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Partners' Capital and Distributions - Preferred Unit Distributions (Details) - USD ($) $ / shares in Units, $ in Millions | May 15, 2025 | Feb. 18, 2025 | Feb. 14, 2025 | Jan. 31, 2025 | Mar. 31, 2025 | Jan. 30, 2025
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Series A Preferred Units | Other current liabilities |  |  |  |  |  |
Partners' Capital and Distributions [Line Items] |  |  |  |  |  |
Amount accrued to distributions payable |  |  |  |  |  | $ 10
Series B Preferred Units | Other current liabilities |  |  |  |  |  |
Partners' Capital and Distributions [Line Items] |  |  |  |  |  |
Amount accrued to distributions payable |  |  |  |  | $ 9 |
Cash Distribution | Series A Preferred Units |  |  |  |  |  |
Partners' Capital and Distributions [Line Items] |  |  |  |  |  |
Cash Distribution |  |  | $ 36 | $ 10 |  |
Distribution per unit (usd per unit) |  |  | $ 0.615 |  |  |
Cash Distribution | Series A Preferred Units | Forecast |  |  |  |  |  |
Partners' Capital and Distributions [Line Items] |  |  |  |  |  |
Cash Distribution | $ 36 |  |  |  |  |
Distribution per unit (usd per unit) | $ 0.615 |  |  |  |  |
Cash Distribution | Series B Preferred Units |  |  |  |  |  |
Partners' Capital and Distributions [Line Items] |  |  |  |  |  |
Cash Distribution |  | $ 18 |  |  |  |
Distribution per unit (usd per unit) |  | $ 22.73 |  |  |  |
Cash Distribution | Series B Preferred Units | Forecast |  |  |  |  |  |
Partners' Capital and Distributions [Line Items] |  |  |  |  |  |
Cash Distribution | $ 17 |  |  |  |  |
Distribution per unit (usd per unit) | $ 21.49 |  |  |  |  |

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