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Partners' Capital and Distributions (Details 2)	6 Months Ended
	Jun. 30, 2014
Class B Shares
Partners Capital and Distribution
Balance, beginning of period (in shares)	472,196,136
Shares exchanged in connection with Exchange Right exercises	(2,213,000)
Balance, end of period (in shares)	469,983,136
Class A Shares
Partners Capital and Distribution
Balance, beginning of period (in shares)	133,833,637
Shares issued in connection with Exchange Right exercises	2,213,000
Balance, end of period (in shares)	136,046,637
Class A Shares | AAP units
Partners Capital and Distribution
AAP unit conversion ratio to Class A shares	1

X

- Definition

Represents the number of shares issued in connection with share and unit exchanges.

+ References

No definition available.

+ Details

Name:	pagp_LimitedPartnersCapitalAccountSharesIssuedInExchange
Namespace Prefix:	pagp_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of units or shares exchanged for another class of shares of the reporting entity.

+ References

No definition available.

+ Details

Name:	pagp_LimitedPartnersCapitalAccountUnitsOrSharesExchanged
Namespace Prefix:	pagp_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	pagp_PartnersCapitalAndDistributionLineItems
Namespace Prefix:	pagp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of Class A shares that will be issued in exchange for each AAP unit, when exchanged in conjunction with an equal number of Class B shares and general partner units.

+ References

No definition available.

+ Details

Name:	pagp_UnitExchangeRatio
Namespace Prefix:	pagp_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of limited partner units outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 272

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 5

-Subparagraph (SAB TOPIC 4.F)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 4

-Section F

+ Details

Name:	us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant