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Segment Information - Reconciliation of Segment Adjusted EBITDA (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Segment Adjusted EBITDA $ 2,756 $ 2,685 $ 2,504
Total other segment items 60 90 425
Unallocated general and administrative expenses (387) (356) (330)
Depreciation and amortization (1,026) (1,051) (968)
Gains/(losses) on asset sales, asset impairments and other, net (160) 152 (269)
Gain on investments in unconsolidated entities, net (Note 7, Note 8) 15 28 346
Interest expense, net (382) (386) (405)
Other income/(expense), net 17 102 (219)
INCOME BEFORE TAX 1,274 1,614 1,409
Income tax expense (204) (189) (246)
Net income 1,070 1,425 1,163
Net income attributable to noncontrolling interests (967) (1,227) (995)
Net income attributable to PAGP 103 198 168
Segment Reporting, Reconciling Item, Corporate Nonsegment      
Segment Reporting Information [Line Items]      
Unallocated general and administrative expenses $ (6) $ (6) $ (5)