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Partners' Capital and Distributions (Tables)
 12 Months Ended
Dec. 31, 2019
Partners Capital and Distribution [Line Items]  
Activity for preferred and common units
The following table presents the activity for our preferred and common units:

Limited Partners
Series A
Preferred Units
Series B
Preferred Units		Common Units
Outstanding at December 31, 201664,388,853  —  669,194,419  
Issuances of Series A preferred units in connection with in-kind distributions
5,307,689  —  —  
Sale of Series B preferred units—  800,000  —  
Sales of common units—  —  54,119,893  
Issuance of common units in connection with acquisition of interest in Advantage Joint Venture (Note 7)
—  —  1,252,269  
Issuances of common units under equity-indexed compensation plans
—  —  622,557  
Outstanding at December 31, 201769,696,542  800,000  725,189,138  
Issuance of Series A preferred units in connection with in-kind distribution
1,393,926  —  —  
Issuances of common units under equity-indexed compensation plans
—  —  1,172,786  
Outstanding at December 31, 201871,090,468  800,000  726,361,924  
Issuances of common units under equity-indexed compensation plans
—  —  1,666,652  
Outstanding at December 31, 201971,090,468  800,000  728,028,576  
Issuance of common units The following table summarizes our sales of common units during year ended December 31, 2017 (net proceeds in millions):
YearType of OfferingCommon Units Issued
Net Proceeds (1)
2017Continuous Offering Program4,033,567  $129  
(2)
2017
Omnibus Agreement (3)
50,086,326  
(4)
1,535  
2017 Total54,119,893  $1,664  

(1)Amounts are net of costs associated with the offerings.
(2)We paid $1 million to sales agents in connection with common unit issuances under our Continuous Offering Program during the year ended December 31, 2017.
(3)Pursuant to the Omnibus Agreement entered into on November 15, 2016 by the Plains Entities, PAGP used the net proceeds from the sale of PAGP 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 PAGP Class A shares sold in such offering at a price equal to the net proceeds from such offering. Also pursuant to the Omnibus Agreement, immediately following such purchase and sale, AAP used the net proceeds it received 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 distributions paid
The following table details distributions paid to common unitholders during the year presented (in millions, except per unit data):

Distributions Paid
Distributions per
common unit
YearPublicAAPTotal
2019$632  $372  $1,004  $1.38  
2018$532  $339  $871  $1.20  
2017$849  $537  $1,386  $1.95  
Series A Preferred Units  
Partners Capital and Distribution [Line Items]  
Schedule of distributions paid
The following table details distributions paid to our preferred unitholders during the year presented (in millions, except unit data):
Series A Preferred UnitholdersSeries B Preferred Unitholders
Distribution (1)
Cash
Distribution (2)
YearCashUnits
2019$149  —  $49  
2018$112  1,393,926  $49  
2017$—  5,307,689  $5  

(1) We elected to pay distributions on our Series A preferred units in additional Series A preferred units for each quarterly distribution from their issuance through the February 2018 distribution. Distributions on our Series A preferred units have been paid in cash since the May 2018 distribution. During 2018 and 2017, we issued additional Series A preferred units in lieu of cash distributions of $37 million and $139 million, respectively.
(2) We paid a pro-rated initial distribution on the Series B preferred units on November 15, 2017 to holders of record at the close of business on November 1, 2017 in an amount equal to approximately $5.9549 per unit.
Series B Preferred Units  
Partners Capital and Distribution [Line Items]  
Schedule of distributions paid
The following table details distributions paid to our preferred unitholders during the year presented (in millions, except unit data):
Series A Preferred UnitholdersSeries B Preferred Unitholders
Distribution (1)
Cash
Distribution (2)
YearCashUnits
2019$149  —  $49  
2018$112  1,393,926  $49  
2017$—  5,307,689  $5  

(1) We elected to pay distributions on our Series A preferred units in additional Series A preferred units for each quarterly distribution from their issuance through the February 2018 distribution. Distributions on our Series A preferred units have been paid in cash since the May 2018 distribution. During 2018 and 2017, we issued additional Series A preferred units in lieu of cash distributions of $37 million and $139 million, respectively.
(2) We paid a pro-rated initial distribution on the Series B preferred units on November 15, 2017 to holders of record at the close of business on November 1, 2017 in an amount equal to approximately $5.9549 per unit.