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Accounts Receivable, Net (Tables)
 12 Months Ended
Dec. 31, 2016
Receivables [Abstract]  
Accounts Receivable, Net
(in millions of Canadian dollars)
2016

2015

Freight
$
461

$
491

Non-freight
162

185


623

676

Allowance for doubtful accounts
(32
)
(31
)
Total accounts receivable, net
$
591

$
645