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SUPPLEMENTAL CASH FLOW INFORMATION (Tables)
12 Months Ended
Dec. 31, 2020
Cash Flow Statement [Abstract]  
Changes in non-cash operating working capital items and capital expenditures
CHANGE IN NET OPERATING ASSETS AND LIABILITIES
  Years ended December 31
(In millions of dollars) 20202019
Accounts receivable, excluding financing receivables455 (174)
Financing receivables(1,658)(120)
Contract assets1,170 (204)
Inventories(19)
Other current assets(132)(41)
Accounts payable and accrued liabilities(326)61 
Contract and other liabilities 177 
Total change in net operating assets and liabilities (333)(462)

CAPITAL EXPENDITURES
  Years ended December 31
(In millions of dollars)20202019
Capital expenditures before proceeds on disposition2,312 2,845 
Proceeds on disposition (38)
Capital expenditures2,312 2,807