Represents the aggregate purchase price of debt that was repurchased during a period.

No definition available.

Name:	ash_AggregatePurchasePriceOfDebt
Namespace Prefix:	ash_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Cash repatriation.

+ References

No definition available.

+ Details

Name:	ash_CashRepatriation
Namespace Prefix:	ash_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Consolidated interest coverage ratio.

+ References

No definition available.

+ Details

Name:	ash_ConsolidatedInterestCoverageRatio
Namespace Prefix:	ash_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Consolidated leverage ratio.

+ References

No definition available.

+ Details

Name:	ash_ConsolidatedLeverageRatio
Namespace Prefix:	ash_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure.

+ References

No definition available.

+ Details

Name:	ash_CovenantRestrictionsAbstract
Namespace Prefix:	ash_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt instrument amortization percentage.

+ References

No definition available.

+ Details

Name:	ash_DebtInstrumentAmortizationPercentage
Namespace Prefix:	ash_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt instrument maturity date extended month and year.

+ References

No definition available.

+ Details

Name:	ash_DebtInstrumentMaturityDateExtendedMonthAndYear
Namespace Prefix:	ash_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt instrument maturity year.

+ References

No definition available.

+ Details

Name:	ash_DebtInstrumentMaturityYear
Namespace Prefix:	ash_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the percentage points added to the variable rate on a debt instrument.

+ References

No definition available.

+ Details

Name:	ash_DebtInstrumentsPercentagePointsAddedToVariableRate
Namespace Prefix:	ash_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents debt issuance costs that did not qualify for capitalization and was therefore immediately expensed.

+ References

No definition available.

+ Details

Name:	ash_DebtIssuanceCostsImmediatelyRecognized
Namespace Prefix:	ash_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the sublimit on the revolving credit facility.

+ References

No definition available.

+ Details

Name:	ash_LineOfCreditFacilityLetterOfCreditSublimit
Namespace Prefix:	ash_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The maximum consolidated leverage ratio permitted under the debt instruments.

+ References

No definition available.

+ Details

Name:	ash_MaximumConsolidatedLeverageRatio
Namespace Prefix:	ash_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

The minimum required consolidated interest coverage ratio under the debt instruments.

+ References

No definition available.

+ Details

Name:	ash_MinimumConsolidatedInterestCoverageRatio
Namespace Prefix:	ash_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount of outstanding receivables that have been sold to an affiliate.

+ References

No definition available.

+ Details

Name:	ash_OutstandingAmountOfReceivablesSoldToAffiliate
Namespace Prefix:	ash_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the aggregate principal par value of debt repurchased.

+ References

No definition available.

+ Details

Name:	ash_ParValueOfDebtRepurchases
Namespace Prefix:	ash_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the reduction in the carrying value of debt during a period.

+ References

No definition available.

+ Details

Name:	ash_ReductionInCarryingValueOfDebt
Namespace Prefix:	ash_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Accelerated accretion of the recorded debt discount due to termination or repayment of debt.

+ References

No definition available.

+ Details

Name:	ash_RepaymentOfDebtAcceleratedAccretion
Namespace Prefix:	ash_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Accelerated amortization of previously capitalized debt issuance costs due to termination or repayment of debt.

+ References

No definition available.

+ Details

Name:	ash_RepaymentOfDebtAcceleratedAmortization
Namespace Prefix:	ash_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of short-term and long-term debt and lease obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13,16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

+ Details

Name:	us-gaap_DebtAndCapitalLeaseObligations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of the total principal payments made during the annual reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentAnnualPrincipalPayment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of gain (loss) from the difference between the repurchase price of a debt instrument initially issued by the entity and the net carrying amount of the debt at the time of its repurchase.

+ References

No definition available.

+ Details

Name:	us-gaap_GainLossOnRepurchaseOfDebtInstrument
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585

+ Details

Name:	us-gaap_PaymentsOfDebtIssuanceCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585

+ Details

Name:	us-gaap_RepaymentsOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_JuniorSubordinatedDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=ash_TwoThousandEighteenAssetBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_AssetBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=ash_TwoThousandEighteenAssetBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=ash_TwoThousandTwelveAssetBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=ash_A2017RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ash_TermLoanDue2020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ash_TermLoanADue2022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ash_A2017RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=ash_AlternateBaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ash_TermLoanBDue2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ash_A2015RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=us-gaap_MediumTermNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ash_SeniorNotesDue2018Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ash_NotesDue2022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ash_NotesDue2018Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ash_NotesDue2018And2022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ash_NotesDue2043Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ash_OtherDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt - Financing Activity and Covenants - Additional Information (Details)			1 Months Ended	3 Months Ended	12 Months Ended
	Jul. 31, 2018 EUR (€)	Aug. 31, 2012 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Aug. 30, 2019 USD ($)	Mar. 31, 2018 USD ($)	May 17, 2017 USD ($)
Debt Instrument [Line Items]
Payments of debt issuance costs						$ 2,000,000	$ 15,000,000
Repayment of debt, accelerated amortization							13,000,000
Cash repatriation					$ 900,000,000	590,000,000
Carrying value of debt			$ 1,513,000,000		1,513,000,000	2,307,000,000
Line of credit facility, remaining borrowing capacity			$ 800,000,000		$ 800,000,000
Covenant restrictions [Abstract]
Maximum consolidated leverage ratio			4.5		4.5
Consolidated net leverage ratio			2.6		2.6
Minimum required consolidated interest coverage ratio			3.0		3.0
Consolidated interest coverage ratio			6.1		6.1
Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date					Dec. 31, 2029
Debt instrument, interest rate, stated percentage			6.50%		6.50%
Debt instrument, maturity year					2029
Carrying value of debt			$ 54,000,000		$ 54,000,000	52,000,000
Gain (loss) on repurchase of debt instrument							5,000,000
Par value of debt repurchases				$ 182,000,000
Aggregate purchase price of debt				$ 177,000,000
Reduction in carrying value of debt							90,000,000
Repayment of debt, accelerated accretion							92,000,000
2018 Accounts Receivable Securitization [Member]
Debt Instrument [Line Items]
Debt instrument, outstanding amount			94,000,000		94,000,000	109,000,000
Outstanding amount of receivables sold to affiliate			$ 133,000,000		$ 133,000,000	$ 153,000,000
Debt, weighted average interest rate			1.20%		1.20%	1.80%
Accounts Receivable Securitization [Member]
Debt Instrument [Line Items]
Carrying value of debt			$ 144,000,000		$ 144,000,000	$ 195,000,000
Line of credit facility, remaining borrowing capacity			$ 48,000,000		48,000,000
2018 Accounts Receivable Securitization [Member]
Debt Instrument [Line Items]
Debt instrument, term	2 years
Line of credit facility, maximum borrowing capacity \| €	€ 115,000,000
Extended maturity period			2021-08
2012 Accounts Receivable Securitization [Member]
Debt Instrument [Line Items]
Debt instrument, outstanding amount			$ 50,000,000		50,000,000	86,000,000
Debt instrument, term		3 years
Line of credit facility, maximum borrowing capacity		$ 350,000,000					$ 100,000,000	$ 100,000,000	$ 115,000,000
Outstanding amount of receivables sold to affiliate			$ 147,000,000		$ 147,000,000	$ 166,000,000
Debt, weighted average interest rate			3.30%		3.30%	2.70%
2017 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, outstanding amount			$ 0		$ 0
Line of credit facility, remaining borrowing capacity			752,000,000		752,000,000
Letters of credit outstanding, amount			48,000,000		48,000,000
Term Loan A due 2020 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount			250,000,000		250,000,000
Debt instrument, outstanding amount			250,000,000		$ 250,000,000
Debt instrument, term					3 years
Debt instrument, maturity date					May 17, 2020
Term Loan A due 2022 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount			250,000,000		$ 250,000,000
Debt instrument, outstanding amount			250,000,000		$ 250,000,000
Debt instrument, term					5 years
Debt instrument, maturity date					May 17, 2022
Debt Instrument, amortization percentage per annum (payable in equal quarterly installments)					20.00%
Repayment of debt, accelerated amortization					$ 1,000,000
Repayment of outstanding principal balance			195,000,000		$ 195,000,000
Debt instrument, maturity year					2022
Carrying value of debt						$ 195,000,000
2017 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, term					5 years
Line of credit facility, maximum borrowing capacity			800,000,000		$ 800,000,000					$ 680,000,000
Line of credit facility, letter of credit sublimit			$ 125,000,000		125,000,000
Line of credit facility, unused capacity, commitment fee percentage							0.25%
Payments of debt issuance costs					1,000,000		$ 15,000,000
Debt issuance costs immediately recognized							$ 2,000,000
Repayments of debt						55,000,000
Carrying value of debt						25,000,000
2017 Revolving Credit Facility [Member] \| Accounts Receivable Securitization [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity						250,000,000
Repayment of debt, accelerated amortization					$ 6,000,000
2017 Revolving Credit Facility [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Line of credit facility, unused capacity, commitment fee percentage							0.175%
2017 Revolving Credit Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Line of credit facility, unused capacity, commitment fee percentage							0.40%
2017 Revolving Credit Facility [Member] \| Maximum [Member] \| Accounts Receivable Securitization [Member]
Debt Instrument [Line Items]
Repayment of debt, accelerated amortization						1,000,000
2017 Revolving Credit Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt instruments, percentage points added to variable rate			1.75%		1.75%
2017 Revolving Credit Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instruments, percentage points added to variable rate			1.75%		1.75%		1.375%
2017 Revolving Credit Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instruments, percentage points added to variable rate			2.00%		2.00%		2.50%
2017 Revolving Credit Facility [Member] \| Alternate base rate [Member]
Debt Instrument [Line Items]
Debt instruments, percentage points added to variable rate							0.75%
2017 Revolving Credit Facility [Member] \| Alternate base rate [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instruments, percentage points added to variable rate							0.375%
2017 Revolving Credit Facility [Member] \| Alternate base rate [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instruments, percentage points added to variable rate							1.50%
Term Loan B due 2024 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount			$ 600,000,000		$ 600,000,000
Debt instrument, maturity date					May 17, 2024
Debt Instrument, amortization percentage per annum (payable in equal quarterly installments)					1.00%
Repayment of debt, accelerated amortization					$ 5,000,000
Repayment of outstanding principal balance			$ 593,000,000		$ 593,000,000
Debt instrument, maturity year					2024
Carrying value of debt						593,000,000
Term Loan B due 2024 [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt instruments, percentage points added to variable rate			2.00%		2.00%
Term Loan B due 2024 [Member] \| Alternate base rate [Member]
Debt Instrument [Line Items]
Debt instruments, percentage points added to variable rate			1.00%		1.00%
2015 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Repayment of debt, accelerated amortization							$ 5,000,000
Medium-term Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			9.35%		9.35%
Debt instrument, maturity year					2019
Carrying value of debt			$ 5,000,000		$ 5,000,000
Senior Notes due 2018 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage							3.875%
Debt instrument, maturity year							2018
Carrying value of debt							$ 659,000,000
Notes due 2022 [Member]
Debt Instrument [Line Items]
Repayments of debt					$ 3,000,000		$ 39,000,000
Debt instrument, interest rate, stated percentage			4.75%		4.75%		4.75%
Debt instrument, maturity year					2022
Carrying value of debt			$ 1,080,000,000		$ 1,080,000,000	1,083,000,000
Notes due 2018 [Member]
Debt Instrument [Line Items]
Repayments of debt							$ 41,000,000
Debt instrument, interest rate, stated percentage			3.875%		3.875%		3.875%
Notes due 2018 and 2022 [Member]
Debt Instrument [Line Items]
Gain (loss) on repurchase of debt instrument							$ (3,000,000)
Notes due 2043 [Member]
Debt Instrument [Line Items]
Repayments of debt					$ 1,000,000
Debt instrument, interest rate, stated percentage			6.875%		6.875%
Debt instrument, maturity year					2043
Carrying value of debt			$ 374,000,000		$ 374,000,000	376,000,000
Other Debt [Member]
Debt Instrument [Line Items]
Debt instrument, outstanding amount			$ 81,000,000		$ 81,000,000	$ 83,000,000