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Partners' Capital and Distributions (Tables) | 3 Months Ended
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Mar. 31, 2017
Partners' Capital Notes [Abstract] |
Schedule of activity for Series A preferred units and common units | The following tables present the activity for our Series A preferred units and common units:
| Limited Partners
| Preferred Units |  | Common Units
Outstanding at December 31, 2016 | 64,388,853 |  |  | 669,194,419 |
Issuance of Series A preferred units in connection with in-kind distributions | 1,287,773 |  |  | — |
Sales of common units | — |  |  | 54,119,893 |
Issuance of common units under LTIP | — |  |  | 90,682 |
Outstanding at March 31, 2017 | 65,676,626 |  |  | 723,404,994 |
| Limited Partners
| Preferred Units |  | Common Units
Outstanding at December 31, 2015 | — |  |  | 397,727,624 |
Sale of Series A preferred units | 61,030,127 |  |  | — |
Issuance of common units under LTIP | — |  |  | 3,367 |
Outstanding at March 31, 2016 | 61,030,127 |  |  | 397,730,991 |
Schedule of sale of common units | The following table summarizes our sales of common units during the three months ended March 31, 2017 (net proceeds in millions):
Type of Offering |  | Common Units Issued |  | Net Proceeds (1) |
Continuous Offering Program |  | 4,033,567 |  |  | $ | 129 |  | (2 | )
Omnibus Agreement (3) |  | 50,086,326 |  | (4 | ) | 1,535 |  |
|  | 54,119,893 |  |  | $ | 1,664 |  |
(1) Amounts are net of costs associated with the offerings.
(2) | We pay commissions to our sales agents in connection with common units issuances under our Continuous Offering Program. We paid $1 million of such commissions during the three months ended March 31, 2017.
(3) | Pursuant to the Omnibus Agreement entered into by the Plains Entities in connection with the Simplification Transactions, PAGP has agreed to use the net proceeds from any public or private offering and sale of Class A shares, after deducting the sales agents’ commissions and offering expenses, to purchase from AAP a number of AAP units equal to the number of Class A shares sold in such offering at a price equal to the net proceeds from such offering. The Omnibus Agreement also provides that immediately following such purchase and sale, AAP will use the net proceeds it receives from such sale of AAP units to purchase from us an equivalent number of our common units.
(4) | Includes (i) approximately 1.8 million common units issued to AAP in connection with PAGP’s issuance of Class A shares under its Continuous Offering Program and (ii) 48.3 million common units issued to AAP in connection with PAGP’s March 2017 underwritten offering.
Schedule of cash distributions to common unitholders | The following table details the distributions paid in cash during or pertaining to the first three months of 2017 (in millions, except per unit data):
|  | Distributions |  |  | Cash Distribution per Common Unit
|  | Common Unitholders |  | Total Cash Distribution |  |
Distribution Payment Date |  | Public |  | AAP |  |  |
May 15, 2017 (1) |  | $ | 240 |  |  | $ | 159 |  |  | $ | 399 |  |  |  | $ | 0.55 |
February 14, 2017 |  | $ | 237 |  |  | $ | 134 |  |  | $ | 371 |  |  |  | $ | 0.55 |
(1) | Payable to unitholders of record at the close of business on May 1, 2017 for the period January 1, 2017 through March 31, 2017.

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