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Accounts Receivable, Net (Tables)
12 Months Ended
Dec. 31, 2015
Receivables [Abstract]  
Accounts Receivable, Net
(in millions of Canadian dollars)
2015

2014

Freight
$
491

$
535

Non-freight
185

189

 
676

724

Allowance for doubtful accounts
(31
)
(22
)
Total accounts receivable, net
$
645

$
702