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OTHER LONG-TERM LIABILITIES - Share-Based Compensation (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation Of Changes In Liabilities From Share-Based Payment Transactions [Roll Forward]
Balance – beginning of year	$ 414	$ 426	$ 128
Share-based compensation (recovery) expense	(146)	134	355
Cash payment for stock options surrendered	(5)	(6)	(7)
Transferred to common shares	(120)	(154)	(117)
(Recovered from) charged to Oil Sands Mining and Upgrading, net	(19)	14	67
Balance – end of year	124	414	426
Less: current portion	92	348	368
Non-current liabilities from share-based payment arrangements	32	66	58
Performance Share Units
Reconciliation Of Changes In Liabilities From Share-Based Payment Transactions [Roll Forward]
Share-based compensation (recovery) expense	$ 13	$ 5	$ 0

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- Definition

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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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