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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

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