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Partners' Capital and Distributions | 3 Months Ended
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Mar. 31, 2021
Partners' Capital Notes [Abstract] |
Partners' Capital and Distributions | Partners’ Capital and Distributions Units Outstanding 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. Distributions Series A Preferred Unit 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 Unit Distributions. Distributions on our Series B preferred units are payable semi-annually in arrears on the 15th day of May and November. 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. At March 31, 2021, approximately $18 million of accrued distributions payable to our Series B preferred unitholders was included in “Other current liabilities” on our Condensed Consolidated Balance Sheet. Common Unit 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. Noncontrolling Interests in Subsidiaries During the three months ended March 31, 2021, we paid distributions of $6 million to noncontrolling interests in Red River Pipeline Company LLC.

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- Definition The entire disclosure for the formation, structure, control and ownership of the partnership. Disclosures related to accounts comprising partners' capital. Includes balances of general partners' capital account, limited partners' capital account, preferred partners' capital account and total partners' capital account and units outstanding; accumulated other comprehensive income; amount and nature of changes to amount of partner's capital and units outstanding by class, rights and privileges for each class of units; distribution policies and distributions paid by unit class; impact of and correction of an error in previously issued financial statements; limitations of partners' liability; redemption, conversion and distribution policies; and deferred compensation related to the issuance of units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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