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Financial Instruments and Risk Management - Non Derivative Financial Instruments (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2022 CAD ($) | Dec. 31, 2021 CAD ($)
Non Derivative Financial Instruments |  |  |
Carrying value of partnership liability |  | $ 427 | $ 436
Fixed term debt |  |  |
Non Derivative Financial Instruments |  |  |
Long-term debt |  | 9,840 | 14,278
Fair value of long-term debt |  | $ 9,400 | $ 17,400
Fort McKay First Nation and the Mikisew Cree First Nation Partnership | East Tank Farm Development |  |  |
Non Derivative Financial Instruments |  |  |
Percentage of partnership ownership interest acquired | 49 |  |

X
- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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Namespace Prefix: | su_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of liabilities arising from partnership transactions at amortized cost, including accrued interest expense. + References No definition available. + Details
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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
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Namespace Prefix: | su_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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