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Related Party Transactions - Additional Information (Details) - shares |  |  | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2019
Agreement To Transport Crude Oil On Pipeline Of Equity Method Investee | Equity Method Investee |  |  |
Related Party Transaction [Line Items] |  |  |
Ownership interest in unconsolidated entity | 50.00% |  | 50.00%
PAGP | Shares Class C |  |  |
Related Party Transaction [Line Items] |  |  |
Ownership interest (in units) | 530,053,993 | 516,938,280 |
Minimum | AAP | Principal Owner |  |  |
Related Party Transaction [Line Items] |  |  |
Limited partner interest |  |  | 10.00%

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- Definition Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest, Units + References No definition available. + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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- Definition Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP). + References 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 + Details
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