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Revenues and Accounts Receivable - Narrative (Details) | Jun. 30, 2026 | Dec. 31, 2025
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Revenue from Contract with Customer [Abstract] |  |
Substantially all trade accounts receivable, net, maximum age of balances past their invoice date | 30 days | 30 days

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- Definition The maximum number of days past their invoice date for substantially all of the trade accounts receivable. + References No definition available. + Details
Name: | pagp_TradeAccountsReceivableNetDisclosureOfMaximumAgeOfBalancesPastInvoiceDate
Namespace Prefix: | pagp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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