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Partners' Capital and Distributions (Details 2) - USD ($) shares in Millions, $ in Millions | 1 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2015 | Sep. 30, 2015 | Sep. 30, 2014
Partners Capital and Distribution |  |  |
Issuance of common units, net proceeds |  | $ 1,121 | $ 669
SLC Pipeline LLC |  |  |
Partners Capital and Distribution |  |  |
Noncontrolling interests in subsidiaries (as a percent) |  | 25.00% |
Continuous Offering Program |  |  |
Partners Capital and Distribution |  |  |
Issuance of common units (in units) |  | 1.1 |
Issuance of common units, net proceeds |  | $ 59 |
Contribution from general partner |  | 1 |
Commissions to sales agents |  | $ 1 |
Underwritten Offering |  |  |
Partners Capital and Distribution |  |  |
Issuance of common units (in units) | 21.0 |  |
Issuance of common units, net proceeds | $ 1,100 |  |
Contribution from general partner | $ 21 |  |

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- Definition Total change in each class of partners' capital accounts during the year due to the sale of units. All partners include general, limited and preferred partners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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