XML 102 R73.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Summary Of Significant Accounting Policies (Details) | 12 Months Ended
--- | ---
Dec. 31, 2018
Oil sands upgraders, extraction plants and mine facilities | Minimum |
Disclosure of detailed information about property, plant and equipment [line items] |
Property, Plant and Equipment, Useful Life | 20 years
Oil sands upgraders, extraction plants and mine facilities | Maximum |
Disclosure of detailed information about property, plant and equipment [line items] |
Property, Plant and Equipment, Useful Life | 40 years
Oil sands mine equipment | Minimum |
Disclosure of detailed information about property, plant and equipment [line items] |
Property, Plant and Equipment, Useful Life | 5 years
Oil sands mine equipment | Maximum |
Disclosure of detailed information about property, plant and equipment [line items] |
Property, Plant and Equipment, Useful Life | 15 years
Oil sands in situ processing facilities | Maximum |
Disclosure of detailed information about property, plant and equipment [line items] |
Property, Plant and Equipment, Useful Life | 30 years
Power generation and utility plants | Minimum |
Disclosure of detailed information about property, plant and equipment [line items] |
Property, Plant and Equipment, Useful Life | 30 years
Power generation and utility plants | Maximum |
Disclosure of detailed information about property, plant and equipment [line items] |
Property, Plant and Equipment, Useful Life | 40 years
Refineries and other processing plants | Minimum |
Disclosure of detailed information about property, plant and equipment [line items] |
Property, Plant and Equipment, Useful Life | 20 years
Refineries and other processing plants | Maximum |
Disclosure of detailed information about property, plant and equipment [line items] |
Property, Plant and Equipment, Useful Life | 40 years
Marketing and other distribution assets | Minimum |
Disclosure of detailed information about property, plant and equipment [line items] |
Property, Plant and Equipment, Useful Life | 10 years
Marketing and other distribution assets | Maximum |
Disclosure of detailed information about property, plant and equipment [line items] |
Property, Plant and Equipment, Useful Life | 40 years
Inspection, overhaul and turnaround activities | Minimum |
Disclosure of detailed information about property, plant and equipment [line items] |
Property, Plant and Equipment, Useful Life | 2 years
Inspection, overhaul and turnaround activities | Maximum |
Disclosure of detailed information about property, plant and equipment [line items] |
Property, Plant and Equipment, Useful Life | 5 years

X
- 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. + Details
Name: | ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The useful lives used for property, plant and equipment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | su_UsefulLivesPropertyPlantAndEquipment
Namespace Prefix: | su_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=su_OilSandsUpgradersExtractionPlantsAndMineFacilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=su_OilSandsMineEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=su_OilSandsInSituProcessingFacilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=su_PowerGenerationAndUtilityPlantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=su_RefineriesAndOtherProcessingPlantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=su_MarketingAndOtherDistributionAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=su_InspectionOverhaulAndTurnaroundActivitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |