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SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION - Liabilities Arising From Financing Activities (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2017
CAD ($)
Disclosure of reconciliation of liabilities arising from financing activities [line items]  
Liabilities arising from financing activities, beginning balance $ 16,320
Changes in liabilities arising from financing activities [abstract]  
Issue of long-term debt 6,622
Settlement of hedge instruments, net 124
Non-cash changes (747)
Liabilities arising from financing activities, ending balance 22,319
Cash flow hedges on US dollar debt securities  
Disclosure of reconciliation of liabilities arising from financing activities [line items]  
Liabilities arising from financing activities, beginning balance (485)
Changes in liabilities arising from financing activities [abstract]  
Settlement of hedge instruments, net 124
Non-cash changes 222
Liabilities arising from financing activities, ending balance (139)
Long-term debt  
Disclosure of reconciliation of liabilities arising from financing activities [line items]  
Liabilities arising from financing activities, beginning balance 16,805
Changes in liabilities arising from financing activities [abstract]  
Issue of long-term debt 6,622
Non-cash changes (969)
Liabilities arising from financing activities, ending balance $ 22,458