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Net Income Per Class A Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Basic and Diluted Net Income per Class A Share
Net income attributable to PAGP	$ 16	$ 1	$ 45	$ 3
Basic and diluted weighted average Class A shares outstanding	136		136
Basic and diluted net income per Class A share (in dollars per share)	$ 0.12		$ 0.33
Class A Shares
Basic and Diluted Net Income per Class A Share
Net income attributable to PAGP	$ 16		$ 45
Basic and diluted weighted average Class A shares outstanding	136		136
Basic and diluted net income per Class A share (in dollars per share)	$ 0.12		$ 0.33
Class A Shares | Maximum
Basic and Diluted Net Income per Class A Share
Dilutive LTIP awards (in shares)	0.1		0.1

X

- 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.

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- Definition

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

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