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Partners' Capital and Distributions - Issuance of Series B Preferred Units (Details) - Series B Preferred Units - USD ($) $ / shares in Units, $ in Millions | Nov. 15, 2017 | Oct. 10, 2017 | Nov. 15, 2022
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Forecast |  |  |
Class of Stock [Line Items] |  |  |
Percentage spread on top of LIBOR for distribution |  |  | 4.11%
Initial prorated distribution per unit (in dollars per unit) | $ 5.9549 |  |
Total distribution amount | $ 5 |  |
Redemption price per unit |  |  | $ 1,000
Subsequent event |  |  |
Class of Stock [Line Items] |  |  |
Units issued (in units) |  | 800,000 |
Price per unit issued (in dollars per unit) |  | $ 1,000 |
Proceeds from issuance of units |  | $ 788 |
Liquidation preference (in dollars per unit) |  | $ 1,000 |
Distribution rate percentage |  | 6.125% |
Distribution rate per unit |  | $ 61.25 |
Redemption price per unit |  | $ 1,020 |
Redemption price percentage |  | 102.00% |

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