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Net Income/(Loss) Per Class A Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Basic and Diluted Net Income/(Loss) per Class A Share |  |
Net income/(loss) attributable to PAGP | $ (581) | $ 147
AAP Units |  |
Net Income Per Class A Share |  |
Antidilutive securities excluded from the computation of net income/(loss per Class A share | 63.0 | 120.0
AAP Management Units |  |
Net Income Per Class A Share |  |
Antidilutive securities excluded from the computation of net income/(loss per Class A share | 1.0 | 2.0
Class A Shares |  |
Basic and Diluted Net Income/(Loss) per Class A Share |  |
Basic and diluted weighted average Class A shares outstanding (in shares) | 183.0 | 159.0
Basic and diluted net income/(loss) per Class A share (in dollars per share) | $ (3.18) | $ 0.92
Maximum |  |
Net Income Per Class A Share |  |
Dilutive LTIP awards (shares) |  | 0.1

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e1337-109256 + Details
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