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Accounts Receivable, Net (Tables)
 12 Months Ended
Dec. 31, 2019
Receivables [Abstract]  
Accounts Receivable, Net
(in millions of Canadian dollars)
2019

2018

Freight
$
637

$
677

Non-freight
210

168

 
847

845

Allowance for doubtful accounts
(42
)
(30
)
Total accounts receivable, net
$
805

$
815