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Partners' Capital and Distributions (Tables) | 6 Months Ended
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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 Units |  | Series B Preferred Units |  | Common Units
Outstanding at December 31, 2020 | 71,090,468 |  |  | 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, 2021 | 71,090,468 |  |  | 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, 2021 | 71,090,468 |  |  | 800,000 |  |  | 717,371,576 |
| Limited Partners
| Series A Preferred Units |  | Series B Preferred Units |  | Common Units
Outstanding at December 31, 2019 | 71,090,468 |  |  | 800,000 |  |  | 728,028,576 |
Issuances of common units under equity-indexed compensation plans | — |  |  | — |  |  | 24,431 |
Outstanding at March 31, 2020 | 71,090,468 |  |  | 800,000 |  |  | 728,053,007 |
Issuances of common units under equity-indexed compensation plans | — |  |  | — |  |  | 47,391 |
Outstanding at June 30, 2020 | 71,090,468 |  |  | 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 Date |  | Cash Distribution |  |  | Distribution 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 Date |  | Cash 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):
|  | Distributions |  |  | Cash Distribution per Common Unit
|  | Common Unitholders |  | Total Cash Distribution |  |
Distribution Payment Date |  | Public |  | AAP |  |  |
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.

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