Dow Consolidated Balance Sheets Parentheticals - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Cash and cash equivalents (variable interest entities restricted - 2021: $49; 2020: $26)	$ 2,911	$ 5,104
Accounts Receivable, Allowance for Credit Loss, Current	59	51
Investments, Fair Value Disclosure	1,958	1,674
Net property (variable interest entities restricted - 2021: $187; 2020: $232)	19,648	20,239
Finite-Lived Intangible Assets, Accumulated Amortization	4,747	4,428
Long-Term Debt (variable interest entities nonrecourse - 2021: $4; 2020: $6)	$ 14,027	$ 16,491
Common Stock, Shares Authorized	5,000,000,000	5,000,000,000
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares, Issued	761,777,581	755,993,198
Treasury Stock, Shares	22,163,169	12,803,303
Variable Interest Entity, Primary Beneficiary [Member]
Cash and cash equivalents (variable interest entities restricted - 2021: $49; 2020: $26)	$ 49	$ 26
Net property (variable interest entities restricted - 2021: $187; 2020: $232)	187	232
Long-Term Debt (variable interest entities nonrecourse - 2021: $4; 2020: $6)	$ 4	$ 6