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Receivables, Net (Details) - CAD
CAD in Millions
Dec. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Customer accounts receivable CAD 985 CAD 550
Allowance for Doubtful Accounts (13) (12)
Customer accounts receivable, net 972 538
Other 42 40
Receivables, Net 1,014 578
Billed [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Customer accounts receivable 715 406
Unbilled [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Customer accounts receivable CAD 270 CAD 144