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Partners' Capital and Distributions - Preferred Unit Distributions (Details) - USD ($) $ / shares in Units, $ in Millions | Nov. 15, 2023 | Nov. 14, 2023 | Aug. 15, 2023 | Aug. 14, 2023 | May 15, 2023 | Feb. 15, 2023 | Feb. 14, 2023 | Jan. 31, 2023 | Sep. 30, 2023 | Nov. 15, 2022
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Series A Preferred Units |  |  |  |  |  |  |  |  |  |
Partners Capital and Distribution |  |  |  |  |  |  |  |  |  |
Distribution rate reset, basis spread on variable rate (as a percent) |  |  |  |  |  |  |  | 5.85% |  |
Quarterly distributions per unit (usd per unit) |  |  |  |  |  |  |  | $ 0.615 |  |
Series A Preferred Units | Cash Distribution |  |  |  |  |  |  |  |  |  |
Partners Capital and Distribution |  |  |  |  |  |  |  |  |  |
Preferred distributions per unit (usd per unit) |  |  |  | $ 0.615 | $ 0.585 |  | $ 0.525 |  |  |
Preferred unit distribution amount |  |  |  | $ 44 | $ 42 |  | $ 37 |  |  |
Series A Preferred Units | Cash Distribution | Forecast |  |  |  |  |  |  |  |  |  |
Partners Capital and Distribution |  |  |  |  |  |  |  |  |  |
Preferred distributions per unit (usd per unit) |  | $ 0.615 |  |  |  |  |  |  |  |
Preferred unit distribution amount |  | $ 44 |  |  |  |  |  |  |  |
Series B Preferred Units |  |  |  |  |  |  |  |  |  |
Partners Capital and Distribution |  |  |  |  |  |  |  |  |  |
Preferred stock, liquidation preference (dollars per unit) |  |  |  |  |  |  |  |  |  | $ 1,000
Preferred unit, distribution percentage spread (as a percent) |  |  | 4.11% |  |  |  |  |  |  | 4.11%
Preferred unit, credit percentage spread (as a percent) |  |  | 0.26121% |  |  |  |  |  |  |
Series B Preferred Units | Cash Distribution |  |  |  |  |  |  |  |  |  |
Partners Capital and Distribution |  |  |  |  |  |  |  |  |  |
Preferred distributions per unit (usd per unit) |  |  | $ 24.10 |  | $ 22.18 | $ 22.27 |  |  |  |
Preferred unit distribution amount |  |  | $ 19 |  | $ 18 | $ 18 |  |  |  |
Series B Preferred Units | Cash Distribution | Other current liabilities |  |  |  |  |  |  |  |  |  |
Partners Capital and Distribution |  |  |  |  |  |  |  |  |  |
Amount accrued to distributions payable |  |  |  |  |  |  |  |  | $ 10 |
Series B Preferred Units | Cash Distribution | Forecast |  |  |  |  |  |  |  |  |  |
Partners Capital and Distribution |  |  |  |  |  |  |  |  |  |
Preferred distributions per unit (usd per unit) | $ 24.88 |  |  |  |  |  |  |  |  |
Preferred unit distribution amount | $ 20 |  |  |  |  |  |  |  |  |

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