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Subsequent Event (Details) - Risk Mitigation Proceeds $ in Millions	Jan. 01, 2019 CAD ($)
Disclosure of non-adjusting events after reporting period [line items]
Risk mitigation proceeds	$ 300
Risk mitigation, net of tax	$ 260

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The cash inflow from risk mitigation.

+ References

No definition available.

+ Details

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Namespace Prefix:	su_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The cash inflow from risk mitigation, net of tax

+ References

No definition available.

+ Details

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Namespace Prefix:	su_
Data Type:	xbrli:monetaryItemType
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- Details

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