XML 123 R97.htm IDEA: XBRL DOCUMENT
v3.20.4

DEBT AND CREDIT FACILITIES (Details) $ / shares in Units, $ in Millions, $ in Millions | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2020 CAD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 CAD ($) | Feb. 05, 2016 | Feb. 04, 2016
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Commercial papers issued |  |  |  | $ 3,566.0 |  |  | $ 2,155.0 |  |
Interest rate on notes | 4.80% | 5.30% | 5.30% | 4.80% |  |  | 5.30% |  |
Lease liability |  |  |  | $ 2,908.0 |  |  | $ 2,931.0 |  |
Deferred financing costs |  |  |  | (54.0) |  |  | (43.0) |  |
Longterm borrowings net of deferred financing costs |  |  |  | 18,133.0 |  |  | 15,815.0 |  |
Current portion of longterm debt and lease liabilities |  |  |  |  |  |  |  |  |
Current portion of lease liabilities |  |  |  | (272.0) |  |  | (310.0) |  |
Long - term debt |  |  |  | (1,413.0) |  |  |  |  |
Current portion of long-term debt |  |  |  | (1,685.0) |  |  | (310.0) |  |
Long-term lease liabilities |  |  |  | 2,636.0 |  |  | 2,621.0 |  |
Long-term debt |  |  |  | $ 13,812.0 |  |  | 12,884.0 |  |
Minimum |  |  |  |  |  |  |  |  |
Additional information |  |  |  |  |  |  |  |  |
Interest rate on lease liabilities | 1.10% |  |  | 1.10% |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |
Additional information |  |  |  |  |  |  |  |  |
Interest rate on lease liabilities | 14.20% |  |  | 14.20% |  |  |  |  |
Commercial paper |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Commercial papers issued |  |  |  | $ 3,566.0 |  |  | $ 2,155.0 |  |
Commercial paper | Maximum |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Commercial paper authorized to be issued |  |  |  | $ 5,000.0 |  |  |  |  |
Commercial paper term | 365 days |  |  |  |  |  |  |  |
Commercial paper | Weighted average |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Interest rate on notes | 0.39% | 2.05% | 2.05% | 0.39% |  |  | 2.05% |  |
Fixed Term Notes |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Total unsecured long term debt |  |  |  | $ 15,279.0 |  |  | $ 12,927.0 |  |
Notes 7.75 Percent Due 2019 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Interest rate on notes |  | 7.75% | 7.75% |  |  |  | 7.75% |  |
Additional information |  |  |  |  |  |  |  |  |
Long-term debt repaid |  | $ 140.0 |  |  |  |  |  |  |
Book value |  |  |  |  |  |  | $ 188.0 |  |
Original borrowings maturity amount |  | 145.0 | $ 145.0 |  |  |  | 195.0 |  |
Accrued interest |  | $ 5.0 | $ 5.0 |  |  |  | $ 7.0 |  |
3.10% Series 5 Medium Term Notes, due 2021 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Interest rate on notes | 3.10% | 3.10% | 3.10% | 3.10% |  |  | 3.10% |  |
Total unsecured long term debt |  |  |  | $ 748.0 |  |  | $ 749.0 |  |
Debentures 9.25 Percent Due 2021 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Interest rate on notes | 9.25% | 9.25% | 9.25% | 9.25% |  |  | 9.25% |  |
Total unsecured long term debt | $ 300.0 | $ 300.0 | $ 300.0 | $ 389.0 |  |  | $ 403.0 |  |
Notes 9.40 Percent Due 2021 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Interest rate on notes | 9.40% | 9.40% | 9.40% | 9.40% |  |  | 9.40% |  |
Total unsecured long term debt | $ 220.0 |  |  | $ 281.0 |  |  | $ 292.0 |  |
Additional information |  |  |  |  |  |  |  |  |
Revised debt coupon rate following ratings downgrade by Moodys |  |  |  |  |  |  |  | 9.40% | 7.90%
Notes 4.50 Percent Due 2022 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Interest rate on notes | 4.50% | 4.50% | 4.50% | 4.50% |  |  | 4.50% |  |
Total unsecured long term debt | $ 182.0 |  |  | $ 224.0 |  |  | $ 225.0 |  |
Notes 2.80% Due 2023 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Face amount of debt | $ 450.0 |  |  |  |  |  |  |  |
Interest rate on notes | 2.80% | 2.80% | 2.80% | 2.80% |  |  | 2.80% |  |
Total unsecured long term debt | $ 450.0 |  |  | $ 574.0 |  |  |  |  |
Additional information |  |  |  |  |  |  |  |  |
Debt instrument issue price | $ / shares | $ 99.903 |  |  |  |  |  |  |  |
Effective yield | 2.834% |  |  | 2.834% |  |  |  |  |
Notes 3.60 Percent Due 2024 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Interest rate on notes | 3.60% | 3.60% | 3.60% | 3.60% |  |  | 3.60% |  |
Total unsecured long term debt | $ 750.0 | $ 750.0 | $ 750.0 | $ 953.0 |  |  | $ 968.0 |  |
Notes 3.10%, Due 2025 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Face amount of debt | $ 550.0 |  |  |  |  |  |  |  |
Interest rate on notes | 3.10% | 3.10% | 3.10% | 3.10% |  |  | 3.10% |  |
Total unsecured long term debt | $ 550.0 |  |  | $ 701.0 |  |  |  |  |
Additional information |  |  |  |  |  |  |  |  |
Debt instrument issue price | $ / shares | $ 99.949 |  |  |  |  |  |  |  |
Effective yield | 3.111% |  |  | 3.111% |  |  |  |  |
3.00% Series 5 Medium Term Notes, due 2026 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Interest rate on notes | 3.00% | 3.00% | 3.00% | 3.00% |  |  | 3.00% |  |
Total unsecured long term debt |  |  |  | $ 699.0 |  |  | $ 698.0 |  |
Debentures 7.875 Percent Due 2026 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Interest rate on notes | 7.875% | 7.875% | 7.875% | 7.875% |  |  | 7.875% |  |
Total unsecured long term debt | $ 275.0 | $ 275.0 | $ 275.0 | $ 364.0 |  |  | $ 372.0 |  |
Notes 8.20 Percent Due 2027 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Interest rate on notes | 8.20% | 8.20% | 8.20% | 8.20% |  |  | 8.20% |  |
Total unsecured long term debt | $ 59.0 |  |  | $ 79.0 |  |  | $ 82.0 |  |
Debentures 7.00 Percent Due 2028 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Interest rate on notes | 7.00% | 7.00% | 7.00% | 7.00% |  |  | 7.00% |  |
Total unsecured long term debt | $ 250.0 | $ 250.0 | $ 250.0 | $ 323.0 |  |  | $ 329.0 |  |
3.10% Series 6 Medium Term Notes, due 2029 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Interest rate on notes | 3.10% | 3.10% | 3.10% | 3.10% |  |  | 3.10% |  |
Total unsecured long term debt |  |  |  | $ 748.0 |  |  | $ 750.0 |  |
Additional information |  |  |  |  |  |  |  |  |
Senior unsecured notes issued |  |  |  |  |  |  | $ 750.0 |  |
Debt instrument issue price | $ / shares |  |  | $ 99.761 |  |  |  |  |  |
Effective yield |  | 3.128% | 3.128% |  |  |  | 3.128% |  |
5.00% Series 7 Medium Term Notes, Due 2030 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  | $ 1,250.0 |  |  |  |  |
Interest rate on notes | 5.00% | 5.00% | 5.00% | 5.00% |  |  | 5.00% |  |
Total unsecured long term debt |  |  |  | $ 1,247.0 |  |  |  |  |
Additional information |  |  |  |  |  |  |  |  |
Debt instrument issue price | $ / shares | $ 99.697 |  |  |  |  |  |  |  |
Effective yield | 5.039% |  |  | 5.039% |  |  |  |  |
Notes 7.15 Percent Due 2032 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Interest rate on notes | 7.15% | 7.15% | 7.15% | 7.15% |  |  | 7.15% |  |
Total unsecured long term debt | $ 500.0 | $ 500.0 | $ 500.0 | $ 637.0 |  |  | $ 647.0 |  |
Notes 5.35 Percent Due 2033 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Interest rate on notes | 5.35% | 5.35% | 5.35% | 5.35% |  |  | 5.35% |  |
Total unsecured long term debt | $ 300.0 | $ 300.0 | $ 300.0 | $ 356.0 |  |  | $ 361.0 |  |
Notes 5.95 Percent Due 2034 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Interest rate on notes | 5.95% | 5.95% | 5.95% | 5.95% |  |  | 5.95% |  |
Total unsecured long term debt | $ 500.0 | $ 500.0 | $ 500.0 | $ 636.0 |  |  | $ 646.0 |  |
Notes 5.95 Percent Due 2035 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Interest rate on notes | 5.95% | 5.95% | 5.95% | 5.95% |  |  | 5.95% |  |
Total unsecured long term debt | $ 600.0 | $ 600.0 | $ 600.0 | $ 736.0 |  |  | $ 747.0 |  |
5.39% Series 4 Medium Term Notes, due 2037 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Interest rate on notes | 5.39% | 5.39% | 5.39% | 5.39% |  |  | 5.39% |  |
Total unsecured long term debt |  |  |  | $ 599.0 |  |  | $ 599.0 |  |
Notes 6.50 Percent Due 2038 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Interest rate on notes | 6.50% | 6.50% | 6.50% | 6.50% |  |  | 6.50% |  |
Total unsecured long term debt | $ 1,150.0 | $ 1,150.0 | $ 1,150.0 | $ 1,464.0 |  |  | $ 1,487.0 |  |
Notes 6.80 Percent Due 2038 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Interest rate on notes | 6.80% | 6.80% | 6.80% | 6.80% |  |  | 6.80% |  |
Total unsecured long term debt | $ 900.0 | $ 900.0 | $ 900.0 | $ 1,167.0 |  |  | $ 1,186.0 |  |
Notes 6.85 Percent Due 2039 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Interest rate on notes | 6.85% | 6.85% | 6.85% | 6.85% |  |  | 6.85% |  |
Total unsecured long term debt | $ 750.0 | $ 750.0 | $ 750.0 | $ 953.0 |  |  | $ 969.0 |  |
Notes 6.00 Percent Due 2042 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Interest rate on notes | 6.00% | 6.00% | 6.00% | 6.00% |  |  | 6.00% |  |
Total unsecured long term debt | $ 152.0 |  |  | $ 149.0 |  |  | $ 150.0 |  |
Notes 4.00 Percent Due 2047 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Interest rate on notes | 4.00% | 4.00% | 4.00% | 4.00% |  |  | 4.00% |  |
Total unsecured long term debt | $ 750.0 | $ 750.0 | $ 750.0 | $ 952.0 |  |  | $ 967.0 |  |
4.34% Series 5 Medium Term Notes, due 2046 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Interest rate on notes | 4.34% | 4.34% | 4.34% | 4.34% |  |  | 4.34% |  |
Total unsecured long term debt |  |  |  | $ 300.0 |  |  | $ 300.0 |  |
Secured long-term debt |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  | $ 300.0 | $ 2.5 |  |  |

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

X
- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_7&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_BorrowingsInterestRate
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition The amount of current lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_CurrentLeaseLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The current portion of non-current borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_CurrentPortionOfLongtermBorrowings
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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_DisclosureOfDetailedInformationAboutBorrowingsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of interest recognised as a liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_InterestPayable
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_LeaseLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The non-current portion of non-current borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_LongtermBorrowings
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of non-current lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_NoncurrentLeaseLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of notes and debentures issued by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_NotesAndDebenturesIssued
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_NotionalAmount
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash outflow for repayments of non-current borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 17 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_17&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_RepaymentsOfNoncurrentBorrowings
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of current borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_ShorttermBorrowings
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the amount of commercial paper that is authorised to be issued. + References No definition available. + Details
Name: | su_CommercialPaperIssuanceAuthorized
Namespace Prefix: | su_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the issue term for commercial paper. + References No definition available. + Details
Name: | su_CommercialPaperTerm
Namespace Prefix: | su_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The current portion of non-current borrowings excluding current finance leases and current lease liabilities. + References No definition available. + Details
Name: | su_CurrentPortionOfLongtermBorrowingsExcludingCurrentFinanceLeasesAndCurrentLeaseLiabilities
Namespace Prefix: | su_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the issue price per instrument. + References No definition available. + Details
Name: | su_DebtInstrumentIssuePrice
Namespace Prefix: | su_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount of deferred financing costs. + References No definition available. + Details
Name: | su_DeferredFinancingCosts
Namespace Prefix: | su_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References No definition available. + Details
Name: | su_IfrsDebtInstrumentInterestRateEffectivePercentage
Namespace Prefix: | su_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the interest rate on lease liabilities. + References No definition available. + Details
Name: | su_LeaseLiabilitiesInterestRate
Namespace Prefix: | su_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of long-term borrowing, including current portion. + References No definition available. + Details
Name: | su_LongtermBorrowingsCurrentAndNoncurrent
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
- Definition The original amount that was scheduled to mature when the loan was originated. + References No definition available. + Details
Name: | su_LongtermBorrowingsOriginalMaturityAmount
Namespace Prefix: | su_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the revised coupon rate of the debt following a ratings downgrade by Moodys. + References No definition available. + Details
Name: | su_RevisedDebtCouponRateFollowingRatingsDowngrade
Namespace Prefix: | su_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Face amount of the subsidiary debt that was repurchased. + References No definition available. + Details
Name: | su_SubsidiaryDebtRepurchasedFaceValue
Namespace Prefix: | su_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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_BorrowingsByNameAxis=su_IfrsCommercialPaperMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_WeightedAverageMember
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: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=su_Notes7.75PercentDue2019Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=su_Notes3.10PercentSeries5MediumTermDue2021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=su_Debentures9.25PercentDue2021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=su_Notes9.40PercentDue2021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=su_Notes4.50PercentDue2022Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=su_Notes2.80Due2023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=su_Notes3.60PercentDue2024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=su_Notes3.10Due2025Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=su_Notes3.00PercentSeries5MediumTermDue2026Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=su_Debentures7.875PercentDue2026Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=su_Notes8.20PercentDue2027Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=su_Debentures7.00PercentDue2028Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=su_Notes3.10PercentSeries6MediumTermDue2029Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=su_Series7MediumTermNotes5.00Due2030Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=su_Notes7.15PercentDue2032Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=su_Notes5.35PercentDue2033Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=su_Notes5.95PercentDue2034Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=su_Notes5.95PercentDue2035Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=su_Notes5.39PercentSeries4MediumTermDue2037Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=su_Notes6.50PercentDue2038Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=su_Notes6.80PercentDue2038Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=su_Notes6.85PercentDue2039Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=su_Notes6PercentDue2042Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=su_Notes4.00PercentDue2047Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=su_Notes4.34PercentSeries5MediumTermDue2046Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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