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

The change in deferred income tax valuation allowance due to the amount credited to the income tax provision (i.e. deduction from reserve) during the period.

No definition available.

Name:	oln_Amountscreditedtoincometaxprovision
Namespace Prefix:	oln_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The change in deferred income tax valuation allowance due purchase accounting.

No definition available.

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

The impact on the valuation allowance as a result of the application of the U.S. Tax Cuts and Jobs Act.

No definition available.

Name:	oln_U.S.TaxCutsandJobsActValuationAllowanceImpact
Namespace Prefix:	oln_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The currency translation adjustment impact on the valuation allowance.

No definition available.

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

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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

- References

No definition available.