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Partners' Capital and Distributions - Subsidiary Sales of Common Units (Details) - USD ($) shares in Millions, $ in Millions | 1 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2017 | Jun. 30, 2017
Partners Capital and Distributions |  |
Sale of common units, net proceeds |  | $ 1,535
PAA |  |
Partners Capital and Distributions |  |
Noncontrolling interests in subsidiaries (percent) |  | 64.00%
AAP |  |
Partners Capital and Distributions |  |
Noncontrolling interests in subsidiaries (percent) |  | 47.00%
SLC Pipeline LLC |  |
Partners Capital and Distributions |  |
Noncontrolling interests in subsidiaries (percent) |  | 25.00%
PAA | Continuous Offering Program | Common Units |  |
Partners Capital and Distributions |  |
Sale of common units (units) |  | 4.0
Sale of common units, net proceeds |  | $ 129
Commissions paid to sales agents |  | $ 1
Omnibus Agreement | PAA | Continuous Offering Program | Common Units |  |
Partners Capital and Distributions |  |
Sale of common units (units) |  | 1.8
Omnibus Agreement | PAA | Underwritten Offering | Common Units |  |
Partners Capital and Distributions |  |
Sale of common units (units) | 48.3 |

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