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Simplification Transactions - Agreement Terms (Details) $ / shares in Units, shares in Millions, $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jul. 11, 2016 director $ / shares | Dec. 31, 2016 USD ($) $ / shares shares | Jun. 30, 2016
Simplification Transactions |  |  |
General partner ownership interest (as a percent) |  |  | 2.00%
AAP |  |  |
Simplification Transactions |  |  |
Estimated related party borrowings for true-up distribution if transactions not closed | $ |  | $ 41 |
Common Units | Cash Distributions | Second Quarter Distribution | Subsequent Event |  |  |
Simplification Transactions |  |  |
Quarterly level of distributions per common unit (in dollars per unit) | $ / shares | $ 0.70 |  |
Forecast | Common Units | Cash Distributions | Third Quarter Distribution |  |  |
Simplification Transactions |  |  |
Quarterly level of distributions per common unit (in dollars per unit) | $ / shares |  | $ 0.55 |
PAA | Indirect Ownership | AAP |  |  |
Simplification Transactions |  |  |
General partner ownership interest (as a percent) |  |  | 2.00%
PAGP |  |  |
Simplification Transactions |  |  |
Threshold of private general partner ownership below which shareholders are eligible to participate in general partner Board of Director elections (as a percent) |  |  | 40.00%
Simplification Agreement | Forecast | AAP |  |  |
Simplification Transactions |  |  |
Issuance of common units (in units) | shares |  | 245.5 |
Assumption of outstanding debt | $ |  | $ 593 |
Simplification Agreement | Forecast | PAA GP |  |  |
Simplification Transactions |  |  |
Economic general partner interest converted into non-economic interest (as a percent) |  | 2.00% |
Simplification Agreement | Forecast | PAGP | AAP |  |  |
Simplification Transactions |  |  |
Ratio of PAGP Class A shares to underlying PAA Common Units held by AAP |  | 1 |
Simplification Agreement | Exchange of AAP Class A Units and PAGP Class B Shares for PAGP Class A Shares | Subsequent Event |  |  |
Simplification Transactions |  |  |
Ratio for conversion or exchange of units | 1 |  |
Simplification Agreement | AAP | Subsequent Event | GP Holdings | Original Designating Parties |  |  |
Simplification Transactions |  |  |
Threshold ownership for interest holder to nominate a director to the related party Board of Directors (as a percent) | 10.00% |  |
Number of directors interest holder may designate to related party Board of Directors | director | 1 |  |

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