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Net Income Per Class A Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Basic Net Income per Class A Share |  |  |  |
Net income/(loss) attributable to PAGP from continuing operations | $ (74) | $ 10 | $ (26) | $ 56
Net income attributable to PAGP from discontinued operations | 463 | 20 | 434 | 58
Diluted Net Income/(Loss) per Class A Share: |  |  |  |
Incremental net income attributable to PAGP resulting from assumed exchange of AAP Management Units | 0 |  | 0 | 8
Net income attributable to PAGP from discontinued operations including incremental net income from assumed exchange of AAP Management Units | $ 463 | $ 20 | $ 434 | $ 66
Class A Shareholders |  |  |  |
Basic Net Income per Class A Share |  |  |  |
Basic weighted average Class A shared outstanding (in shares) | 198 | 198 | 198 | 198
Basic Net Income/(Loss) per Class A Share: |  |  |  |
Continuing operations, basic (usd per share) | $ (0.37) | $ 0.05 | $ (0.13) | $ 0.29
Discontinued operations, basic (usd per share) | 2.34 | 0.10 | 2.19 | 0.29
Basic Net Income per Class A Share (usd per share) | $ 1.97 | $ 0.15 | $ 2.06 | $ 0.58
Diluted Net Income/(Loss) per Class A Share: |  |  |  |
Dilutive shares resulting from assumed exchange of AAP Management Units | 0 |  | 0 | 35
Diluted weighted average Class A shares outstanding (in shares) | 198 | 198 | 198 | 233
Diluted Net Income/(Loss) per Class A Share: |  |  |  |
Continuing operations, diluted (usd per share) | $ (0.37) | $ 0.05 | $ (0.13) | $ 0.29
Discontinued operations, diluted (usd per share) | 2.34 | 0.10 | 2.19 | 0.28
Diluted net income per Class A Share (usd per share) | $ 1.97 | $ 0.15 | $ 2.06 | $ 0.57
Weighted Average | AAP Units | Held-for-Sale | NGL Business |  |  |  |
Basic and Diluted Net Income Per Common Unit [Line Items] |  |  |  |
Antidilutive securities excluded from computation of net income per common unit (in shares) | 35 | 35 | 35 | 35

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