Transfer of Business Under Common Control

No definition available.

Name:	dow_TransferofBusinessUnderCommonControl
Namespace Prefix:	dow_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Face amount or stated value per share of common stock.

+ 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(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_CommonStockParOrStatedValuePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

+ Details

Name:	us-gaap_CommonStockSharesIssued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash inflow from parent as a source of financing that is recorded as additional paid in capital.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromContributionsFromParent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	dei_LegalEntityAxis=dow_DowInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=dow_DowDuPontMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=dow_TheDowChemicalCompanyDomain
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_RetainedEarningsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

SEPARATION FROM DOWDUPONT Separation from DowDuPont (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended
	Apr. 01, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Common stock, par value (in dollars per share)		$ 0.01		$ 0.01		$ 0.01
Common stock issued (in shares)		749,025,762		749,025,762		100
Settlements and transfers related to separation from DowDuPont Inc.				$ 1,963	$ (215)
Dow Inc. [Member]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01		$ 0.01		$ 0.01
Common stock issued (in shares)	748,771,240	749,025,762		749,025,762		100
Proceeds from Contributions from Parent	$ 2,024
DowDuPont [Member]
Common stock, par value (in dollars per share)	$ 0.01
The Dow Chemical Company [Domain]
Common stock, par value (in dollars per share)		$ 0.01		$ 0.01		$ 0.01
Common stock issued (in shares)		100		100		100
Settlements and transfers related to separation from DowDuPont Inc.				$ 61	215
Retained Earnings [Member]
Settlements and transfers related to separation from DowDuPont Inc.		$ 14,846	$ 37	14,811	152
Retained Earnings [Member] \| The Dow Chemical Company [Domain]
Settlements and transfers related to separation from DowDuPont Inc.		$ 16,025	$ 37	$ 15,990	$ 152