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Partners' Capital and Distributions - Distributions (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 6 Months Ended
--- | --- | --- | --- | ---
Aug. 14, 2018 | May 15, 2018 | Feb. 14, 2018 | Jun. 30, 2017
Partners Capital and Distribution [Line Items] |  |  |  |
Total distributions paid |  |  |  | $ 771
Common Units | Cash Distribution |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |
Total distributions paid |  | $ 218 | $ 218 |
Distributions per common unit, paid (usd per unit) |  | $ 0.30 | $ 0.30 |
Common Units | Cash Distribution | Forecast |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |
Total distributions paid | $ 218 |  |  |
Distributions per common unit, paid (usd per unit) | $ 0.30 |  |  |
Public | Common Units | Cash Distribution |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |
Distributions to common unitholders |  | $ 133 | $ 133 |
Public | Common Units | Cash Distribution | Forecast |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |
Distributions to common unitholders | $ 133 |  |  |
AAP | Common Units | Cash Distribution |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |
Distributions to common unitholders |  | $ 85 | $ 85 |
AAP | Common Units | Cash Distribution | Forecast |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |
Distributions to common unitholders | $ 85 |  |  |

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