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Accounts Receivable, Net (Tables)
 12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Accounts Receivable, Net
(in millions of Canadian dollars)
2018

2017

Freight
$
677

$
536

Non-freight
168

176

 
845

712

Allowance for doubtful accounts
(30
)
(25
)
Total accounts receivable, net
$
815

$
687