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Partners' Capital and Distributions - Distributions (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 6 Months Ended
--- | --- | --- | --- | ---
Aug. 14, 2017 | May 15, 2017 | Feb. 14, 2017 | Jun. 30, 2017 | Jun. 30, 2016
Partners Capital and Distributions |  |  |  |  |
Total distributions paid |  |  |  | $ 771 | $ 868
Partners’ Capital Excluding Noncontrolling Interests |  |  |  |  |
Partners Capital and Distributions |  |  |  |  |
Total distributions paid |  |  |  | $ 770 | $ 866
Common Units | Cash Distributions |  |  |  |  |
Partners Capital and Distributions |  |  |  |  |
Total distributions paid |  | $ 399 | $ 371 |  |
Distributions per common unit, paid (usd per unit) |  | $ 0.55 | $ 0.55 |  |
Common Units | Cash Distributions | Forecast |  |  |  |  |
Partners Capital and Distributions |  |  |  |  |
Total distributions paid | $ 399 |  |  |  |
Distributions per common unit, paid (usd per unit) | $ 0.55 |  |  |  |
Series A Preferred Units | Partners’ Capital Excluding Noncontrolling Interests | In-Kind Distributions |  |  |  |  |
Partners Capital and Distributions |  |  |  |  |
Distributions to unitholders |  | $ 34 | $ 34 |  |
Distribution of units in lieu of cash (units) |  | 1,313,527 | 1,287,773 |  |
Series A Preferred Units | Partners’ Capital Excluding Noncontrolling Interests | In-Kind Distributions | Forecast |  |  |  |  |
Partners Capital and Distributions |  |  |  |  |
Distributions to unitholders | $ 35 |  |  |  |
Distribution of units in lieu of cash (units) | 1,339,796 |  |  |  |
Public | Common Units | Cash Distributions |  |  |  |  |
Partners Capital and Distributions |  |  |  |  |
Distributions to unitholders |  | $ 240 | $ 237 |  |
Public | Common Units | Cash Distributions | Forecast |  |  |  |  |
Partners Capital and Distributions |  |  |  |  |
Distributions to unitholders | $ 240 |  |  |  |
AAP | Common Units | Cash Distributions |  |  |  |  |
Partners Capital and Distributions |  |  |  |  |
Distributions to unitholders |  | $ 159 | $ 134 |  |
AAP | Common Units | Cash Distributions | Forecast |  |  |  |  |
Partners Capital and Distributions |  |  |  |  |
Distributions to unitholders | $ 159 |  |  |  |

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