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DEBT AND CREDIT FACILITIES - Credit Facilities- (Details) - CAD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of detailed information about borrowings [line items] |  |
Total credit facilities | $ 8,328 |
Total unutilized credit facilities | 889 |
Available credit facilities for liquidity purposes | 4,701 | $ 3,608
Fully revolving and expires in 2023 |  |
Disclosure of detailed information about borrowings [line items] |  |
Total credit facilities | 3,500 |
Fully revolving and expires in 2022 |  |
Disclosure of detailed information about borrowings [line items] |  |
Total credit facilities | 3,241 |
Fully revolving and expires in 2021 |  |
Disclosure of detailed information about borrowings [line items] |  |
Total credit facilities | 1,455 |
Can be terminated at any time at the option of the lenders |  |
Disclosure of detailed information about borrowings [line items] |  |
Total credit facilities | 132 |
Credit facilities supporting outstanding commercial paper |  |
Disclosure of detailed information about borrowings [line items] |  |
Credit facilities assigned | (2,155) |
Credit facilities supporting standby letters of credit |  |
Disclosure of detailed information about borrowings [line items] |  |
Credit facilities assigned | (1,284) |
Cash collateral | $ 206 | $ 108

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- 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
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- Definition The amount of undrawn borrowing facilities that may be available for future operating activities and to settle capital commitments. [Refer: Capital commitments] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 50 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_50_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Represents the amount of cash provided towards collateral for credit facilities. + References No definition available. + Details
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Balance Type: | debit
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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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- Definition Represents the portion of line of credit facilities that are assigned for specific purposes. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition The amount of undrawn borrowing facilities for liquidity purposes that may be available for future operating activities and to settle capital commitments. + References No definition available. + Details
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Period Type: | instant

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- Details
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- Details
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- Details
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- Details
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Period Type: |