stock	127									250
Stock Repurchased and Retired During Period, Shares	1.2									2.4
Share Repurchase, Final Price Paid per Share										$104.51
Accelerated Share Repurchase Program [Member]
Share Repurchase Program [Table] [Line Items]
Payments for Repurchase of Common Stock								750
Stock Repurchased and Retired During Period, Shares	0							5.9
Cost of Sales [Member]
Other Comprehensive Income (Loss) [Line Items]
Amortization of unrecognized prior service credits included in net income (loss), before tax	-2					-2
Selling, General and Administrative Expenses [Member]
Other Comprehensive Income (Loss) [Line Items]
Amortization of unrecognized prior service credits included in net income (loss), before tax	-3					-3
Discontinued Operations [Member]
Other Comprehensive Income (Loss) [Line Items]
Amortization of unrecognized prior service credits included in net income (loss), before tax	$0					($1)
[1]	Amortization of unrecognized prior service credits are included in the calculation of net periodic benefit costs (income) for pension and other postretirement plans. For specific financial statement captions impacted by the amortization see the table below.

STOCK_INCENTIVE_PLANS_Details

STOCK INCENTIVE PLANS (Details) (USD $)	3 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$14	$8
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unexercised SARs lapse expiration period	10 years 1 month
Grants of share-based payment awards in period	200,000	400,000
Total unrecognized compensation costs	15
Unrecognized cost expected to be recognized over a weighted-average period (in years)	2 years
Model to fair value share-based payment awards	Black-Scholes option-pricing model
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]
Grants of share-based payment awards in period	104,750	133,300
Total unrecognized compensation costs	20
Unrecognized cost expected to be recognized over a weighted-average period (in years)	2 years 1 month
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]
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost	7
Performance cycle covered by performance based awards	3 years
Number of common shares for each converted performance share	1
Grants of share-based payment awards in period	100,000	100,000
Total unrecognized compensation costs	$10
Unrecognized cost expected to be recognized over a weighted-average period (in years)	2 years 2 months

REPORTABLE_SEGMENT_INFORMATION3

REPORTABLE SEGMENT INFORMATION (Details) (USD $)	3 Months Ended				12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Sep. 30, 2014
Segment Reporting Information [Line Items]
Number of reportable segments	3
Sales	$1,391		$1,432		$6,100
OPERATING INCOME	169		143
Specialty Ingredients [Member]
Segment Reporting Information [Line Items]
Sales	561		581
OPERATING INCOME	60		51
Performance Materials [Member]
Segment Reporting Information [Line Items]
Sales	338		365		1,600
OPERATING INCOME	25		14
Valvoline [Member]
Segment Reporting Information [Line Items]
Number of Stores	930
Sales	492		486
OPERATING INCOME	83		75
Unallocated and other [Member]
Segment Reporting Information [Line Items]
OPERATING INCOME	1	[1]	3	[1]
Income (Loss) From Discontinued Operations [Member] | Unallocated and other [Member]
Segment Reporting Information [Line Items]
Net periodic benefit cost			-2
Water Technologies [Member] | Selling, General and Administrative Expenses [Member]
Segment Reporting Information [Line Items]
Indirect corporate costs previously allocated to divestiture			$9
[1]	As a result of the sale of Water Technologies, Unallocated and other is impacted by certain items related to discontinued operations accounting. For the three months ended December 31, 2013, Unallocated and other includes $9 million of costs previously charged to the Water Technologies business for primarily indirect corporate cost allocations that U.S. GAAP provisions require to be included within continuing operations. Additionally, a portion of the components of pension and other postretirement benefit costs other than service costs (i.e. interest cost, expected return on assets, and amortization of prior service credit) related to Water Technologies has been reclassified from the Unallocated and other segment to the discontinued operations caption of the Statements of Consolidated Comprehensive Income. Pension and other postretirement benefit income for the three months ended December 31, 2013 of $2 million was classified within discontinued operations.