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Partners' Capital and Distributions (Tables)
6 Months Ended
Jun. 30, 2021
Limited Partners' Capital Account [Line Items]  
Schedule of activity for preferred units and common units
The following tables present the activity for our preferred and common units:

 Limited Partners
 Series A Preferred UnitsSeries B Preferred UnitsCommon Units
Outstanding at December 31, 202071,090,468 800,000 722,380,416 
Repurchase and cancellation of common units under Common Equity Repurchase Program (1)
— — (350,000)
Issuances of common units under equity-indexed compensation plans— — 25,431 
Outstanding at March 31, 202171,090,468 800,000 722,055,847 
Repurchase and cancellation of common units under Common Equity Repurchase Program— — (4,940,592)
Issuances of common units under equity-indexed compensation plans
— — 256,321 
Outstanding at June 30, 202171,090,468 800,000 717,371,576 
 
 Limited Partners
 Series A
Preferred Units
Series B
Preferred Units
Common Units
Outstanding at December 31, 201971,090,468 800,000 728,028,576 
Issuances of common units under equity-indexed compensation plans— — 24,431 
Outstanding at March 31, 202071,090,468 800,000 728,053,007 
Issuances of common units under equity-indexed compensation plans— — 47,391 
Outstanding at June 30, 202071,090,468 800,000 728,100,398 
(1)Trades for these units were executed in late December 2020, but settled in early January 2021.
Series A Preferred Units  
Limited Partners' Capital Account [Line Items]  
Schedule of distributions The following table details distributions to our Series A preferred unitholders paid during or pertaining to the first six months of 2021 (in millions, except per unit data):
Series A Preferred Unitholders
Distribution Payment DateCash DistributionDistribution per Unit
August 13, 2021 (1)
$37 $0.525 
May 14, 2021$37 $0.525 
February 12, 2021$37 $0.525 
(1)Payable to unitholders of record at the close of business on July 30, 2021 for the period from April 1, 2021 through June 30, 2021. At June 30, 2021, such amount was accrued as distributions payable in “Other current liabilities” on our Condensed Consolidated Balance Sheet.
Series B Preferred Units  
Limited Partners' Capital Account [Line Items]  
Schedule of distributions The following table details distributions paid to our Series B preferred unitholders (in millions, except per unit data):
Series B Preferred Unitholders
Distribution Payment DateCash Distribution Distribution per Unit
May 17, 2021$24.5 $30.625 
Common Units  
Limited Partners' Capital Account [Line Items]  
Schedule of distributions The following table details distributions to our common unitholders paid during or pertaining to the first six months of 2021 (in millions, except per unit data):
DistributionsCash Distribution per Common Unit
Common UnitholdersTotal Cash Distribution
Distribution Payment DatePublicAAP
August 13, 2021 (1)
$85 $44 $129 $0.18 
May 14, 2021$86 $44 $130 $0.18 
February 12, 2021$86 $44 $130 $0.18 
(1)Payable to unitholders of record at the close of business on July 30, 2021 for the period from April 1, 2021 through June 30, 2021.