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Related Party Transactions - Promissory Notes with our General Partner (Details) $ in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 19 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2024 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) | Jul. 31, 2024 CAD ($) | Dec. 31, 2023 USD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2023 CAD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from the issuance of related party notes |  |  |  | $ 629 |  |  |  |  |  |
Investments in related party notes |  |  |  | 629 |  |  |  |  |  |
Related party interest expense |  | $ 113 | $ 97 | 318 | $ 290 |  |  |  |  |
PAGP | Related Party Promissory Notes | General Partner |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Related party note receivable |  | 1,011 |  | 1,011 |  | $ 1,011 |  | $ 379 |  |
Related party note payable |  | 1,011 |  | 1,011 |  | 1,011 |  | 379 |  |
Related party interest receivable |  | 11 |  | 11 |  | 11 |  | 10 |  |
Related party interest payable |  | 11 |  | 11 |  | $ 11 |  | $ 10 |  |
Related party interest income |  | 16 | 8 | 31 | 18 |  |  |  |  |
Related party interest expense |  | $ 16 | $ 8 | $ 31 | $ 18 |  |  |  |  |
PAGP | 8.25% note due April 2027 | General Partner |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Related party note receivable |  |  |  |  |  |  |  |  | $ 370 | $ 500
Related party note payable |  |  |  |  |  |  |  |  | $ 370 | $ 500
Related party note payable and receivable interest rate (as a percent) |  |  |  |  |  | 8.25% |  |  |  |
PAGP | 6.50% note due September 2034 | General Partner |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Related party note receivable | $ 629 |  |  |  |  |  | $ 865 |  |  |
Related party note payable | 629 |  |  |  |  |  | $ 865 |  |  |
Related party note payable and receivable interest rate (as a percent) |  | 6.50% |  |  |  |  |  |  |  |
Proceeds from the issuance of related party notes | 629 |  |  |  |  |  |  |  |  |
Investments in related party notes | $ 629 |  |  |  |  |  |  |  |  |

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