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Net Income/(Loss) Per Class A Share (Tables) | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Calculation of basic and diluted net income per Class A share | The following table sets forth the computation of basic and diluted net income/(loss) per Class A share (in millions, except per share data):
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
Basic Net Income/(Loss) per Class A Share |  |  |  |  |
Net income/(loss) attributable to PAGP | $ | (568) |  |  | $ | 331 |  |  | $ | 334 |
Basic weighted average Class A shares outstanding | 186 |  |  | 168 |  |  | 158 |
Basic net income/(loss) per Class A share | $ | (3.06) |  |  | $ | 1.97 |  |  | $ | 2.12 |
Diluted Net Income/(Loss) per Class A Share |  |  |  |  |
Net income/(loss) attributable to PAGP | $ | (568) |  |  | $ | 331 |  |  | $ | 334 |
Incremental net income/(loss) attributable to PAGP resulting from assumed exchange of AAP units and AAP Management Units | (189) |  |  | 2 |  |  | 262 |
Net income/(loss) attributable to PAGP including incremental net income/(loss) from assumed exchange of AAP units and AAP Management Units | $ | (757) |  |  | $ | 333 |  |  | $ | 596 |
Basic weighted average Class A shares outstanding | 186 |  |  | 168 |  |  | 158 |
Dilutive shares resulting from assumed exchange of AAP units and AAP Management Units | 60 |  |  | 2 |  |  | 124 |
Diluted weighted average Class A shares outstanding | 246 |  |  | 170 |  |  | 282 |
Diluted net income/(loss) per Class A share | $ | (3.07) |  |  | $ | 1.96 |  |  | $ | 2.11 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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