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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Schedule of Supplemental Cash Flow [Line Items]        
Insured Event, Gain (Loss) $ 0 $ 0 $ 0 $ 65
Other current assets     23 (93)
Other noncurrent assets     13 25
Payables and other current liabilities     79 28
Long-term liabilities and equity     (25) (35)
Total     $ 90 $ (75)