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Accounts Receivable, Net (Tables)
12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Accounts Receivable, Net
(in millions of Canadian dollars)
2017

2016

Freight
$
536

$
461

Non-freight
176

162


712

623

Allowance for doubtful accounts
(25
)
(32
)
Total accounts receivable, net
$
687

$
591