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Partners' Capital and Distributions - Exchange Rights and Shares Activity (Details) - shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Class A Shares
Activity for Class A shares, Class B shares and Class C shares
Balance, beginning of period (shares)	194,051,436	182,138,592
Exchange Right exercises (shares)	46,879	2,101,487
Balance, end of period (shares)	194,098,315	184,240,079
Class B Shares
Activity for Class A shares, Class B shares and Class C shares
Balance, beginning of period (shares)	50,640,192	65,785,702
Conversion of AAP Management Units (shares)	414,608	559,768
Exchange Right exercises (shares)	(46,879)	(2,101,487)
Redemption Right exercises (shares)	(229,931)	(1,206,599)
Balance, end of period (shares)	50,777,990	63,037,384
Class C Shares
Activity for Class A shares, Class B shares and Class C shares
Balance, beginning of period (shares)	547,717,762	549,538,139
Redemption Right exercises (shares)	229,931	1,206,599
Repurchase of common units by a subsidiary under Common Equity Repurchase Program (shares)	(350,000)
Other (shares)	25,431	24,431
Balance, end of period (shares)	547,623,124	550,769,169

X

- Definition

Represents the number of shares issued (exchanged) in connection with Exchange Right exercises.

+ References

No definition available.

+ Details

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Namespace Prefix:	pagp_
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Balance Type:	na
Period Type:	duration

X

- Definition

Limited Partners Capital Account, Shares Issued (Redeemed) in Redemption Right Exercises

+ References

No definition available.

+ Details

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X

- Definition

Limited Partners Capital Shares Issued From Conversion

+ References

No definition available.

+ Details

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Namespace Prefix:	pagp_
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X

- Definition

Partners' Capital Account, Shares, Cancellation Of Shares

+ References

No definition available.

+ Details

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Namespace Prefix:	pagp_
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Balance Type:	na
Period Type:	duration

X

- Definition

Changes in the number of units outstanding included in the statement of changes in partners' capital which are not separately disclosed or provided for elsewhere in the taxonomy.

+ References

No definition available.

+ Details

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

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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X

- Definition

The number of limited partner units outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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=120397183&loc=d3e187171-122770

+ Details

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- Details

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- Details

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- Details

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