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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Supplemental Cash Flow Information [Abstract]      
Current assets $ (47) $ 13 $ (35)
Other assets 43 29 37
Current liabilities (38) 59 (98)
Long-term liabilities and equity 87 43 (29)
Other items, net 45 144 (125)
Interest Paid, Including Capitalized Interest, Operating and Investing Activities [Abstract]      
Interest, net of amounts capitalized 239 263 280
Income Taxes Paid, Net [Abstract]      
Income taxes 202 97 120
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]      
Outstanding trade payables related to capital expenditures 18 27 34
(Gain) loss from equity investments $ (17) $ (14) $ (15)