NONCONSOLIDATED AFFILIATES (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Investment in nonconsolidated affiliates	$ 1,620		$ 1,327
Equity Method Investment, Liability, Noncurrent	153		169
Equity Method Investment, Net of Investment Liabilities	1,467		1,158
The Kuwait Styrene Company K.S.C.C. [Member]
Schedule of Equity Method Investments [Line Items]
Proceeds from Equity Method Investment, Distribution	25	$ 42
EQUATE Petrochemical Company Ksc [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Liability, Noncurrent	153		147
Proceeds from Equity Method Investment, Distribution	79
The Kuwait Olefins Company K.S.C.C. [Member]
Schedule of Equity Method Investments [Line Items]
Proceeds from Equity Method Investment, Distribution	74
Sadara Chemical Company [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Liability, Noncurrent	$ 306		$ 22