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Partners' Capital and Distributions (Tables) | 3 Months Ended
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Mar. 31, 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 |
| 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 |
(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 three months of 2021 (in millions, except per unit data):
|  | Series A Preferred Unitholders
Distribution Payment Date |  | Cash Distribution |  |  | Distribution per Unit
May 14, 2021 (1) |  | $ | 37 |  |  |  | $ | 0.525 |
February 12, 2021 |  | $ | 37 |  |  |  | $ | 0.525 |
(1)Payable to unitholders of record at the close of business on April 30, 2021 for the period from January 1, 2021 through March 31, 2021. At March 31, 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 to be 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 (1) |  | $ | 24.5 |  |  |  | $ | 30.625 |
(1)Payable to unitholders of record at the close of business on May 3, 2021 for the period from November 15, 2020 through May 14, 2021.
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 three 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 |  |  |
May 14, 2021 (1) |  | $ | 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 April 30, 2021 for the period from January 1, 2021 through March 31, 2021.

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