NOTES PAYABLE, LONG-TERM DEBT AND AVAILABLE CREDIT FACILITIES Notes Payable (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Short-term Debt [Line Items]
Short-term Debt	$ 544	$ 298
Period-end average interest rates	5.67%	8.28%
Commercial Paper [Member]
Short-term Debt [Line Items]
Short-term Debt	$ 0	$ 10
Notes Payable to Banks [Member]
Short-term Debt [Line Items]
Short-term Debt	468	288
Notes Payable to Related Party [Member]
Short-term Debt [Line Items]
Short-term Debt	76	$ 0
Notes Payable to Related Party [Member] | The Dow Chemical Company [Domain] | Dow Inc. [Member]
Short-term Debt [Line Items]
Short-term Debt	$ 1,147