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Partners' Capital and Distributions - Equity Offerings (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Partners Capital and Distributions |  |  |
Issuance of units (in units) | 26,278,288 | 22,133,904 |
Issuance of units, net proceeds | $ 805 | $ 1,121 |
General partners' proportionate capital contributions | 42 | 23 | $ 18
Continuous and Underwritten Offerings | General Partner |  |  |
Partners Capital and Distributions |  |  |
General partners' proportionate capital contributions | 9 | $ 22 | $ 18
Continuous Offering Program |  |  |
Partners Capital and Distributions |  |  |
Issuance of units (in units) |  | 1,133,904 | 15,375,810
Issuance of units, net proceeds |  | $ 59 | $ 866
Commissions to sales agents | $ 8 | $ 1 | $ 9
Underwritten Offering |  |  |
Partners Capital and Distributions |  |  |
Issuance of units (in units) |  | 21,000,000 |
Issuance of units, net proceeds |  | $ 1,062 |

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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 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB Topic 4.F) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 + Details
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