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OTHER LONG-TERM LIABILITIES - Share-Based Compensation (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation Of Changes In Liabilities From Share-Based Payment Transactions [Roll Forward]
Balance – beginning of year	$ 426	$ 128	$ 203
Share-based compensation expense (recovery)	134	355	(46)
Cash payment for stock options surrendered	(6)	(7)	(1)
Transferred to common shares	(154)	(117)	(18)
Charged to (recovered from) Oil Sands Mining and Upgrading, net	14	67	(10)
Balance – end of year	414	426	128
Less: current portion	348	368	105
Non-current liabilities from share-based payment arrangements	66	58	23
Performance Share Units
Reconciliation Of Changes In Liabilities From Share-Based Payment Transactions [Roll Forward]
Share-based compensation expense (recovery)	$ 5	$ 0	$ 0

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Current Liabilities From Share-Based Payment Arrangements

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Liabilities From Share-Based Payment Transactions, Charged to (Recovered From) Segment

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Liabilities From Share-Based Payment Transactions, Transferred To Common Shares Through Exercise Of Options

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Non-Current Liabilities From Share-Based Payment Transactions

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Reconciliation Of Changes In Liabilities From Share-Based Payment Transactions [Roll Forward]

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- Definition

The amount of expense from share-based payment transactions with employees.

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- Definition

The amount of liabilities arising from share-based payment transactions. Share-based payment transactions are transactions in which the entity: (a) receives goods or services from the supplier of those goods or services (including an employee) in a share-based payment arrangement; or (b) incurs an obligation to settle the transaction with the supplier in a share-based payment arrangement when another group entity receives those goods or services. [Refer: Share-based payment arrangements [member]]

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The cash outflow for payments for equity instruments that the entity does not separately disclose in the same statement or note.

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