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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Supplemental Cash Flow Information [Abstract]      
Current assets $ 13 $ (35) $ 5
Other assets 29 37 75
Current liabilities 59 (98) 22
Long-term liabilities 43 (29) (72)
Other items, net 144 (125) 30
Interest Paid [Abstract]      
Interest, net of amounts capitalized 263 280 265
Income Taxes Paid, Net [Abstract]      
Income taxes 97 120 124
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]      
Outstanding trade payables related to capital expenditures 27 34 10
(Gain) loss from equity investments $ (14) $ (15) $ (15)