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ACCOUNTS RECEIVABLE (Tables)
 12 Months Ended
Dec. 31, 2018
Subclassifications of assets, liabilities and equities [abstract]  
Schedule of Receivables
 
 
As at December 31
 
(In millions of dollars)
 

2018

2017

 
Note

 
(restated,
see note 2)

 
 
 
 
Customer accounts receivable
 
1,529

1,443

Other accounts receivable
 
785

653

Allowance for doubtful accounts
16

(55
)
(61
)
 
 
 
 
Total accounts receivable
 

2,259

2,035