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Other Long-Term Liabilities - Share-Based Compensation (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation Of Changes In Liabilities From Share-Based Payment Transactions [Roll Forward]
Balance – beginning of year	$ 297	$ 124	$ 414
Share-based compensation (recovery) expense	(82)	223	(146)
Cash payment for stock options surrendered and PSUs vested	(39)	(2)	(5)
Transferred to common shares	(21)	(53)	(120)
Charged to (recovered from) Oil Sands Mining and Upgrading, net	5	5	(19)
Balance – end of year	160	297	124
Less: current portion	119	227	92
Non-current liabilities from share-based payment arrangements	41	70	32
Performance Share Units
Reconciliation Of Changes In Liabilities From Share-Based Payment Transactions [Roll Forward]
Share-based compensation (recovery) expense	$ 49	$ 62	$ 13

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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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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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