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SUPPLEMENTAL CASH FLOW INFORMATION (Tables)
 12 Months Ended
Dec. 31, 2017
Supplemental Cash Flow Information [Abstract]  
Schedule of Cash Flow Supplemental Disclosures Other Items
Included in the line item "Other items, net" of the "Operating activities" section of the Consolidated Statements of Cash Flows are specific changes to certain balance sheet accounts as follows:
 
For years ended December 31,
(Dollars in millions)
2017
 
2016
 
2015
Current assets
$
13

 
$
(35
)
 
$
5

Other assets
29

 
37

 
75

Current liabilities
59

 
(98
)
 
22

Long-term liabilities
43

 
(29
)
 
(72
)
Total
$
144

 
$
(125
)
 
$
30
Schedule of Cash Paid for Interest and Income Taxes and Noncash Investing and Financing Activities
 
For years ended December 31,
(Dollars in millions)
2017
 
2016
 
2015
 
 
 
 
 
 
Interest, net of amounts capitalized
$
263

 
$
280

 
$
265

Income taxes
97

 
120

 
124

Non-cash investing and financing activities:
 
 
 
 
 
Outstanding trade payables related to capital expenditures
27

 
34

 
10

(Gain) loss from equity investments
(14
)
 
(15
)
 
(15
)