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Capital Accounts, Redeemable Preferred Limited Partner Interests (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2020 | Dec. 31, 2021 | Sep. 30, 2020
Temporary Equity [Line Items] |  |  |  |  |  |
Series A cumulative convertible preferred units (in dollars per unit) |  |  |  |  |  | $ 1,000
Series A cumulative convertible preferred units, paid-in kind distribution (in units) | 275 |  |  |  |  |
Series A cumulative convertible preferred units outstanding (in units) | 50,687 | 50,412 | 50,412 |  | 50,412 | 50,000
Total distributions paid to convertible preferred unitholders | $ 4 |  |  |  |  |
Cash distributions paid to convertible preferred unitholders | $ 3 | $ 3 | $ 3 |  |  |
Preferred unit distribution rate | 7.25% |  |  |  |  |
Redemption price per preferred unit on or after September 30, 2025 at unitholder election (in dollars per unit) | $ 1,000 |  |  |  |  |
Redemption price per preferred unit from September 30, 2024 through September 29, 2025 (in dollars per unit) | 1,030 |  |  |  |  |
Redemption price per preferred unit from September 30, 2025 through September 29, 2026 (in dollars per unit) | 1,010 |  |  |  |  |
Redemption price per preferred unit on or after September 30, 2026 (in dollars per unit) | 1,000 |  |  |  |  |
Redemption price per preferred unit if Change of Control event occurs (in dollars per unit) | $ 1,010 |  |  |  |  |
Percentage applied to the common unit market price in calculating the number of common units to be acquired upon the conversion of series A preferred units to common units | 92.50% |  |  |  |  |
Percentage of preferred units that may be converted into common units at unitholder option | 50.00% |  |  |  |  |
Preferred Units [Member] |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |
Treasury units outstanding (preferred units) (in units) |  |  |  |  |  | 855,915
Common Units [Member] |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |
Treasury units acquired in connection with settlement of Liquidity Option in March 2020 (in units) |  |  |  | (54,807,352) |  |

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