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FINANCIAL INSTRUMENTS - Maturity dates for financial liabilities (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
CAD ($)
Dec. 31, 2016
CAD ($)
Dec. 31, 2015
CAD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CAD ($)
Disclosure of detailed information about financial instruments [line items]          
Accounts payable   $ 595     $ 775
Accrued liabilities   2,222     2,597
Other long-term liabilities   3,223     4,397
Long-term debt   16,805     22,458
Interest and other financing expense $ 728 431 $ 375    
AOSP          
Disclosure of detailed information about financial instruments [line items]          
Deferred purchase consideration payable       $ 375 469
Gross carrying amount          
Disclosure of detailed information about financial instruments [line items]          
Long-term debt   $ 16,870     22,597
Less than 1 year | Gross carrying amount          
Disclosure of detailed information about financial instruments [line items]          
Long-term debt         2,027
1 to less than 2 years | Gross carrying amount          
Disclosure of detailed information about financial instruments [line items]          
Long-term debt         4,228
Thereafter | Gross carrying amount          
Disclosure of detailed information about financial instruments [line items]          
Long-term debt         10,351
Liquidity risk | Less than 1 year          
Disclosure of detailed information about financial instruments [line items]          
Accounts payable         775
Accrued liabilities         2,597
Other long-term liabilities         572
Interest and other financing expense 842        
Liquidity risk | Less than 1 year | Gross carrying amount          
Disclosure of detailed information about financial instruments [line items]          
Long-term debt         2,027
Liquidity risk | 1 to less than 2 years          
Disclosure of detailed information about financial instruments [line items]          
Accounts payable         0
Accrued liabilities         0
Other long-term liabilities         0
Interest and other financing expense 755        
Liquidity risk | 1 to less than 2 years | Gross carrying amount          
Disclosure of detailed information about financial instruments [line items]          
Long-term debt         4,228
Liquidity risk | 2 to less than 5 years          
Disclosure of detailed information about financial instruments [line items]          
Accounts payable         0
Accrued liabilities         0
Other long-term liabilities         0
Interest and other financing expense 1,712        
Liquidity risk | 2 to less than 5 years | Gross carrying amount          
Disclosure of detailed information about financial instruments [line items]          
Long-term debt         5,991
Liquidity risk | Thereafter          
Disclosure of detailed information about financial instruments [line items]          
Accounts payable         0
Accrued liabilities         0
Other long-term liabilities         0
Interest and other financing expense $ 5,384        
Liquidity risk | Thereafter | Gross carrying amount          
Disclosure of detailed information about financial instruments [line items]          
Long-term debt         $ 10,351