Name:	oln_A2020SeniorSecuredCreditFacility
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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Payments received from customers on sold accounts receivable.

No definition available.

Name:	oln_Paymentsreceivedfromcustomersonsoldaccounts
Namespace Prefix:	oln_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents the amount of available borrowing capacity under the Receivables Financing Agreement as of the date of the statement of financial position.

No definition available.

Name:	oln_ReceivablesFinancingAvailableBorrowingCapacity
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Maximum capacity under secured borrowing facility to be recognized in the transferor's statement of financial position at the end of each period presented.

No definition available.

Name:	oln_SecuredBorrowingMaximumCapacity
Namespace Prefix:	oln_
Data Type:	xbrli:monetaryItemType
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The minimum borrowing required percentage which is applied to either the available borrowing capacity or facility limit, whichever is greater, to determine the minimum amount that must be borrowed and outstanding.

No definition available.

Name:	oln_SecuredBorrowingMinimumBorrowingPercentage
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Maximum amount of potential receivables which can be sold under the facility.

No definition available.

Name:	oln_TransferofFinancialAssetsFacilityMaximum
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Data Type:	xbrli:monetaryItemType
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_AccountsNotesAndLoansReceivableLineItems
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Data Type:	xbrli:stringItemType
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Amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction that have been derecognized. Continuing involvement includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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Amount of gain (loss) on sale of accounts receivable.

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Name:	us-gaap_GainLossOnSaleOfAccountsReceivable
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Reflects the aggregate value of loans, trade receivables, securities and financial instruments that serve as collateral for obligations arising from a transfer of financial assets recorded as a secured borrowing.

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Data Type:	xbrli:monetaryItemType
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The cash inflow associated with the proceeds from sale and collection of receivables during the period.

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-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585

Name:	us-gaap_ProceedsFromSaleAndCollectionOfReceivables
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Data Type:	xbrli:monetaryItemType
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Amortized amount of contract to service financial assets under which estimated future revenues from contractually specified servicing fees, late charges, and other ancillary revenue are not expected to adequately compensate the servicer for performing the servicing.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Name:	us-gaap_ServicingLiabilityAtAmortizedValueBalance
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Data Type:	xbrli:monetaryItemType
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Carrying amount of liabilities associated with financial assets accounted for as secured borrowings recognized in the transferor's statement of financial position at the end of each period presented.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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