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FINANCIAL INSTRUMENTS - Carrying amounts of financial instruments by category (Details)
$ in Millions, $ in Millions
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2016
CAD ($)
Disclosure of detailed information about financial instruments [line items]      
Financial assets at amortized cost   $ 2,907 $ 1,819
Fair value through profit or loss   855 917
Derivatives used for hedging   139 485
Financial liabilities at amortized cost   (26,299) (19,622)
Total   (22,398) (16,401)
Accounts payable      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities at amortized cost   (775) (595)
Financial liabilities   (775) (595)
Accrued liabilities      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities at amortized cost   (2,597) (2,222)
Financial liabilities   (2,597) (2,222)
Other long-term liabilities      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities, fair value through profit or loss   (38)  
Financial liabilities, derivatives used for hedging   (65)  
Financial liabilities at amortized cost   (469)  
Financial liabilities   (572)  
Long-term debt      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities at amortized cost   (22,458) (16,805)
Financial liabilities   (22,458) (16,805)
Accounts receivable      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at amortized cost   2,397 1,434
Financial assets   2,397 1,434
Investments      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at amortized cost   0 0
Financial assets, fair value through profit or loss   893 913
Financial assets   893 913
Other long-term assets      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at amortized cost   510 385
Financial assets, fair value through profit or loss   0 4
Financial assets, derivatives used for hedging   204 485
Financial assets   714 $ 874
AOSP      
Disclosure of detailed information about financial instruments [line items]      
Deferred purchase consideration payable $ 375 $ 469