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Related Party Transactions - Promissory Notes with our General Partner (Details) $ in Millions, $ in Millions | 3 Months Ended | 13 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2024 USD ($) | Mar. 31, 2024 CAD ($) | Dec. 31, 2023 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |
Related party interest expense | $ 95 | $ 98 |  |  |
8.25% note due April 2027 | PAGP | General Partner |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party note receivable | 369 |  | $ 369 | $ 500 | $ 379
Related party note payable | 369 |  | $ 369 | $ 500 | 379
Related party note payable and receivable interest rate (as a percent) |  |  | 8.25% |  |
Related party interest receivable | 3 |  | $ 3 |  | 10
Related party interest payable | 3 |  | $ 3 |  | $ 10
Related party interest income | 8 | 3 |  |  |
Related party interest expense | $ 8 | $ 3 |  |  |

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