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FINANCIAL INSTRUMENTS - Carrying amounts and fair values of financial instruments (Details) - CAD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Other long-term liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, carrying amount $ (103)  
Other long-term liabilities | Level 1    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, at fair value 0  
Other long-term liabilities | Level 2    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, at fair value 103  
Other long-term liabilities | Level 3    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, at fair value 0  
Fixed rate long-term debt    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, carrying amount (22,458) $ (16,805)
Fixed rate long-term debt | Fixed interest rate    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, carrying amount (15,989) (12,498)
Fixed rate long-term debt | Fixed interest rate | Level 1    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, at fair value (17,259) (13,217)
Fixed rate long-term debt | Fixed interest rate | Level 2    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, at fair value 0 0
Fixed rate long-term debt | Fixed interest rate | Level 3    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, at fair value 0 0
Investments    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount 893 913
Investments | Level 1    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 893 913
Investments | Level 2    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 0 0
Investments | Level 3    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 0 0
Other long-term assets    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount 714 874
Other long-term assets | Level 1    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 0 0
Other long-term assets | Level 2    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 204 489
Other long-term assets | Level 3    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value $ 510 $ 385