XML 97 R120.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

FINANCIAL INSTRUMENTS AND RISK MANAGEMENT - Non Derivative Financial Instruments (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 CAD ($) | Dec. 31, 2018 CAD ($)
Non Derivative Financial Instruments |  |
Partnership liability | $ 455 | $ 477
East Tank Farm Development | Fort McKay First Nation and the Mikisew Cree First Nation Partnership |  |
Non Derivative Financial Instruments |  |
Percentage of ownership interest acquired | 49 |
Fixed Term Notes |  |
Non Derivative Financial Instruments |  |
Borrowings excluding short term debt | $ 12,927 | 12,900
Fair value of fixed term debt | $ 16,100 | $ 14,200

X
- Definition The fair value of fixed term debt. + References No definition available. + Details
Name: | su_FixedTermDebtAtFairValue
Namespace Prefix: | su_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of liabilities arising from partnership transactions. + References No definition available. + Details
Name: | su_LiabilityFromPartnership
Namespace Prefix: | su_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of long term debt before accrued charges and issuance costs. + References No definition available. + Details
Name: | su_LongtermBorrowingsGross
Namespace Prefix: | su_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition The percentage of ownership interest acquired by counterparties in subsidiary. + References No definition available. + Details
Name: | su_ProportionOfOwnershipInterestAcquiredByCounterparties
Namespace Prefix: | su_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=su_EastTankFarmDevelopmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=su_FortMckayFirstNationAndMikisewCreeFirstNationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=su_FixedTermDebtRedeemableAtOptionOfCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |