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SUPPLEMENTAL CASH FLOW INFORMATION
 12 Months Ended
Dec. 31, 2025
Cash Flow Statement [Abstract]  
SUPPLEMENTAL CASH FLOW INFORMATION SUPPLEMENTAL CASH FLOW INFORMATION
CHANGE IN NET OPERATING ASSETS AND LIABILITIES
  Years ended December 31
(In millions of dollars) 20252024
Accounts receivable, excluding financing receivables(540)(396)
Financing receivables(115)(318)
Contract assets16 7 
Inventories102 (185)
Other current assets(64)146 
Accounts payable and accrued liabilities(21)(209)
Contract and other liabilities 30 79 
Total change in net operating assets and liabilities (592)(876)

CAPITAL EXPENDITURES
  Years ended December 31
(In millions of dollars)Note20252024
Capital expenditures before proceeds on disposition3,863 4,100 
Proceeds on disposition8, 9(156)(59)
Capital expenditures3,707 4,041