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SUPPLEMENTAL CASH FLOW INFORMATION (Tables)
 12 Months Ended
Dec. 31, 2017
Cash Flow Statement [Abstract]  
Changes in non-cash operating working capital items
CHANGE IN NON-CASH OPERATING WORKING CAPITAL ITEMS
 
 
Years ended December 31
 
(In millions of dollars)
 
2017

2016

 
 
 
 
Accounts receivable
 
(161
)
(141
)
Inventories
 
2

3

Other current assets
 
17

(12
)
Accounts payable and accrued liabilities
 
9

182

Unearned revenue
 
(21
)
(18
)
 
 
 
 
Total change in non-cash operating working capital items
 
(154
)
14


CAPITAL EXPENDITURES
  
 
Years ended December 31
 
(In millions of dollars)
 
2017

2016

 
 
 
 
Capital expenditures before proceeds on disposition
 
2,510

2,352

Proceeds on disposition
 
(74
)
—

 
 
 
 
Capital expenditures
 
2,436

2,352