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Net Income Per Class A Share | 6 Months Ended
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Jun. 30, 2017
Earnings Per Share [Abstract] |
Net Income Per Class A Share | Net Income Per Class A Share Basic net income per Class A share is determined by dividing net income attributable to PAGP by the weighted-average number of Class A shares outstanding during the period. Class B shares do not share in the earnings of the Partnership. Accordingly, basic and diluted net income per Class B share has not been presented. Diluted net income per Class A share is determined by dividing net income attributable to PAGP by the diluted weighted-average number of Class A shares outstanding during the period. For purposes of calculating diluted net income per Class A share, both the net income attributable to PAGP and the diluted weighted-average number of Class A shares outstanding consider the impact of possible future exchanges of (i) AAP units and the associated Class B shares into our Class A shares and (ii) certain Class B units of AAP (referred to herein as “AAP Management Units”) into our Class A shares. In addition, the calculation of the diluted weighted-average number of Class A shares outstanding considers the effect of potentially dilutive awards under the Plains GP Holdings, L.P. Long-Term Incentive Plan (the “PAGP LTIP”). All AAP Management Units that have satisfied the applicable performance conditions are considered potentially dilutive. Exchanges of potentially dilutive AAP units and AAP Management Units are assumed to have occurred at the beginning of the period and the incremental income attributable to PAGP resulting from the assumed exchanges is representative of the incremental income that would have been attributable to PAGP if the assumed exchanges occurred on that date. See Note 9 for information regarding exchanges of AAP units and AAP Management Units. PAGP LTIP awards that are deemed to be dilutive are reduced by a hypothetical share repurchase based on the remaining unamortized fair value, as prescribed by the treasury stock method in guidance issued by the FASB. For the three and six months ended June 30, 2017, the possible exchange of any AAP units and certain AAP Management Units would not have had a dilutive effect on basic net income per Class A share. For the three months ended June 30, 2016, the possible exchange of any AAP units would have had a dilutive effect on basic net income per Class A share and the possible exchange of certain AAP Management Units would not have had a dilutive effect on basic net income per Class A share. For the six month ended June 30, 2016, the possible exchange of any AAP units and certain AAP Management Units would have had a dilutive effect on basic net income per Class A share. For the three and six months ended June 30, 2017 and 2016, our PAGP LTIP awards were dilutive; however, there were less than 0.1 million dilutive LTIP awards for each period, which did not change the presentation of weighted average Class A shares outstanding or net income per Class A share. The following table sets forth the computation of basic and diluted net income per Class A share (in millions, except per share data):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Basic Net Income per Class A Share |  |  |  |  |  |  |  |  |  |  |
Net income attributable to PAGP | $ | 24 |  |  | $ | 42 |  |  | $ | 65 |  |  | $ | 78 |
Basic weighted average Class A shares outstanding | 153 |  |  | 100 |  |  | 136 |  |  | 98 |
Basic net income per Class A share | $ | 0.16 |  |  | $ | 0.41 |  |  | $ | 0.47 |  |  | $ | 0.80 |
Diluted Net Income per Class A Share |  |  |  |  |  |  |  |  |  |  |
Net income attributable to PAGP | $ | 24 |  |  | $ | 42 |  |  | $ | 65 |  |  | $ | 78 |
Incremental net income attributable to PAGP resulting from assumed exchange of AAP units and AAP Management Units | — |  |  | 52 |  |  | — |  |  | 111 |
Net income attributable to PAGP including incremental net income from assumed exchange of AAP units and AAP Management Units | $ | 24 |  |  | $ | 94 |  |  | $ | 65 |  |  | $ | 189 |
Basic weighted average Class A shares outstanding | 153 |  |  | 100 |  |  | 136 |  |  | 98 |
Dilutive shares resulting from assumed exchange of AAP units and AAP Management Units | — |  |  | 134 |  |  | — |  |  | 147 |
Diluted weighted average Class A shares outstanding | 153 |  |  | 234 |  |  | 136 |  |  | 245 |
Diluted net income per Class A share | $ | 0.16 |  |  | $ | 0.40 |  |  | $ | 0.47 |  |  | $ | 0.77 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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