XML 109 R80.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Summary Of Significant Accounting Policies - Goodwill and Other Intangible Assets (Details) - Customer Lists | 12 Months Ended
--- | ---
Dec. 31, 2017
Minimum |
Goodwill and Other Intangible Assets |
Estimated useful lives of other intangible assets and goodwill | 5 years
Maximum |
Goodwill and Other Intangible Assets |
Estimated useful lives of other intangible assets and goodwill | 10 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_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The useful lives used for other intangible assets and goodwill, 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_UsefulLivesOfOtherIntangibleAssetsAndGoodwill
Namespace Prefix: | su_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis=ifrs-full_CustomerrelatedIntangibleAssetsMember
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: |