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Partners' Capital and Distributions - Equity Offerings (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Partners Capital and Distributions |  |  |  |
Issuance of units, net proceeds |  | $ 1,664 | $ 805 | $ 1,121
General partners' proportionate capital contributions |  |  | 42 | 23
Continuous and Underwritten Offerings | General Partner |  |  |  |
Partners Capital and Distributions |  |  |  |
General partners' proportionate capital contributions |  |  | 9 | 22
Continuous Offering Program |  |  |  |
Partners Capital and Distributions |  |  |  |
Commissions to sales agents |  | $ 1 | $ 8 | $ 1
Common Units |  |  |  |
Partners Capital and Distributions |  |  |  |
Issuance of units (in units) |  | 54,119,893 |  | 22,133,904
Issuance of units, net proceeds |  | $ 1,664 |  | $ 1,121
Common Units | Continuous Offering Program |  |  |  |
Partners Capital and Distributions |  |  |  |
Issuance of units (in units) |  | 4,033,567 | 26,278,288 | 1,133,904
Issuance of units, net proceeds |  | $ 129 | $ 805 | $ 59
Common Units | Omnibus Agreement |  |  |  |
Partners Capital and Distributions |  |  |  |
Issuance of units (in units) |  | 50,086,326 |  |
Issuance of units, net proceeds |  | $ 1,535 |  |
Common Units | Underwritten Offering |  |  |  |
Partners Capital and Distributions |  |  |  |
Issuance of units (in units) |  |  |  | 21,000,000
Issuance of units, net proceeds |  |  |  | $ 1,062
Omnibus Agreement | AAP | Common Units | Continuous Offering Program |  |  |  |
Partners Capital and Distributions |  |  |  |
Issuance of units (in units) |  | 1,800,000 |  |
Omnibus Agreement | AAP | Common Units | Underwritten Offering |  |  |  |
Partners Capital and Distributions |  |  |  |
Issuance of units (in units) | 48,300,000 | 48,300,000 |  |

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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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