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NONCONSOLIDATED AFFILIATES (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]      
Investment in nonconsolidated affiliates   $ 3,007 $ 3,320
Equity Method Investment, Liability, Noncurrent   (139) 0
Equity Method Investment, Net of Investment Liabilities   2,868 3,320
EQUATE Petrochemical Company Ksc [Member]      
Schedule of Equity Method Investments [Line Items]      
Investment in nonconsolidated affiliates     $ 131
Equity Method Investment, Liability, Noncurrent   139  
Proceeds from Equity Method Investment, Distribution $ 440    
Sadara Chemical Company [Member]      
Schedule of Equity Method Investments [Line Items]      
Investment in nonconsolidated affiliates   $ 1,581  
Equity Method Investment, Ownership Percentage   35.00%