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Other Long-Term Liabilities - Share-Based Compensation (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation Of Changes In Liabilities From Share-Based Payment Transactions [Roll Forward]
Balance – beginning of year	$ 124	$ 414	$ 426
Share-based compensation expense (recovery)	223	(146)	134
Cash payment for stock options surrendered	(2)	(5)	(6)
Transferred to common shares	(53)	(120)	(154)
Charged to (recovered from) Oil Sands Mining and Upgrading, net	5	(19)	14
Balance – end of year	297	124	414
Less: current portion	227	92	348
Non-current liabilities from share-based payment arrangements	70	32	66
Performance Share Units
Reconciliation Of Changes In Liabilities From Share-Based Payment Transactions [Roll Forward]
Share-based compensation expense (recovery)	$ 62	$ 13	$ 5

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- Definition

Current Liabilities From Share-Based Payment Arrangements

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- Definition

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

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- Definition

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.

+ References

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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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