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Net Income/(Loss) Per Class A Share (Tables)
 12 Months Ended
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,
202020192018
Basic Net Income/(Loss) per Class A Share
Net income/(loss) attributable to PAGP$(568)$331 $334 
Basic weighted average Class A shares outstanding186 168 158 
Basic net income/(loss) per Class A share$(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