Related Party Transactions - Additional Information (Details) - shares	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
PAGP \| Class C Shares \| PAA
Related Party Transaction [Line Items]
Class C shares held by PAA (in shares)	534,596,831	547,717,762
AAP \| Principal Owner \| Minimum
Related Party Transaction [Line Items]
Limited partner interest percentage	10.00%

Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

Name:	us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration