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Accounts Receivable, Net (Details) - CAD
CAD in Millions
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-freight accounts receivable CAD 185 CAD 189
Accounts receivable, Gross 676 724
Allowance for doubtful accounts (31) (22)
Total accounts receivable, net 645 702
Freight [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, Gross CAD 491 CAD 535