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Revenues and Accounts Receivable - Narrative (Details) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
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 Trade Accounts Receivable Net Disclosure of Maximum Age of Balances Past Invoice Date + References No definition available. + Details
Name: | pagp_TradeAccountsReceivableNetDisclosureOfMaximumAgeOfBalancesPastInvoiceDate
Namespace Prefix: | pagp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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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