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FINANCIAL INSTRUMENTS - Carrying amounts of financial instruments by category (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
CAD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CAD ($)
Disclosure of detailed information about financial instruments [line items]      
Deferred purchase consideration payable $ 118   $ 469
Financial assets at amortized cost 1,739   2,907
Fair value through profit or loss 519   855
Derivatives used for hedging 361   139
Financial liabilities at amortized cost (23,876)   (26,299)
Financial liabilities     (572)
Total $ (21,257)   (22,398)
Installment period 5 years    
Accounts payable      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities at amortized cost $ (779)   (775)
Financial liabilities (779)   (775)
Accrued liabilities      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities at amortized cost (2,356)   (2,597)
Financial liabilities (2,356)   (2,597)
Other long-term liabilities      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities, fair value through profit or loss (17)   (38)
Financial liabilities, derivatives used for hedging 0   (65)
Financial liabilities at amortized cost (118)   (469)
Financial liabilities (135)    
Long-term debt      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities at amortized cost (20,623)   (22,458)
Financial liabilities (20,623)   (22,458)
Accounts receivable      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at amortized cost 1,148   2,397
Financial assets 1,148   2,397
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 524   893
Financial assets 524   893
Other long-term assets      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at amortized cost 591   510
Financial assets, fair value through profit or loss 12   0
Financial assets, derivatives used for hedging 361   204
Financial assets 964   714
AOSP      
Disclosure of detailed information about financial instruments [line items]      
Deferred purchase consideration payable $ 118 $ 375 $ 469