XML 12 R3.htm IDEA: XBRL DOCUMENT
v3.20.2

Consolidated Balance Sheets (Parenthetical) - shares | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Common Units [Member] |  |
Equity: |  |
Limited Partners' Capital Account, Units Issued | 83,040,781 |
Limited Partners' Capital Account, Units Outstanding | 83,040,781 | 82,985,941
Class C Units [Member] |  |
Equity: |  |
Limited Partners' Capital Account, Units Issued | 16,410,780 | 16,410,780
Limited Partners' Capital Account, Units Outstanding | 16,410,780 | 16,410,780

X
- Definition The number of limited partner units issued. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB Topic 4.F) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187171-122770 + Details
Name: | us-gaap_LimitedPartnersCapitalAccountUnitsIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of limited partner units outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB Topic 4.F) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187171-122770 + Details
Name: | us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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

X
- Details
Name: | us-gaap_LimitedPartnersCapitalAccountByClassAxis=sun_CommonUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LimitedPartnersCapitalAccountByClassAxis=sun_ClassCUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |