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Equity - Cash Distributions (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Incentive Distribution Made to Managing Member or General Partner [Line Items] |  |  |  |
General partner's distributions | $ 6 | $ 4 | $ 11 | $ 8
General partner's incentive distribution rights | 70 | 46 | 130 | 86
Total general partner's distributions | 76 | 50 | 141 | 94
Partners' distributions | 311 | 231 | 590 | 431
Limited Partners Common Units [Member] |  |  |  |
Incentive Distribution Made to Managing Member or General Partner [Line Items] |  |  |  |
Partners' distributions | 218 | 172 | 416 | 328
Preferred Units [Member] |  |  |  |
Incentive Distribution Made to Managing Member or General Partner [Line Items] |  |  |  |
Partners' distributions | $ 17 | $ 9 | $ 33 | $ 9

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- Definition Amount of cash or stock or unit payment to a limited liability corporation managing member or limited partnership general partner after the end of the accounting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 73 -URI http://asc.fasb.org/extlink&oid=6926462&loc=SL5163674-159010 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 72 -URI http://asc.fasb.org/extlink&oid=6926462&loc=SL5163672-159010 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 103 -URI http://asc.fasb.org/extlink&oid=65015998&loc=SL5199526-159011 + Details
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