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Related Party Transactions - Narrative (Details) $ in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 28, 2025 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Feb. 28, 2025 CAD ($) | Dec. 31, 2024 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Investments in related party notes |  |  |  | $ 330 |  |  |
Proceeds from the issuance of related party notes |  |  |  | 330 |  |  |
Related party interest expense |  | $ 133 | $ 111 | 260 | $ 205 |  |
PAGP | Notes Due In June 2035 at 5.75 Percent | General Partner |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Related party note receivable | $ 330 |  |  |  |  | $ 473 |
Related party note payable | $ 330 |  |  |  |  | $ 473 |
Related party note payable and receivable interest rate (as a percent) | 5.75% |  |  |  |  |  |
Investments in related party notes | $ 330 |  |  |  |  |  |
Proceeds from the issuance of related party notes | $ 330 |  |  |  |  |  |
PAGP | Related Party Promissory Notes | General Partner |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Related party note receivable |  | 1,349 |  | 1,349 |  |  | $ 948
Related party note payable |  | 1,349 |  | 1,349 |  |  | 948
Related party interest receivable |  | 32 |  | 32 |  |  | 27
Related party interest payable |  | 32 |  | 32 |  |  | $ 27
Related party interest expense |  | 23 | 7 | 43 | 15 |  |
Related party interest income |  | $ 23 | $ 7 | $ 43 | $ 15 |  |

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