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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - shares | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
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Class A Shares |  |  |  |  |  |
Shares outstanding |  |  |  |  |  |
Shares outstanding (shares) | 184,260,178 | 184,240,079 | 182,138,592 | 166,817,333 | 159,485,588 | 159,485,588

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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

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