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ACCOUNTS RECEIVABLE (Tables)
 12 Months Ended
Dec. 31, 2019
Subclassifications of assets, liabilities and equities [abstract]  
Schedule of Receivables
 
 
As at December 31
 
(In millions of dollars)
Note

2019

2018

 
 
 
 
Customer accounts receivable
 
1,579

1,529

Other accounts receivable
 
785

762

Allowance for doubtful accounts
15

(60
)
(55
)
 
 
 
 
Total accounts receivable
 

2,304

2,236