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Provisions - Summary of Changes to Decommissioning Liability (Detail) - CAD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Disclosure of Provisions [line items]
Balance, beginning of year	$ 100	$ 129
Net liabilities added (disposed)	0	(6)
Increase (decrease) due to changes in estimates	(42)	(10)
Liabilities settled	(9)	(14)
Transfers from (to) liabilities for assets held for sale	7	7
Accretion charges	4	8
Balance, end of year	60	100
Current portion	8	13
Long-term portion	$ 52	$ 87

X

- Definition

The decrease in other provisions resulting from the transfer of those provisions to liabilities included in disposal groups classified as held for sale. [Refer: Other provisions; Disposal groups classified as held for sale [member]]

+ References

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- Definition

The amount of non-current provision for decommissioning, restoration and rehabilitation costs. [Refer: Provision for decommissioning, restoration and rehabilitation costs]

+ References

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- Definition

The amount of provision for costs related to decommissioning, restoration and rehabilitation. [Refer: Other provisions]

+ References

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- Definition

The amount of current provision for decommissioning, restoration and rehabilitation costs. [Refer: Provision for decommissioning, restoration and rehabilitation costs]

+ References

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Disclosure of provisions line items.

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- Definition

Increase (decrease) in decommissioning liability due to changes in estimates.

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Increase decrease through disposition of assets, provisions.

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Increase due to accretion, provisions.

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- Definition

Provisions settled or assets decommissioned.

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