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Partners' Capital and Distributions - Preferred Unit Distributions (Details) - USD ($) $ / shares in Units, $ in Millions	Nov. 17, 2025	Nov. 14, 2025	Aug. 15, 2025	Aug. 14, 2025	May 15, 2025	Feb. 18, 2025	Feb. 14, 2025	Sep. 30, 2025	Jan. 30, 2025
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	$ 36		$ 36
Distribution per unit (usd per unit)				$ 0.615	$ 0.615		$ 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		$ 17	$ 18
Distribution per unit (usd per unit)			$ 22.23		$ 21.49	$ 22.73
Cash Distribution | Series B Preferred Units | Forecast
Partners' Capital and Distributions [Line Items]
Cash Distribution	$ 18
Distribution per unit (usd per unit)	$ 21.93

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