XML 136 R107.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Provisions - Decommissioning and Restoration (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 CAD ($) | Dec. 31, 2017 CAD ($)
Provision for decommissioning, restoration and rehabilitation costs [abstract] |  |
Percentage change in discount rate used to arrive at provision for decommissioning, restoration and rehabilitation costs | 1.0 | 1.0
1% Increase | $ (1,099) | $ (1,218)
1% Decrease | $ 1,521 | $ 1,758

X
- References No definition available. + Details
Name: | ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCostsAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage change in discount rate used to arrive at the provision for decommissioning restoration and rehabilitation costs. + References No definition available. + Details
Name: | su_PercentageChangeInDiscountRateUsedToArriveAtProvisionForDecommissioningRestorationAndRehabilitationCosts
Namespace Prefix: | su_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of provision for costs related to decommissioning, restoration and rehabilitation following a 1 % decrease in the discount rate. + References No definition available. + Details
Name: | su_ProvisionForDecommissioningRestorationAndRehabilitationCostsFollowing1PercentDecreaseInDiscountRate
Namespace Prefix: | su_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of provision for costs related to decommissioning, restoration and rehabilitation following a 1 % increase in the discount rate. + References No definition available. + Details
Name: | su_ProvisionForDecommissioningRestorationAndRehabilitationCostsFollowing1PercentIncreaseInDiscountRate
Namespace Prefix: | su_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant