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SUPPLEMENTAL CASH FLOW INFORMATION (Tables)
12 Months Ended
Dec. 31, 2020
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)202020192018
Current assets$(1)$(5)$(47)
Other assets(14)15 43 
Current liabilities(82)(38)
Long-term liabilities and equity15 (17)87 
Total$$(89)$45 
Schedule of Cash Paid for Interest and Income Taxes and Noncash Investing and Financing Activities
 For years ended December 31,
(Dollars in millions)202020192018
Interest, net of amounts capitalized$191 $235 $239 
Income taxes 179 217 202 
Non-cash investing activities:
Outstanding trade payables related to capital expenditures20 22 18