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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Schedule of Supplemental Cash Flow [Line Items]        
Insured Event, Gain (Loss) $ 0 $ 0 $ 65 $ 0
Other current assets     (93) [1] 25
Other noncurrent assets     25 7
Payables and other current liabilities     28 2
Long-term liabilities and equity     (35) (13)
Total     (75) $ 21
Other Current Assets [Member]        
Schedule of Supplemental Cash Flow [Line Items]        
Insured Event, Gain (Loss)     $ 65  
[1] First nine months 2018 includes a $65 million insurance receivable from final settlement of the coal gasification incident.