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Partners' Capital and Distributions - Subsidiary 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 | $ 860
AAP |  |  |  |  |
Partners Capital and Distributions |  |  |  |  |
Distributions to noncontrolling interests |  | $ 75 | $ 77 |  |
Distributions to PAGP |  | 84 | 57 |  |
Total distributions paid |  | 159 | 134 |  |
SLC Pipeline LLC |  |  |  |  |
Partners Capital and Distributions |  |  |  |  |
Distributions to noncontrolling interests |  |  |  | $ 1 |
Class A Shares |  |  |  |  |
Partners Capital and Distributions |  |  |  |  |
Distributions to limited partners |  | $ 84 | $ 57 |  |
Distributions per common unit, paid |  | $ 0.55 | $ 0.55 |  |
PAA | Common Units | Cash Distributions |  |  |  |  |
Partners Capital and Distributions |  |  |  |  |
Total distributions paid |  | $ 399 | $ 371 |  |
Distributions per common unit, paid |  | $ 0.55 | $ 0.55 |  |
PAA | Series A Preferred Units | In-Kind Distributions |  |  |  |  |
Partners Capital and Distributions |  |  |  |  |
Distributions to limited partners |  | $ 34 | $ 34 |  |
Distribution of units in lieu of cash (units) |  | 1,313,527 | 1,287,773 |  |
Forecast | AAP |  |  |  |  |
Partners Capital and Distributions |  |  |  |  |
Distributions to noncontrolling interests | $ 75 |  |  |  |
Distributions to PAGP | 84 |  |  |  |
Total distributions paid | 159 |  |  |  |
Forecast | Class A Shares |  |  |  |  |
Partners Capital and Distributions |  |  |  |  |
Distributions to limited partners | $ 84 |  |  |  |
Distributions per common unit, paid | $ 0.55 |  |  |  |
Forecast | PAA | Common Units | Cash Distributions |  |  |  |  |
Partners Capital and Distributions |  |  |  |  |
Total distributions paid | $ 399 |  |  |  |
Distributions per common unit, paid | $ 0.55 |  |  |  |
Forecast | PAA | Series A Preferred Units | In-Kind Distributions |  |  |  |  |
Partners Capital and Distributions |  |  |  |  |
Distributions to limited partners | $ 35 |  |  |  |
Distribution of units in lieu of cash (units) | 1,339,796 |  |  |  |
Public | PAA | Common Units | Cash Distributions |  |  |  |  |
Partners Capital and Distributions |  |  |  |  |
Distributions to limited partners |  | $ 240 | $ 237 |  |
Public | Forecast | PAA | Common Units | Cash Distributions |  |  |  |  |
Partners Capital and Distributions |  |  |  |  |
Distributions to limited partners | $ 240 |  |  |  |
AAP | PAA | Common Units | Cash Distributions |  |  |  |  |
Partners Capital and Distributions |  |  |  |  |
Distributions to limited partners |  | $ 159 | $ 134 |  |
AAP | Forecast | PAA | Common Units | Cash Distributions |  |  |  |  |
Partners Capital and Distributions |  |  |  |  |
Distributions to limited partners | $ 159 |  |  |  |

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