| Cover Page | Aug. 17, 2020 |
| Document And Entity Information [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Aug. 17, 2020 |
| Entity File Number | 001-38646 |
| Entity Registrant Name | Dow Inc. |
| Entity Central Index Key | 0001751788 |
| Entity Tax Identification Number | 30-1128146 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 2211 H.H. Dow Way |
| Entity Address, City or Town | Midland |
| Entity Address, State or Province | MI |
| Entity Address, Postal Zip Code | 48674 |
| City Area Code | 989 |
| Local Phone Number | 636-1000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.01 per share |
| Trading Symbol | DOW |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Dow Chemical Co [Member] | |
| Document And Entity Information [Line Items] | |
| Entity File Number | 001-03433 |
| Entity Registrant Name | The Dow Chemical Company |
| Entity Central Index Key | 0000029915 |
| Entity Tax Identification Number | 38-1285128 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 2211 H.H. Dow Way |
| Entity Address, City or Town | Midland |
| Entity Address, State or Province | MI |
| Entity Address, Postal Zip Code | 48674 |
| City Area Code | 989 |
| Local Phone Number | 636-1000 |
| 0.500% Notes due March 15, 2027 [Member] | |
| Document And Entity Information [Line Items] | |
| Title of 12(b) Security | 0.500% Notes due March 15, 2027 |
| Trading Symbol | DOW/27 |
| Security Exchange Name | NYSE |
| 1.125% Notes due March 15, 2032 [Member] | |
| Document And Entity Information [Line Items] | |
| Title of 12(b) Security | 1.125% Notes due March 15, 2032 |
| Trading Symbol | DOW/32 |
| Security Exchange Name | NYSE |
| 1.875% Notes due March 15, 2040 [Member] | |
| Document And Entity Information [Line Items] | |
| Title of 12(b) Security | 1.875% Notes due March 15, 2040 |
| Trading Symbol | DOW/40 |
| Security Exchange Name | NYSE |
| 4.625% Notes due October 1, 2044 [Member] | |
| Document And Entity Information [Line Items] | |
| Title of 12(b) Security | 4.625% Notes due October 1, 2044 |
| Trading Symbol | DOW/44 |
| Security Exchange Name | NYSE |
