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COMMITMENTS AND CONTINGENT LIABILITIES (Guarantees) (Table and Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Guarantor Obligations [Line Items]    
Document Period End Date Sep. 30, 2019  
Long-term Debt $ 17,591 $ 19,591
Sadara Chemical Company [Member]    
Guarantor Obligations [Line Items]    
Equity Method Investment, Ownership Percentage 35.00%  
Sadara Chemical Company [Member] | Total Project Financing [Member]    
Guarantor Obligations [Line Items]    
Project Financing, Maximum Borrowing Capacity $ 12,500  
Long-term Debt 11,200 11,700
Performance Guarantee [Member]    
Guarantor Obligations [Line Items]    
Guarantor obligations, maximum future payments 4,116 4,273
Guarantor obligations, recorded liability 11 $ 22
Performance Guarantee [Member] | Sadara Chemical Company [Member]    
Guarantor Obligations [Line Items]    
Guarantor obligations, maximum future payments $ 4,100