Revenues and Accounts Receivable - Narrative (Details)	6 Months Ended	12 Months Ended
Jun. 30, 2023	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Substantially all trade accounts receivable, net, maximum age of balances past their invoice date	30 days	30 days

The maximum number of days past their invoice date for substantially all of the trade accounts receivable.

No definition available.

Name:	pagp_TradeAccountsReceivableNetDisclosureOfMaximumAgeOfBalancesPastInvoiceDate
Namespace Prefix:	pagp_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration