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Partners' Capital and Distributions (Tables) | 3 Months Ended
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Mar. 31, 2018
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, 2017 | 69,696,542 |  |  | 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 LTIP | — |  |  | — |  |  | 17,766 |
Outstanding at March 31, 2018 | 71,090,468 |  |  | 800,000 |  |  | 725,206,904 |
| Limited Partners
| Series A Preferred Units |  | Common Units
Outstanding at December 31, 2016 | 64,388,853 |  |  | 669,194,419 |
Issuance of Series A preferred units in connection with in-kind distribution | 1,287,773 |  |  | — |
Sales of common units | — |  |  | 54,119,893 |
Issuances of common units under LTIP | — |  |  | 90,682 |
Outstanding at March 31, 2017 | 65,676,626 |  |  | 723,404,994 |
Common Units |
Limited Partners' Capital Account [Line Items] |
Schedule of cash distributions to common unitholders | The following table details distributions paid during or pertaining to the first three months of 2018 (in millions, except per unit data):
|  | Distributions |  |  | Cash Distribution per Common Unit
|  | Common Unitholders |  | Total Cash Distribution |  |
Distribution Payment Date |  | Public |  | AAP |  |  |
May 15, 2018 (1) |  | $ | 133 |  |  | $ | 85 |  |  | $ | 218 |  |  |  | $ | 0.30 |
February 14, 2018 |  | $ | 133 |  |  | $ | 85 |  |  | $ | 218 |  |  |  | $ | 0.30 |
(1) | Payable to unitholders of record at the close of business on May 1, 2018 for the period from January 1, 2018 through March 31, 2018.

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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