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Inventory, Linefill and Long-term Inventory - Components of Inventory, Linefill and Long-term Inventory (Details) bbl in Thousands, $ in Millions | Dec. 31, 2024 USD ($) $ / bbl bbl | Dec. 31, 2023 USD ($) $ / bbl bbl
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Inventory disclosures |  |
Inventory subtotal, Carrying Value | $ 439 | $ 548
Linefill subtotal, Carrying Value | 968 | 976
Long-term inventory subtotal, Carrying Value | 280 | 265
Total | $ 1,687 | $ 1,789
Crude oil |  |
Inventory disclosures |  |
Inventory, Volumes (in barrels) | bbl | 3,911 | 5,877
Linefill, Volumes (in barrels) | bbl | 15,521 | 15,409
Long-term inventory, Volumes (in barrels) | bbl | 3,424 | 3,256
Inventory subtotal, Carrying Value | $ 259 | $ 383
Linefill subtotal, Carrying Value | 906 | 909
Long-term inventory subtotal, Carrying Value | $ 239 | $ 232
Inventory (Price/Unit of measure) (in dollars per unit) | $ / bbl | 66.22 | 65.17
Linefill (Price/Unit of measure) (in dollars per unit) | $ / bbl | 58.37 | 58.99
Long-term inventory (Price/Unit of measure) (in dollars per unit) | $ / bbl | 69.80 | 71.25
NGL |  |
Inventory disclosures |  |
Inventory, Volumes (in barrels) | bbl | 6,985 | 5,957
Linefill, Volumes (in barrels) | bbl | 2,259 | 2,168
Long-term inventory, Volumes (in barrels) | bbl | 1,355 | 1,326
Inventory subtotal, Carrying Value | $ 166 | $ 154
Linefill subtotal, Carrying Value | 62 | 67
Long-term inventory subtotal, Carrying Value | $ 41 | $ 33
Inventory (Price/Unit of measure) (in dollars per unit) | $ / bbl | 23.77 | 25.85
Linefill (Price/Unit of measure) (in dollars per unit) | $ / bbl | 27.45 | 30.90
Long-term inventory (Price/Unit of measure) (in dollars per unit) | $ / bbl | 30.26 | 24.89
Other |  |
Inventory disclosures |  |
Inventory subtotal, Carrying Value | $ 14 | $ 11

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- Definition This element represents the aggregate of current and non-current inventory, including linefill and base gas. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition The volume of current inventory as of the balance sheet date. + References No definition available. + Details
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- Definition Inventory Volumes Linefill + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- Definition The volume of noncurrent inventory as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | pagp_
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Balance Type: | na
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- Definition The weighted-average price per unit of current inventory. + References No definition available. + Details
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- Definition Inventory, Weighted Average Price Per Unit, Linefill + References No definition available. + Details
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- Definition The weighted-average price per unit of noncurrent inventory. + References No definition available. + Details
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- Definition Linefill + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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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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- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 852 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481372/852-10-55-10 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483467/210-10-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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- Definition Inventories not expected to be converted to cash, sold or exchanged within the normal operating cycle. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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- Details
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- Details
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- Details
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